Nazia Rahman - Academia.edu (original) (raw)

Papers by Nazia Rahman

Applied Chemical Engineering

Tea is a highly common beverage worldwide. In addition to other particles, it contains a range of... more Tea is a highly common beverage worldwide. In addition to other particles, it contains a range of minerals and trace elements. Even though many are necessary for humans, some could be hazardous. Scientists have long been interested in the toxicity of trace metals and how they affect human health. By using Flame Atomic Absorption Spectrophotometer, the amounts of Ni, Cu, Cd, Zn, Pb, Cr, and Mn in eight black tea leaves, five green tea leaves, and their infusions were examined. The tea samples were collected from Bangladeshi local markets. The infusion time in boiling water was 5 and 10 minutes. Results revealed that the concentration ranges of Ni, Cu, Cd, Zn, Pb, Cr and Mn in black and green tea leaves and their infusions of 5 minutes and 10 minutes were 1.82 to 41.32, 13.54 to 29.87, 0.48 to 2.16, 0.30 to 36.52, 0.04 to 3.89, 0.00 to 4.95 and 112.67 to 187.98 ppm respectively. Concentrations of the elements found in samples were compared with maximum values reported by World Health ...

International Journal of Polymer Science, 2016

Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room tempera... more Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room temperature (27 ∘ C) by applying 5, 10, 15, 20, and 25 kGy of gamma radiation to 15% AAc aqueous solutions containing 5, 7.5, and 15% of starch. With increment of the radiation dose, gel fraction became higher and attained the maximum (96.5%) at 15 kGy, above which the fraction got lowered. On the other hand, the gel fraction monotonically increased with the starch content. Swelling ratios were lower for the starch/AAc hydrogels prepared with higher gamma-ray doses and so with larger starch contents. Significant promotions of the swelling ratios were demonstrated by hydrolysis with NaOH: 13632 ± 10% for 15 kGy radiation-dosed [5% starch/15% AAc] hydrogel, while the maximum swelling ratio was ∼200% for those without the treatment. The authors further investigated the availability of the starch/AAc hydrogel as an adsorbent recovering dye waste from the industrial effluents by adopting methylene blue as a model material; the hydrogels showed high dye-capturing coefficients which increase with the starch ratio. The optimum dye adsorption was found to be 576 mg per g of the hydrogel having 7.5 starch and 15% AAc composition. Two kinetic models, (i) pseudo-first-order and (ii) pseudo-second-order kinetic models, were applied to test the experimental data. The latter provided the best correlation of the experimental data compared to the pseudo-first-order model.

Journal of Polymers and The Environment, Mar 17, 2017

An iminodiacetate (IDA) group containing nonwoven polyethylene (PE) film was prepared by radiatio... more An iminodiacetate (IDA) group containing nonwoven polyethylene (PE) film was prepared by radiation induced graft polymerization of an epoxy group containing monomer, glycidyl methacrylate (GMA) onto nonwoven PE fabric and subsequent chemical modification to IDA group. The effect of solvents (water, methanol, ethanol, isopropyl alcohol and dimethyl sulfoxide) on modification of epoxy group of GMA grafted PE (GMA-g-PE) fabric to IDA group was investigated. Ethanol provided a higher density of IDA group on GMA-g-PE fabric. Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and dynamic mechanical analysis of IDA-GMA-PE adsorbent, GMA-g-PE fabric and pure PE fabric were studied. The ability of resultant IDA adsorbent to absorb chromium from aqueous medium was evaluated by batch method. The parameters such as feeding chromium concentration, pH of chromium solution and adsorption time of IDA adsorbent were discussed. The obtained results illustrate that the IDA adsorbent could be fruitful to absorb chromium from water. The equilibrium experimental data for the adsorption of chromium on IDA adsorbent fitted Langmuir isotherm model.

In the present study alginate-starch blend films (thickness 0.08 mm) of different composition wer... more In the present study alginate-starch blend films (thickness 0.08 mm) of different composition were prepared by casting and their mechanical properties were studied. Highest tensile strength was obtained for alginate: starch = 4: 1 of 70 MPa. To impart antimicrobial property to the alginate-starch films, citric acid of different composition was used and CaCl2 treatment of this film was performed to improve the stability of the films in water. Then the films were further modified with monomer, methylacrylate (MA) and gamma radiation. The blend films were soaked in different formulations of methylacrylate (MA), in methanol and then irradiated by gamma radiation. Mechanical properties of the modified films such as tensile strength and elongation at break were studied. Thermal properties of films were characterized by dynamic mechanical analysis (DMA). The structural and morphological features of films were investigated using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM).

Fabrication of Starch-Acrylic acid-Acrylamide hydrogel were accomplished by the use of gamma rays... more Fabrication of Starch-Acrylic acid-Acrylamide hydrogel were accomplished by the use of gamma rays from Co-60 source at room temperature. The adsorbent were characterized by IR. The prepared absorbent was utilized for absorption of uranium (VI) from aqueous solution. To investigate the effect of adsorption conditions on absorption capacity of the adsorption experiment were executed at changed contact time, pH, temperature and concentration of uranium (VI) solution. Absorption by the absorbent attains the equilibrium value after 5 hours. pH 3.7 was found optimum considering the highest absorption capacity. The absorption capacity shows highest value at 1000 ppm U(VI) concentration. The absorption capacity achieved under most favorable condition was 166.84 mg/g. Isotherm and kinetic models were used to interpret the U(VI) adsorption mechanism on the hydrogel. Results of desorption of U(VI) ions and reuse of the absorbent are hopeful. From the study it can be said that the starch-acrylic acid-acrylamide hydrogel absorbent have potential for uranium (VI) removal from contaminated water.

