Taha Elmorsi - Academia.edu (original) (raw)
Papers by Taha Elmorsi
International Journal of Environmental Research and Public Health
In this study, a valuable adsorbent was functionalized using commercial ZnO and a mango seed extr... more In this study, a valuable adsorbent was functionalized using commercial ZnO and a mango seed extract (MS-Ext) as a green approach for synthesis. Fourier-transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and energy-dispersive X-ray analysis spectraconfirmed the presence of bioactive phenolic compounds and Cu2+ ions on the surface of ZnO. Functionalized Cu-doped ZnO/MS-Ext exhibits high efficacy in acidic, neutral, and alkaline medium, as indicated by 98.3% and 93.7% removal of methylene blue (MB) and crystal violet (CV) dyes, respectively. Cu-doped ZnO/MS-Ext has a zeta potential significantly lower than pristine zinc oxide (p-ZnO), which results in enhanced adsorption of cationic MB and CV dyes. In binary systems, both MB and CV were significantly removed in acidic and alkaline media, with 92% and 87% being removed for CV in acidic and alkaline media, respectively. In contrast, the removal efficiency of methyl orange dye (MO) was 16.4%,...
Engineering, Construction, and Operations in Challenging Environments, 2004
Using titanium dioxide (TiO 2 ) to photocatalytically degrade persistent and hazardous organic co... more Using titanium dioxide (TiO 2 ) to photocatalytically degrade persistent and hazardous organic contaminants present in aqueous waste streams has been extensively examined and utilized for many applications. Typically these organic contaminants contain aromatic and/or halogenated functional groups. Their oxidative destruction to CO 2 or smaller polar organic molecules that are readily biodegradable, such as alcohols and ketones, is usually considered an effective treatment. However, in considering the use of TiO 2 photocatalytic degradation to treat water intended for human consumption, the reaction products and photodegradation kinetics of small polar organic compounds must be carefully considered. Such compounds are highly soluble and do not adsorb strongly to the TiO 2 surface and so they may therefore be fairly resistant to photodegradation. In this study, preliminary experiments examined the photodegradation of isopropanol, and its photodegradation product acetone, as a function of pH and with several different TiO 2 substrates, with the eventual goal of providing a suitable photocatalyst for the final processing step in NASA's Water Recovery System (WRS). Isopropanol and acetone were selected as test compounds since they were detected at several processing points in the NASA WRS. In the absence of TiO 2 , using a 450 watt mercury lamp, direct photolysis of isopropanol (100 ppm) resulted in insignificant degradation over 3 hrs. However, in the presence of 2g/L TiO 2 at natural pH, isopropanol completely disappeared within 3 hrs, resulting in the nearly complete transformation into acetone. Subsequent photodegradation of acetone occurred at a much slower rate and was completely mineralized in approximately 8 hrs. Increasing the pH slightly decreased the photodegradation rate of isopropanol and lead to 25 ppm of acetone remained undegraded during the reaction period. This suggests that • OH radicals are being scavenged by carbonate ions that are produced by acetone mineralization. Conversely, the degradation rate of isopropanol and acetone was enhanced slightly by increasing the ionic strength. The presence of tetranitromethane decreased the isopropanol degradation significantly from 85 to 59% over 75 min. This result, combined with the minimal degree of adsorption of isopropanol and acetone onto the surface of the photocatalyst, suggests that the photodegradation pathway occur via free • OH radicals in bulk solution rather than on the catalyst surface.
The aimof this research was to investigate the potential of low- cost locally available stem wate... more The aimof this research was to investigate the potential of low- cost locally available stem water hyacinth (SWH) as an adsorbent for removal of acid green 20 (AG20) as an anionic dye fromaqueous solution. Equilibriumbehavior of SWH was investigated by performing batch adsorption experiments. The effect of initial dye concentration, pH, contact time and adsorbent dose on the adsorption process were evaluated. Adsorption isotherm models, Langmuir (four different forms), Freundlich and Temkin were used to simulate the equilibrium data at different experimental parameters (pH and adsorbent particle size). For Langmuir isotherm model, the four linear equations were discussed and used to obtain the isotherm parameters. Langmuir-II form was found to have the highest coefficient of determination (R2 = 0.999) compared with the other Langmuir linear equations.Also, it was found that SWH has a high adsorptive capacity towards MB dye (200 mg/g) as determined by Langmuir-II model. SWH show favo...