Journal of Thermodynamics & Catalysis, 2022

In this study, a new amidoxime adsorbent based on waste Polypropylene (PP) fabric was prepared fo... more In this study, a new amidoxime adsorbent based on waste Polypropylene (PP) fabric was prepared for the adsorption of aqueous Cr (VI) metal ions. The pre-irradiation technique was used for grafting Acrylonitrile (AN) onto PP fabric. The grafting reaction was carried out at 80˚C in a water bath for 4 hours, utilizing H 2 SO 4 as an additive using 60% AN concentration and a 30 kGy radiation dose. The amidoxime adsorbent was produced by treating Acrylonitrile grafted Polypropylene (AN-g-PP) with NH 2 OH.HCl and characterized by FTIR, SEM, TGA, and DMA. The adsorption of Cr (VI) was investigated under various contact time, pH, temperature, and metal ion concentration circumstances. Both the Langmuir and Freundlich isotherm models were used to fit the equilibrium adsorption data. The kinetic data follows the pseudo-first-order model, and the estimated and experimental sorption capacities are in good agreement. The thermodynamic data showed that the sorption process was endothermic and spontaneous, taking place by increasing the randomness of the system. Furthermore, the study of the desorption of Cr (VI) from the adsorbent surface and reuse of the adsorbent indicates that the adsorbent can be applied effectively for the efficient removal of Cr (VI) ions from aqueous solutions.

Analytical Chemistry: An Indian Journal, 2022

In the present research work, γ-ray initiated grafting of Glycidyl Methacrylate (GMA) on non-wove... more In the present research work, γ-ray initiated grafting of Glycidyl Methacrylate (GMA) on non-woven polyethylene fabrics was followed by amine functionalization. Dependence of amination yield on degree of grafting was investigated. Extensive examinations on the adsorption of anionic dye Methyl Orange (MO) from aqueous solution by the functionalized GMA-g-non woven PE fabrics were conducted. Influence of variation of adsorption environment likely contact time, temperature, pH and initial metal ion concentration on MO adsorption aptitude was experimented. The optimal condition that provided maximum MO adsorption was identified to be contact time 48 h, initial metal concentration 500 ppm, pH 1.759 and temperature 80ºC. To understand the equilibrium between MO and the absorbent system Langmuir isotherm model was considered. Good fitting with Langmuir isotherm model suggested that MO adsorption was restricted to one molecular layer and the highest monolayer adsorption capacity calculated was 60.60 mg/g. The adsorption kinetics was analyzed using pseudo-first-order and pseudo-second-order models. The adsorption of MO was successfully inferred with pseudosecond-order model. The bonding between different groups and the surface morphology of the adsorbent was explored by FTIR ad SEM Analysis. Successful desorption of MO followed by reuse of the regenerated adsorbent fabric revealed the future prospect of the reusable adsorbent.

Journal of Polymer Engineering, 2022

This study focuses on the adsorption of hazardous Cr (III) and Cu (II) ions from aqueous solution... more This study focuses on the adsorption of hazardous Cr (III) and Cu (II) ions from aqueous solution by applying modified waste polypropylene (PP) fabric as an adsorbent. Pre-irradiation technique was performed for grafting of sodium styrene sulfonate (SSS) and acrylic acid (AAc) onto the PP fabric. The monomer containing 8% SSS and 16% AAc in water was used. Graft yield at 30 kGy radiation dose was 390% when 4% NaCl was added as additive. The prepared adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA) and dynamic mechanical analyzer (DMA). The influences of different parameters including pH, contact time, temperature and initial metal ion concentration were also investigated. The equilibrium adsorption data were better fitted to the Langmuir isotherm model with maximum monolayer adsorption capacity 384.62 mg/g for Cr (III) and 188.68 mg/g for Cu (II) ions. The kinetic data were better exp...

Environmental Research and Technology, 2021

In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-wove... more In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-woven polyethylene fabric using pre-irradiation method and the grafted adsorbent is employed for Cr(III) and Pb(II) adsorption. After irradiation of the non-woven polyethylene fabrics with 50 kGy radiation dose the grafting reaction was carried out at 80º C with monomer solution consisted of 30% AAc, 10% SSS and 4% NaCl in water. A high graft yield of 270% was achieved. Fourier Transform Infrared, Scanning Electron Microscopy and Thermo-gravimetric Analysis were used to analyze the adsorbent. Pb (II) and Cr (III) adsorption from synthetic aqueous solution was attempted by the grafted adsorbent. Adsorption study was accomplished by changing the contact time, pH and initial metal ion concentration. Contact time 48 h and initial metal concentration 1000 ppm were found optimum for all the metal ions studied. pH 6.2 and 5 was observed best for Pb (II) and Cr(III) adsorption respectively. Kinetic adsorption data fitted better with pseudo-second-order equation than pseudo-first-order. Good correlation of experimental data with Langmuir isotherm model suggested monolayer adsorption. Langmuir equation showed that the maximum adsorption capacity for Pb (II) was 38.46 mg g-1 and Cr (III) was 111.11 mg g-1. Experiment on desorption of metal ions and reuse of the adsorbent depicted good results. Adsorbent also showed efficient adsorption of Cr(III) from real waste water. From all the findings it can be expected that the AAc-SSS grafted PE fabric can successfully eliminate Cr(III) and Pb(II) from industrial waste water.

A novel, regenerative and biodegradable acrylic acid hydrogel having different chitosan compositi... more A novel, regenerative and biodegradable acrylic acid hydrogel having different chitosan composition (w = 0, 0.5, 1.0 and 1.5 %) was constructed using gamma radiation from the Cobalt-60 source. The prepared hydrogel was treated with alkali to enhance its dye adsorption capacity. Uptake capability of the hydrogel at different chitosan percentage, contact time, pH, and methylene blue (MB) concentrations was measured using UV Spectrometer. MB uptake ability obtained was found to escalate proportionately with escalating chitosan percentage and alkali treatment. Kinetics and isotherm of MB adsorption mechanism were analyzed. Pseudosecond- order model and Langmuir isotherm model were followed by the Hydrogel MB uptake capacity. The adsorption efficiency of monolayer saturation of the alkali-treated adsorbent was 322 mg/g as obtained from Langmuir equation. Desorption and reuses of the hydrogel were successfully carried out. The results indicated that acrylic acid-chitosan hydrogel is feasi...

Fundamentals of Natural Fibres and Textiles, 2021

International Journal of Polymer Science, 2016

Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room tempera... more Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room temperature (27 ∘ C) by applying 5, 10, 15, 20, and 25 kGy of gamma radiation to 15% AAc aqueous solutions containing 5, 7.5, and 15% of starch. With increment of the radiation dose, gel fraction became higher and attained the maximum (96.5%) at 15 kGy, above which the fraction got lowered. On the other hand, the gel fraction monotonically increased with the starch content. Swelling ratios were lower for the starch/AAc hydrogels prepared with higher gamma-ray doses and so with larger starch contents. Significant promotions of the swelling ratios were demonstrated by hydrolysis with NaOH: 13632 ± 10% for 15 kGy radiation-dosed [5% starch/15% AAc] hydrogel, while the maximum swelling ratio was ∼200% for those without the treatment. The authors further investigated the availability of the starch/AAc hydrogel as an adsorbent recovering dye waste from the industrial effluents by adopting methylene blue as a model material; the hydrogels showed high dye-capturing coefficients which increase with the starch ratio. The optimum dye adsorption was found to be 576 mg per g of the hydrogel having 7.5 starch and 15% AAc composition. Two kinetic models, (i) pseudo-first-order and (ii) pseudo-second-order kinetic models, were applied to test the experimental data. The latter provided the best correlation of the experimental data compared to the pseudo-first-order model.

In this study, a new amidoximated adsorbent based on waste polypropylene (PP) fabric was prepared... more In this study, a new amidoximated adsorbent based on waste polypropylene (PP) fabric was prepared for the adsorption of aqueous Cr (VI) metal ions. Pre-irradiation technique was employed for grafting of acrylonitrile (AN) on PP fabric. The grafting reaction was carried out at 80oC in a water bath for 4 hours utilizing sulfuric acid (2% of AN) as additive and the percentage of grafting obtained was 150% using 60% AN concentration and 30 kGy radiation dose. The amidoximated adsorbent was produced by treating acrylonitrile (AN) grafted PP (AN-g-PP) with NH2OH.HCl and characterized by FTIR, SEM, TGA and DMA. The removal of Cr (VI) was examined under several conditions such as contact time, pH, temperature, initial Cr (VI) concentration. The equilibrium adsorption data were fitted to both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the adsorbent was found to be 232.56 mg/g calculated from Langmuir equation. Kinetic studies have exhibited that the highest r...

American Journal of Polymer Science and Technology

An environmental affable, economically feasible and reusable sulfonated adsorbent were constructe... more An environmental affable, economically feasible and reusable sulfonated adsorbent were constructed by gamma radiation grafting of glycidyl methacrylate (GMA) on non-woven polyethylene fabric and subsequent chemical modification. Highest graft yield of 343.31% was obtained at favourable conditions: 30 kGy radiation dose, 5% monomer concentration, adding up of 0.5% Tween-20 as an additive, 4 h reaction time. The epoxide group containing GMA-g-PE film were functionalized through sulfonation. The adsorbent was identified by Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and Thermo-gravimetric Analysis (TGA). The aqueous solutions of methylene blue were prepared in various concentrations and adsorption behavior by the developed sulfonated-GMA-g-PE film were investigated. MB uptake capacity at different environment such as contact time, pH and initial MB concentration were identified. The adsorption of MB is highly pH dependent and utmost sorption was found at pH 7. The kinetic adsorption data were interpreted by pseudo-first-order and pseudo-second-order equations. Pseudo-first-order rate kinetic model is more applicable for the sorption process due to its higher correlation coefficient. From the two isotherm model Langmuir and Fruendlich, Fruendlich model attuned best with the MB sorption as presented by higher correlation coefficient. The MB uptake capacity of the sorbent obtained from Langmuir model was 500 mg/g. Futhermore, the adsorbent could be reformed and reused repeatedly for the sorption of MB from waste water.