Journal of Hazardous Materials, 2010
Decolorization of the Mordant red 73 (MR73) azo dye in water was investigated in laboratory-scale... more Decolorization of the Mordant red 73 (MR73) azo dye in water was investigated in laboratory-scale experiments using UV/H 2 O 2 and photo-Fenton treatments. Photodegradation experiments were carried out in a stirred batch photoreactor equipped with a low-pressure mercury lamp as UV source at 254 nm. The effect of operating parameters such as pH, [H 2 O 2 ] , [dye] and the presence of inorganic salts (NaNO 3 , NaCl and Na 2 CO 3) were also investigated. The results indicated that complete dye decolorization was obtained in less than 60 min under optimum conditions. Furthermore, results showed that dye degradation was dependent upon pH, [H 2 O 2 ] and initial dye concentration. The presence of chloride ion led to large decreases in the photodegradation rate of MR73 while both nitrate and carbonate ions have a slight effect. The photo-Fenton treatment, in the presence of Fe powder as a source of Fe 2+ ions, was highly efficient and resulted in 99% decolorization of the dye in 15 min. Mineralization of MR73 dye was investigated by determining chemical oxygen demand (COD). In a 3 h photoperiod "65%" of the dye was mineralized by the H 2 O 2 /UV process, while the photo-Fenton treatment was more efficient producing 85% mineralization over the same 3-h period.
The aim of this research was to investigate the potential of low-cost locally available stem wate... more The aim of this research was to investigate the potential of low-cost locally available stem water hyacinth (SWH) as an adsorbent for removal of acid green 20 (AG20) as an anionic dye from aqueous solution. Equilibrium behavior of SWH was investigated by performing batch adsorption experiments. The effect of initial dye concentration, pH, contact time and adsor-bent dose on the adsorption process were evaluated. Adsorption isotherm models, Langmuir (four different forms), Freundlich and Temkin were used to simulate the equilibrium data at different experimental parameters (pH and adsorbent particle size). For Langmuir isotherm model, the four linear equations were discussed and used to obtain the isotherm parameters. Langmuir-II form was found to have the highest coefficient of determination (R 2 = 0.999) compared with the other Langmuir linear equations. Also, it was found that SWH has a high adsorptive capacity towards MB dye (200 mg/g) as determined by Langmuir-II model. SWH show...
A simple route of synthesis of doped ZnO nanoparticles with efficient response to solar light has... more A simple route of synthesis of doped ZnO nanoparticles with efficient response to solar light has always been demanded. Doped ZnO has been applied as a photocatalyst for the degradation of hazardous dyes such as Congo red (CR) dye. In this study, a simple approach for Na-doped ZnO (Na-ZnO) nanoparticles by co-precipitation using NaOH as a precipitating and doping agent was reported. Changing the molar ratio between the moles of NaOH and Zn+2 ions as 3:1 was the main key for this approach. As-prepared Na-ZnO was characterized by different morphological and optical analysis. Na-ZnO confirmed to be solar photocatalyst used for the degradation of aqueous solution of 30 mg/L CR dye with high efficient as 98.9% removal in 70 min under direct sunlight. Moreover, main parameters affecting the photocatalytic degradation of CR dye such as the effect of pH, initial dye concentration and effect of day time on the photodegradation process of CR dye were investigated. In presence of direct sunlig...
Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H 2 O 2 , advanced oxi... more Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H 2 O 2 , advanced oxidation process was investigated in this study. Results show that MR17 dye decolorization rate was mainly effected by different parameters such as solution pH, H 2 O 2 concentration, initial dye concentrations and presence of different inorganic anions such as NO 3 , Cl , CO 3 2ions. The degradation percent of the dye decreased by the presence of inorganic anions in the order of CO 3 2> Cl > NO 3 ions. While increase the temperature of the solution medium from 283 to 318K led to increase the decolorization rate of MR17 dye from 0.048 to 0.164 min. The low value of the apparent activation energy E a (24.91 kJ mol) indicates that decolorization process of MR17 dye is achieved easily using H 2 O 2 /UV process. This results further proved by presence of 100% decolorization of MR17 dye in about 50 min and about 85.57% mineralization in a 3.0 h photoperiod. 2011 Trade Science Inc. INDIA
Mahmoud S.Aboul-Fetouh1, Taha M.Elmorsi1,2*, Jamal M.El-Kady1, Hassan A.El-Adawi1 Chemistry Depar... more Mahmoud S.Aboul-Fetouh1, Taha M.Elmorsi1,2*, Jamal M.El-Kady1, Hassan A.El-Adawi1 Chemistry Department, Faculty of Science, Al-Azhar University, 11884, Cairo, (EGYPT) Chemistry Department, Faculty of Science, Jazan University, Jazan, 706, (KSA) E-mail : taha_elmorsi@yahoo.com Received: 27 June, 2010 ; Accepted: 7 July, 2010 Environmental Science An Indian Journal Trade Science Inc. Volume 5 Issue 4
Photocatalytic properties of photocatalysts depend generally on techniques employed for preparing... more Photocatalytic properties of photocatalysts depend generally on techniques employed for preparing nanostructures and doping processes. Nanostructured zinc oxides (ZnO) are promising photocatalysts due to their high stability, high surface activity, and low costs. This study highlights a simple method of a co-precipitation for synthesizing ZnO and potassium doped ZnO (K-ZnO). In this research, surface functionalization with high quality explored by multiple surface analytical methods such as crystal structural, morphology analysis, inductively coupled plasma-atomic emissions spectroscopy (ICP-AES) and scanning electron microscopy (SEM) attached with energy dispersive x-ray (SEM/EDX). The approach is well suited to produce crystalline K-ZnO, which possesses a shape of nanorods (35.2 to 48.9 nm) and acts as an efficient visible light responsive photocatalyst. The results indicated that the K-ZnO is more responsive to the visible light than pure ZnO. The degradation efficiency of 2-naph...
Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H2O2, advanced oxidati... more Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H2O2, advanced oxidation process was investigated in this study. Results show that MR17 dye decolorization rate was mainly effected by different parameters such as solution pH, H2O2 concentration, initial dye concentrations and presence of different inorganic anions such as NO3 -, Cl- , CO3 2- ions. The degradation percent of the dye decreased by the presence of inorganic anions in the order of CO3 2- > Cl- > NO3 - ions.While increase the temperature of the solutionmediumfrom283 to 318K led to increase the decolorization rate ofMR17 dye from0.048 to 0.164min-1. The lowvalue of the apparent activation energy Ea (24.91 kJ mol-1) indicates that decolorization process of MR17 dye is achieved easily using H2O2/UV process. This results further proved by presence of 100% decolorization ofMR17 dye in about 50min and about 85.57%mineralization in a 3.0 h photoperiod.
Journal of Fluorescence
A new turn on fluorescence probe based on 3′,6′-dihydroxy-6-methyl-2-((pyridin-2-ylmethylene)amin... more A new turn on fluorescence probe based on 3′,6′-dihydroxy-6-methyl-2-((pyridin-2-ylmethylene)amino)-4-(p-tolyl)spiro[benzo[f]isoindole-1,9′-xanthen]-3(2H)-one (BFFPH) derived from benzo[f]fluorescein was prepared. Full characterization of the prepared probe using spectroscopic analysis was described such as IR, NMR and MS spectra. The sensitivity of BFFPH for monitoring of pH change in alkaline medium was studied. BFFPH exhibited a high sensitivity to alkaline pH by two pKa values at 8.82 and 10.66 in UV/vis spectroscopy titration. The pH monitoring was studied in broad range of pH values (2.5–12.2) at two pKa values at 8.72 and 10.73 by recording the effect of pH on the fluorescence intensity of BFFPH. The acid-base reversibility character of the probe was investigated as well as the effect of the pH change on the fluorescence quantum yield. The application of the prepared BFFPH probe for detection of living Escherichia coli (E. coli) bacteria using confocal fluorescence microscope was investigated.
Al-Azhar Bulletin of Science, Jun 1, 2011
In present study, the ability of water hyacinths to adsorb Congo red (CR) from aqueous solutions ... more In present study, the ability of water hyacinths to adsorb Congo red (CR) from aqueous solutions were investigated in a fixed-bed column. Effects of important parameters, such as the value of initial pH, existed salt, the flow rate, the influent concentration of CR and bed depth, were assessed. The Thomas model was applied to adsorption of CR at different flow rate, influent concentration to predict the breakthrough curves and to determine the characteristic parameters of the column' suitability for process design using non-linear regression. Bed-depth/service time analysis (BDST) model was also applied at different bed depths to predict the breakthrough curves. The two models were found suitable for describing the biosorption process of the dynamic behavior of the water hyacinths column. Quoted results have suggested that water hyacinths as adsorbent to removal CR from solution be efficient, and the rate of biosorption process be rapid. When the flow rate was 0.5 ml min −1 and the influent concentration of CR was 30 mg l −1 , the equilibrium adsorption biomass reached 109 mg g −1 according to Thomas model.
Zeitschrift für anorganische und allgemeine Chemie
The colorimetric chemosensor 2-((3,5-dichloro-2-hydroxybenzylidene)amino)-3′,6′-dihydroxy-6-methy... more The colorimetric chemosensor 2-((3,5-dichloro-2-hydroxybenzylidene)amino)-3′,6′-dihydroxy-6-methyl-4-(p-tolyl)spiro[benzo[f]isoindole-1,9′-xanthen]-3(2H)-one (BFFSH) derived from benzo[f]fluorescein dye was synthesized. NMR and IR spectroscopy as well as mass spectrometry were used to confirm the compound. BFFSH shows potential application for detecting metal ions in aqueous solution. It displays a colorimetric selectivity and sensitivity towards the aqueous solution of Cu2+ ions with a detection limit in the nano-molar range (1.69 nM). In addition, the application of BFFSH was extended for the detection of Cu2+ ions in real water samples (tap and synthetic water) with a high recovery percentage. Additionally, the association constant (Ka) of BFFSH, which binds with Cu2+ ions based on 2:1 stoichiometry was calculated.
Journal of Environmental Protection
The purpose of this study was to prepare nano-titanium tannate complex (TTC) and to investigate i... more The purpose of this study was to prepare nano-titanium tannate complex (TTC) and to investigate its adsorption capacity for removal of cationic dyes such as crystal violet (CV) dye. The morphology and the main elements of TTC adsorbent were characterized by scanning electron microscopy (SEM-EDS), while its crystal structure was characterized by X-ray diffraction (XRD). Also, FT-IR spectroscopy study structural aspects of TTC. A "cotton-ball"-like and porous surface structure of titanium tannate complex (TTC) with nanoparticle size of 16.18 nm show high capability for absorbing crystal violet dye. The effect of several parameters such as contact time, initial concentrations of CV, solution pH and the amount of TTC was investigated. Three different kinetic equations such as pseudo-first order, pseudo-second order and intraparticle diffusion were used to study the order and the mechanism of the adsorption process. The adsorption of CV dye followed pseudosecond order equation. Moreover, equilibrium data were tested with four adsorption isotherm models namely, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R). Langmuir was the best fit for the data with maximum capacity as 58.8 mg/g. The results of Separation factor, Surface coverage and standard free energy (∆G˚) indicated that adsorption of CV onto TTC was favorable with fast rate and spontaneous physical adsorption process.