Environmental Research and Technology, 2021

In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-wove... more In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-woven polyethylene fabric using pre-irradiation method and the grafted adsorbent is employed for Cr(III) and Pb(II) adsorption. After irradiation of the non-woven polyethylene fabrics with 50 kGy radiation dose the grafting reaction was carried out at 80º C with monomer solution consisted of 30% AAc, 10% SSS and 4% NaCl in water. A high graft yield of 270% was achieved. Fourier Transform Infrared, Scanning Electron Microscopy and Thermo-gravimetric Analysis were used to analyze the adsorbent. Pb (II) and Cr (III) adsorption from synthetic aqueous solution was attempted by the grafted adsorbent. Adsorption study was accomplished by changing the contact time, pH and initial metal ion concentration. Contact time 48 h and initial metal concentration 1000 ppm were found optimum for all the metal ions studied. pH 6.2 and 5 was observed best for Pb (II) and Cr(III) adsorption respectively. Kinetic ...

Polymer-Plastics …, 2010

The chitosan/starch blend films of 2: 1 ratio were prepared by solution casting. Tensile strength... more The chitosan/starch blend films of 2: 1 ratio were prepared by solution casting. Tensile strength (TS) and elongation at break (% Eb) of chitosan/starch blend film were found to be 9.33 MPa and 3.6%, respectively. The blend films (2% Chitosan) were soaked in six different formulations of methylmethacrylate (MMA) monomer and aliphatic urethane diacrylate oligomer (M-1200) at different time intervals (1–5 min) and irradiated under UV radiation at different intensities (5–35 pass). Formulations containing 43% MMA and 15% oligomer in ...

SN Applied Sciences

Nowadays, grafted polymeric composite has received much attention as an alternative adsorbent of ... more Nowadays, grafted polymeric composite has received much attention as an alternative adsorbent of heavy metal removal. The grafted polymeric adsorbent (GPA) in the form of composite was prepared using diallyl dimethyl ammonium chloride (DADMAC) and acrylic acid embedded nonwoven irradiated polythene sheet. The prepared GPA was characterized using Fourier transform infra-red (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis to understand molecular interaction, surface morphology and physical phenomena of them. The effect of parameters including pH, initial metal concentration, contact time, as well as temperature on the adsorption of Cu(II)/Cr(VI) was studied sequentially. The result shows that the GPA had utmost grafting yield of 192% with reaction time 4.0 h at 50 kGy. The maximum adsorption was found up to 153.89 mg Cu/g and 17.34 mg Cr/g with an initial concentration of 1000 ppm, a contact time of 24 h, pH of 4.84 [Cu(II)], and 1.5 [Cr(VI)] at room temperature (25 °C) indicating superb synergetic adsorption capacity of the GPA. Comparing the Langmuir and Freundlich adsorption isotherm models, the former fitted well with Cr and latter with Cu adsorption data implying that the models can be applied to uptake Cu(II)/Cr(VI) by GPA. In the kinetic adsorption experiment, adsorbed metal almost reached equilibrium about 10 h for the GPA and followed the pseudo-second-order kinetic model. Thus, the GPAs are propriety and competent in terms of capability and reusability to remove heavy metal ions.

Journal of Physical Science

To cite this article: Rahman, N. et al. (2018). Preparation of amidoxime adsorbent by radiation i... more To cite this article: Rahman, N. et al. (2018). Preparation of amidoxime adsorbent by radiation induced grafting of acrylonitrile on polyethylene film and its application in Cr(VI) removal.

Journal of Polymer Engineering

Environmental pollution due to heavy metal contamination is a major environmental concern. A full... more Environmental pollution due to heavy metal contamination is a major environmental concern. A fully biodegradable and reusable adsorbent hydrogel for removal of heavy metal ions has been developed. The hydrogel was prepared from acrylic acid and chitosan using an irradiation method. The adsorbent was characterized using Fourier transform infrared analysis. Uptake of copper(II) and lead(II) at different contact times, pH, and metal ion concentrations was investigated by a batch method using atomic absorption spectroscopy. Kinetic adsorption data were studied using pseudo-first-order and pseudo-second-order equations. Experimental metal adsorption data were fitted with the Langmuir isotherm model. The maximum adsorption capacity of the hydrogel was found to be 192 and 171 mg/g for lead(II) and copper(II), respectively, from the Langmuir isotherm model. Reuse and desorption of the hydrogel were also successful. The adsorbent can be used to adsorb Cu(II) and Pb(II) by the column method w...

Applied Chemical Engineering

Tea is a highly common beverage worldwide. In addition to other particles, it contains a range of... more Tea is a highly common beverage worldwide. In addition to other particles, it contains a range of minerals and trace elements. Even though many are necessary for humans, some could be hazardous. Scientists have long been interested in the toxicity of trace metals and how they affect human health. By using Flame Atomic Absorption Spectrophotometer, the amounts of Ni, Cu, Cd, Zn, Pb, Cr, and Mn in eight black tea leaves, five green tea leaves, and their infusions were examined. The tea samples were collected from Bangladeshi local markets. The infusion time in boiling water was 5 and 10 minutes. Results revealed that the concentration ranges of Ni, Cu, Cd, Zn, Pb, Cr and Mn in black and green tea leaves and their infusions of 5 minutes and 10 minutes were 1.82 to 41.32, 13.54 to 29.87, 0.48 to 2.16, 0.30 to 36.52, 0.04 to 3.89, 0.00 to 4.95 and 112.67 to 187.98 ppm respectively. Concentrations of the elements found in samples were compared with maximum values reported by World Health ...

International Journal of Polymer Science, 2016

Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room tempera... more Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room temperature (27 ∘ C) by applying 5, 10, 15, 20, and 25 kGy of gamma radiation to 15% AAc aqueous solutions containing 5, 7.5, and 15% of starch. With increment of the radiation dose, gel fraction became higher and attained the maximum (96.5%) at 15 kGy, above which the fraction got lowered. On the other hand, the gel fraction monotonically increased with the starch content. Swelling ratios were lower for the starch/AAc hydrogels prepared with higher gamma-ray doses and so with larger starch contents. Significant promotions of the swelling ratios were demonstrated by hydrolysis with NaOH: 13632 ± 10% for 15 kGy radiation-dosed [5% starch/15% AAc] hydrogel, while the maximum swelling ratio was ∼200% for those without the treatment. The authors further investigated the availability of the starch/AAc hydrogel as an adsorbent recovering dye waste from the industrial effluents by adopting methylene blue as a model material; the hydrogels showed high dye-capturing coefficients which increase with the starch ratio. The optimum dye adsorption was found to be 576 mg per g of the hydrogel having 7.5 starch and 15% AAc composition. Two kinetic models, (i) pseudo-first-order and (ii) pseudo-second-order kinetic models, were applied to test the experimental data. The latter provided the best correlation of the experimental data compared to the pseudo-first-order model.

Journal of Polymers and The Environment, Mar 17, 2017

An iminodiacetate (IDA) group containing nonwoven polyethylene (PE) film was prepared by radiatio... more An iminodiacetate (IDA) group containing nonwoven polyethylene (PE) film was prepared by radiation induced graft polymerization of an epoxy group containing monomer, glycidyl methacrylate (GMA) onto nonwoven PE fabric and subsequent chemical modification to IDA group. The effect of solvents (water, methanol, ethanol, isopropyl alcohol and dimethyl sulfoxide) on modification of epoxy group of GMA grafted PE (GMA-g-PE) fabric to IDA group was investigated. Ethanol provided a higher density of IDA group on GMA-g-PE fabric. Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and dynamic mechanical analysis of IDA-GMA-PE adsorbent, GMA-g-PE fabric and pure PE fabric were studied. The ability of resultant IDA adsorbent to absorb chromium from aqueous medium was evaluated by batch method. The parameters such as feeding chromium concentration, pH of chromium solution and adsorption time of IDA adsorbent were discussed. The obtained results illustrate that the IDA adsorbent could be fruitful to absorb chromium from water. The equilibrium experimental data for the adsorption of chromium on IDA adsorbent fitted Langmuir isotherm model.

In the present study alginate-starch blend films (thickness 0.08 mm) of different composition wer... more In the present study alginate-starch blend films (thickness 0.08 mm) of different composition were prepared by casting and their mechanical properties were studied. Highest tensile strength was obtained for alginate: starch = 4: 1 of 70 MPa. To impart antimicrobial property to the alginate-starch films, citric acid of different composition was used and CaCl2 treatment of this film was performed to improve the stability of the films in water. Then the films were further modified with monomer, methylacrylate (MA) and gamma radiation. The blend films were soaked in different formulations of methylacrylate (MA), in methanol and then irradiated by gamma radiation. Mechanical properties of the modified films such as tensile strength and elongation at break were studied. Thermal properties of films were characterized by dynamic mechanical analysis (DMA). The structural and morphological features of films were investigated using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM).

Fabrication of Starch-Acrylic acid-Acrylamide hydrogel were accomplished by the use of gamma rays... more Fabrication of Starch-Acrylic acid-Acrylamide hydrogel were accomplished by the use of gamma rays from Co-60 source at room temperature. The adsorbent were characterized by IR. The prepared absorbent was utilized for absorption of uranium (VI) from aqueous solution. To investigate the effect of adsorption conditions on absorption capacity of the adsorption experiment were executed at changed contact time, pH, temperature and concentration of uranium (VI) solution. Absorption by the absorbent attains the equilibrium value after 5 hours. pH 3.7 was found optimum considering the highest absorption capacity. The absorption capacity shows highest value at 1000 ppm U(VI) concentration. The absorption capacity achieved under most favorable condition was 166.84 mg/g. Isotherm and kinetic models were used to interpret the U(VI) adsorption mechanism on the hydrogel. Results of desorption of U(VI) ions and reuse of the absorbent are hopeful. From the study it can be said that the starch-acrylic acid-acrylamide hydrogel absorbent have potential for uranium (VI) removal from contaminated water.