Sensors and Actuators B: Chemical
Canadian Journal of Chemistry, 2017
This research aims to use modified ZnO nanoparticles to enhance the removal rate of the methylene... more This research aims to use modified ZnO nanoparticles to enhance the removal rate of the methylene blue (MB) dye. ZnO nanoparticles are modified by coating their surface with Congo red (CR) dye, henceforth referred to as ZnO/CR. This process is used to produce a Lewis acid on the surface of ZnO to attract any Lewis base such as a MB dye (MB+). Therefore, the stability of ZnO/CR improved, and it resists the change in pH value (from 3 to 9). Several analysis techniques such as scanning electron microscopy, X-ray diffraction, FTIR, and BET method were used to characterize ZnO/CR. Nonlinear and linear regressions of pseudo first-order, pseudo second-order, and Elovich models were used to calculate the kinetic parameters of the adsorption process. The best-fit kinetic equation was investigated using three functions of error analysis: the sum of the squares of the errors, chi-square analysis, and the coefficient of determination. The intraparticle diffusion equation was used to study the d...
Small polar organic compounds such as alcohols, ketones and aldehydes are highly soluble and do n... more Small polar organic compounds such as alcohols, ketones and aldehydes are highly soluble and do not adsorb strongly to the TiO2 surface and, therefore, may be fairly resistant to photocatalytic degradation. Photodegradation of an aqueous solution of isopropanol and its resulting photodegradation product acetone was investigated as a function of TiO2 substrate concentrations and solution ionic strength and pH. In the presence of 2g/L TiO2, isopropanol completely disappeared within 3 hrs, resulting in the nearly complete transformation into acetone. Subsequent photodegradation of acetone occurred at a much slower rate and resulted in complete mineralization. Increasing the pH slightly decreased the photodegradation rate. Conversely, the degradation rate was enhanced slightly by increasing the ionic strength. The presence of tetranitromethane decreased the isopropanol degradation significantly. This result, combined with the minimal degree of adsorption of isopropanol and acetone onto the surface of the photocatalyst, suggests that the photodegradation pathway occurs via free OH radicals in bulk solution rather than on the catalyst surface.
Journal of Environmental Protection, 2014
International Journal of …, 2004
The photochemical oxidation of a series of short-chain polychlorinated n-alkane (PCA) mixtures wa... more The photochemical oxidation of a series of short-chain polychlorinated n-alkane (PCA) mixtures was investigated using H 2 O 2 /UV and modified photo-Fenton conditions (Fe 3+ /H 2 O 2 /UV) in both Milli-Q and lake water. All PCA mixtures, including chlorinated (Cl 5 to Cl 8) decanes, undecanes, dodecanes and tridecanes degraded in 0.02 M H 2 O 2 /UV at pH 2.8 in pure water, with 80 ± 4% disappearance after 3 h of irradiation using a 300 nm light source. Degradation was somewhat enhanced under similar conditions but in natural water. The modified photo-Fenton system was more effective in degrading PCAs, with 72% and 80% disappearance of chlorinated decanes in 45 min of irradiation in pure and natural water, respectively. Carbon chain-length had minimal effect on degradation rates; however, increased degree of chlorination (from Cl 5 to Cl 8) resulted in slower initial degradation rates and less complete conversion after 3 h of irradiation. Three hours of irradiation in natural water/H 2 O 2 /UV resulted in 95% degradation of parent PCAs accompanied by 93% release of chloride ion. Quantitative dechlorination, which may be indicative of complete mineralization, suggests that this is an effective water remediation technique for PCAs.