Journal of Thermodynamics & Catalysis, 2022

In this study, a new amidoxime adsorbent based on waste Polypropylene (PP) fabric was prepared fo... more In this study, a new amidoxime adsorbent based on waste Polypropylene (PP) fabric was prepared for the adsorption of aqueous Cr (VI) metal ions. The pre-irradiation technique was used for grafting Acrylonitrile (AN) onto PP fabric. The grafting reaction was carried out at 80˚C in a water bath for 4 hours, utilizing H 2 SO 4 as an additive using 60% AN concentration and a 30 kGy radiation dose. The amidoxime adsorbent was produced by treating Acrylonitrile grafted Polypropylene (AN-g-PP) with NH 2 OH.HCl and characterized by FTIR, SEM, TGA, and DMA. The adsorption of Cr (VI) was investigated under various contact time, pH, temperature, and metal ion concentration circumstances. Both the Langmuir and Freundlich isotherm models were used to fit the equilibrium adsorption data. The kinetic data follows the pseudo-first-order model, and the estimated and experimental sorption capacities are in good agreement. The thermodynamic data showed that the sorption process was endothermic and spontaneous, taking place by increasing the randomness of the system. Furthermore, the study of the desorption of Cr (VI) from the adsorbent surface and reuse of the adsorbent indicates that the adsorbent can be applied effectively for the efficient removal of Cr (VI) ions from aqueous solutions.

Analytical Chemistry: An Indian Journal, 2022

In the present research work, γ-ray initiated grafting of Glycidyl Methacrylate (GMA) on non-wove... more In the present research work, γ-ray initiated grafting of Glycidyl Methacrylate (GMA) on non-woven polyethylene fabrics was followed by amine functionalization. Dependence of amination yield on degree of grafting was investigated. Extensive examinations on the adsorption of anionic dye Methyl Orange (MO) from aqueous solution by the functionalized GMA-g-non woven PE fabrics were conducted. Influence of variation of adsorption environment likely contact time, temperature, pH and initial metal ion concentration on MO adsorption aptitude was experimented. The optimal condition that provided maximum MO adsorption was identified to be contact time 48 h, initial metal concentration 500 ppm, pH 1.759 and temperature 80ºC. To understand the equilibrium between MO and the absorbent system Langmuir isotherm model was considered. Good fitting with Langmuir isotherm model suggested that MO adsorption was restricted to one molecular layer and the highest monolayer adsorption capacity calculated was 60.60 mg/g. The adsorption kinetics was analyzed using pseudo-first-order and pseudo-second-order models. The adsorption of MO was successfully inferred with pseudosecond-order model. The bonding between different groups and the surface morphology of the adsorbent was explored by FTIR ad SEM Analysis. Successful desorption of MO followed by reuse of the regenerated adsorbent fabric revealed the future prospect of the reusable adsorbent.

Journal of Polymer Engineering, 2022

This study focuses on the adsorption of hazardous Cr (III) and Cu (II) ions from aqueous solution... more This study focuses on the adsorption of hazardous Cr (III) and Cu (II) ions from aqueous solution by applying modified waste polypropylene (PP) fabric as an adsorbent. Pre-irradiation technique was performed for grafting of sodium styrene sulfonate (SSS) and acrylic acid (AAc) onto the PP fabric. The monomer containing 8% SSS and 16% AAc in water was used. Graft yield at 30 kGy radiation dose was 390% when 4% NaCl was added as additive. The prepared adsorbent was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA) and dynamic mechanical analyzer (DMA). The influences of different parameters including pH, contact time, temperature and initial metal ion concentration were also investigated. The equilibrium adsorption data were better fitted to the Langmuir isotherm model with maximum monolayer adsorption capacity 384.62 mg/g for Cr (III) and 188.68 mg/g for Cu (II) ions. The kinetic data were better exp...

Environmental Research and Technology, 2021

In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-wove... more In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-woven polyethylene fabric using pre-irradiation method and the grafted adsorbent is employed for Cr(III) and Pb(II) adsorption. After irradiation of the non-woven polyethylene fabrics with 50 kGy radiation dose the grafting reaction was carried out at 80º C with monomer solution consisted of 30% AAc, 10% SSS and 4% NaCl in water. A high graft yield of 270% was achieved. Fourier Transform Infrared, Scanning Electron Microscopy and Thermo-gravimetric Analysis were used to analyze the adsorbent. Pb (II) and Cr (III) adsorption from synthetic aqueous solution was attempted by the grafted adsorbent. Adsorption study was accomplished by changing the contact time, pH and initial metal ion concentration. Contact time 48 h and initial metal concentration 1000 ppm were found optimum for all the metal ions studied. pH 6.2 and 5 was observed best for Pb (II) and Cr(III) adsorption respectively. Kinetic adsorption data fitted better with pseudo-second-order equation than pseudo-first-order. Good correlation of experimental data with Langmuir isotherm model suggested monolayer adsorption. Langmuir equation showed that the maximum adsorption capacity for Pb (II) was 38.46 mg g-1 and Cr (III) was 111.11 mg g-1. Experiment on desorption of metal ions and reuse of the adsorbent depicted good results. Adsorbent also showed efficient adsorption of Cr(III) from real waste water. From all the findings it can be expected that the AAc-SSS grafted PE fabric can successfully eliminate Cr(III) and Pb(II) from industrial waste water.

A novel, regenerative and biodegradable acrylic acid hydrogel having different chitosan compositi... more A novel, regenerative and biodegradable acrylic acid hydrogel having different chitosan composition (w = 0, 0.5, 1.0 and 1.5 %) was constructed using gamma radiation from the Cobalt-60 source. The prepared hydrogel was treated with alkali to enhance its dye adsorption capacity. Uptake capability of the hydrogel at different chitosan percentage, contact time, pH, and methylene blue (MB) concentrations was measured using UV Spectrometer. MB uptake ability obtained was found to escalate proportionately with escalating chitosan percentage and alkali treatment. Kinetics and isotherm of MB adsorption mechanism were analyzed. Pseudosecond- order model and Langmuir isotherm model were followed by the Hydrogel MB uptake capacity. The adsorption efficiency of monolayer saturation of the alkali-treated adsorbent was 322 mg/g as obtained from Langmuir equation. Desorption and reuses of the hydrogel were successfully carried out. The results indicated that acrylic acid-chitosan hydrogel is feasi...

Fundamentals of Natural Fibres and Textiles, 2021

International Journal of Polymer Science, 2016

Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room tempera... more Several kinds of acrylic-acid-grafted-starch (starch/AAc) hydrogels were prepared at room temperature (27 ∘ C) by applying 5, 10, 15, 20, and 25 kGy of gamma radiation to 15% AAc aqueous solutions containing 5, 7.5, and 15% of starch. With increment of the radiation dose, gel fraction became higher and attained the maximum (96.5%) at 15 kGy, above which the fraction got lowered. On the other hand, the gel fraction monotonically increased with the starch content. Swelling ratios were lower for the starch/AAc hydrogels prepared with higher gamma-ray doses and so with larger starch contents. Significant promotions of the swelling ratios were demonstrated by hydrolysis with NaOH: 13632 ± 10% for 15 kGy radiation-dosed [5% starch/15% AAc] hydrogel, while the maximum swelling ratio was ∼200% for those without the treatment. The authors further investigated the availability of the starch/AAc hydrogel as an adsorbent recovering dye waste from the industrial effluents by adopting methylene blue as a model material; the hydrogels showed high dye-capturing coefficients which increase with the starch ratio. The optimum dye adsorption was found to be 576 mg per g of the hydrogel having 7.5 starch and 15% AAc composition. Two kinetic models, (i) pseudo-first-order and (ii) pseudo-second-order kinetic models, were applied to test the experimental data. The latter provided the best correlation of the experimental data compared to the pseudo-first-order model.

In this study, a new amidoximated adsorbent based on waste polypropylene (PP) fabric was prepared... more In this study, a new amidoximated adsorbent based on waste polypropylene (PP) fabric was prepared for the adsorption of aqueous Cr (VI) metal ions. Pre-irradiation technique was employed for grafting of acrylonitrile (AN) on PP fabric. The grafting reaction was carried out at 80oC in a water bath for 4 hours utilizing sulfuric acid (2% of AN) as additive and the percentage of grafting obtained was 150% using 60% AN concentration and 30 kGy radiation dose. The amidoximated adsorbent was produced by treating acrylonitrile (AN) grafted PP (AN-g-PP) with NH2OH.HCl and characterized by FTIR, SEM, TGA and DMA. The removal of Cr (VI) was examined under several conditions such as contact time, pH, temperature, initial Cr (VI) concentration. The equilibrium adsorption data were fitted to both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the adsorbent was found to be 232.56 mg/g calculated from Langmuir equation. Kinetic studies have exhibited that the highest r...

American Journal of Polymer Science and Technology

An environmental affable, economically feasible and reusable sulfonated adsorbent were constructe... more An environmental affable, economically feasible and reusable sulfonated adsorbent were constructed by gamma radiation grafting of glycidyl methacrylate (GMA) on non-woven polyethylene fabric and subsequent chemical modification. Highest graft yield of 343.31% was obtained at favourable conditions: 30 kGy radiation dose, 5% monomer concentration, adding up of 0.5% Tween-20 as an additive, 4 h reaction time. The epoxide group containing GMA-g-PE film were functionalized through sulfonation. The adsorbent was identified by Fourier Transform Infrared (FTIR), Scanning Electron Microscopy (SEM) and Thermo-gravimetric Analysis (TGA). The aqueous solutions of methylene blue were prepared in various concentrations and adsorption behavior by the developed sulfonated-GMA-g-PE film were investigated. MB uptake capacity at different environment such as contact time, pH and initial MB concentration were identified. The adsorption of MB is highly pH dependent and utmost sorption was found at pH 7. The kinetic adsorption data were interpreted by pseudo-first-order and pseudo-second-order equations. Pseudo-first-order rate kinetic model is more applicable for the sorption process due to its higher correlation coefficient. From the two isotherm model Langmuir and Fruendlich, Fruendlich model attuned best with the MB sorption as presented by higher correlation coefficient. The MB uptake capacity of the sorbent obtained from Langmuir model was 500 mg/g. Futhermore, the adsorbent could be reformed and reused repeatedly for the sorption of MB from waste water.

Environmental Research and Technology, 2021

In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-wove... more In present study acrylic acid (AAc) and sodium styrene sulfonate (SSS) were grafted onto non-woven polyethylene fabric using pre-irradiation method and the grafted adsorbent is employed for Cr(III) and Pb(II) adsorption. After irradiation of the non-woven polyethylene fabrics with 50 kGy radiation dose the grafting reaction was carried out at 80º C with monomer solution consisted of 30% AAc, 10% SSS and 4% NaCl in water. A high graft yield of 270% was achieved. Fourier Transform Infrared, Scanning Electron Microscopy and Thermo-gravimetric Analysis were used to analyze the adsorbent. Pb (II) and Cr (III) adsorption from synthetic aqueous solution was attempted by the grafted adsorbent. Adsorption study was accomplished by changing the contact time, pH and initial metal ion concentration. Contact time 48 h and initial metal concentration 1000 ppm were found optimum for all the metal ions studied. pH 6.2 and 5 was observed best for Pb (II) and Cr(III) adsorption respectively. Kinetic ...

Polymer-Plastics …, 2010

The chitosan/starch blend films of 2: 1 ratio were prepared by solution casting. Tensile strength... more The chitosan/starch blend films of 2: 1 ratio were prepared by solution casting. Tensile strength (TS) and elongation at break (% Eb) of chitosan/starch blend film were found to be 9.33 MPa and 3.6%, respectively. The blend films (2% Chitosan) were soaked in six different formulations of methylmethacrylate (MMA) monomer and aliphatic urethane diacrylate oligomer (M-1200) at different time intervals (1–5 min) and irradiated under UV radiation at different intensities (5–35 pass). Formulations containing 43% MMA and 15% oligomer in ...

SN Applied Sciences

Nowadays, grafted polymeric composite has received much attention as an alternative adsorbent of ... more Nowadays, grafted polymeric composite has received much attention as an alternative adsorbent of heavy metal removal. The grafted polymeric adsorbent (GPA) in the form of composite was prepared using diallyl dimethyl ammonium chloride (DADMAC) and acrylic acid embedded nonwoven irradiated polythene sheet. The prepared GPA was characterized using Fourier transform infra-red (FTIR), scanning electron microscopy (SEM), and thermogravimetric analysis to understand molecular interaction, surface morphology and physical phenomena of them. The effect of parameters including pH, initial metal concentration, contact time, as well as temperature on the adsorption of Cu(II)/Cr(VI) was studied sequentially. The result shows that the GPA had utmost grafting yield of 192% with reaction time 4.0 h at 50 kGy. The maximum adsorption was found up to 153.89 mg Cu/g and 17.34 mg Cr/g with an initial concentration of 1000 ppm, a contact time of 24 h, pH of 4.84 [Cu(II)], and 1.5 [Cr(VI)] at room temperature (25 °C) indicating superb synergetic adsorption capacity of the GPA. Comparing the Langmuir and Freundlich adsorption isotherm models, the former fitted well with Cr and latter with Cu adsorption data implying that the models can be applied to uptake Cu(II)/Cr(VI) by GPA. In the kinetic adsorption experiment, adsorbed metal almost reached equilibrium about 10 h for the GPA and followed the pseudo-second-order kinetic model. Thus, the GPAs are propriety and competent in terms of capability and reusability to remove heavy metal ions.

Journal of Physical Science

To cite this article: Rahman, N. et al. (2018). Preparation of amidoxime adsorbent by radiation i... more To cite this article: Rahman, N. et al. (2018). Preparation of amidoxime adsorbent by radiation induced grafting of acrylonitrile on polyethylene film and its application in Cr(VI) removal.

Journal of Polymer Engineering

Environmental pollution due to heavy metal contamination is a major environmental concern. A full... more Environmental pollution due to heavy metal contamination is a major environmental concern. A fully biodegradable and reusable adsorbent hydrogel for removal of heavy metal ions has been developed. The hydrogel was prepared from acrylic acid and chitosan using an irradiation method. The adsorbent was characterized using Fourier transform infrared analysis. Uptake of copper(II) and lead(II) at different contact times, pH, and metal ion concentrations was investigated by a batch method using atomic absorption spectroscopy. Kinetic adsorption data were studied using pseudo-first-order and pseudo-second-order equations. Experimental metal adsorption data were fitted with the Langmuir isotherm model. The maximum adsorption capacity of the hydrogel was found to be 192 and 171 mg/g for lead(II) and copper(II), respectively, from the Langmuir isotherm model. Reuse and desorption of the hydrogel were also successful. The adsorbent can be used to adsorb Cu(II) and Pb(II) by the column method w...