International Journal of Environmental Research and Public Health
In this study, a valuable adsorbent was functionalized using commercial ZnO and a mango seed extr... more In this study, a valuable adsorbent was functionalized using commercial ZnO and a mango seed extract (MS-Ext) as a green approach for synthesis. Fourier-transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and energy-dispersive X-ray analysis spectraconfirmed the presence of bioactive phenolic compounds and Cu2+ ions on the surface of ZnO. Functionalized Cu-doped ZnO/MS-Ext exhibits high efficacy in acidic, neutral, and alkaline medium, as indicated by 98.3% and 93.7% removal of methylene blue (MB) and crystal violet (CV) dyes, respectively. Cu-doped ZnO/MS-Ext has a zeta potential significantly lower than pristine zinc oxide (p-ZnO), which results in enhanced adsorption of cationic MB and CV dyes. In binary systems, both MB and CV were significantly removed in acidic and alkaline media, with 92% and 87% being removed for CV in acidic and alkaline media, respectively. In contrast, the removal efficiency of methyl orange dye (MO) was 16.4%,...
Engineering, Construction, and Operations in Challenging Environments, 2004
Using titanium dioxide (TiO 2 ) to photocatalytically degrade persistent and hazardous organic co... more Using titanium dioxide (TiO 2 ) to photocatalytically degrade persistent and hazardous organic contaminants present in aqueous waste streams has been extensively examined and utilized for many applications. Typically these organic contaminants contain aromatic and/or halogenated functional groups. Their oxidative destruction to CO 2 or smaller polar organic molecules that are readily biodegradable, such as alcohols and ketones, is usually considered an effective treatment. However, in considering the use of TiO 2 photocatalytic degradation to treat water intended for human consumption, the reaction products and photodegradation kinetics of small polar organic compounds must be carefully considered. Such compounds are highly soluble and do not adsorb strongly to the TiO 2 surface and so they may therefore be fairly resistant to photodegradation. In this study, preliminary experiments examined the photodegradation of isopropanol, and its photodegradation product acetone, as a function of pH and with several different TiO 2 substrates, with the eventual goal of providing a suitable photocatalyst for the final processing step in NASA's Water Recovery System (WRS). Isopropanol and acetone were selected as test compounds since they were detected at several processing points in the NASA WRS. In the absence of TiO 2 , using a 450 watt mercury lamp, direct photolysis of isopropanol (100 ppm) resulted in insignificant degradation over 3 hrs. However, in the presence of 2g/L TiO 2 at natural pH, isopropanol completely disappeared within 3 hrs, resulting in the nearly complete transformation into acetone. Subsequent photodegradation of acetone occurred at a much slower rate and was completely mineralized in approximately 8 hrs. Increasing the pH slightly decreased the photodegradation rate of isopropanol and lead to 25 ppm of acetone remained undegraded during the reaction period. This suggests that • OH radicals are being scavenged by carbonate ions that are produced by acetone mineralization. Conversely, the degradation rate of isopropanol and acetone was enhanced slightly by increasing the ionic strength. The presence of tetranitromethane decreased the isopropanol degradation significantly from 85 to 59% over 75 min. This result, combined with the minimal degree of adsorption of isopropanol and acetone onto the surface of the photocatalyst, suggests that the photodegradation pathway occur via free • OH radicals in bulk solution rather than on the catalyst surface.
The aimof this research was to investigate the potential of low- cost locally available stem wate... more The aimof this research was to investigate the potential of low- cost locally available stem water hyacinth (SWH) as an adsorbent for removal of acid green 20 (AG20) as an anionic dye fromaqueous solution. Equilibriumbehavior of SWH was investigated by performing batch adsorption experiments. The effect of initial dye concentration, pH, contact time and adsorbent dose on the adsorption process were evaluated. Adsorption isotherm models, Langmuir (four different forms), Freundlich and Temkin were used to simulate the equilibrium data at different experimental parameters (pH and adsorbent particle size). For Langmuir isotherm model, the four linear equations were discussed and used to obtain the isotherm parameters. Langmuir-II form was found to have the highest coefficient of determination (R2 = 0.999) compared with the other Langmuir linear equations.Also, it was found that SWH has a high adsorptive capacity towards MB dye (200 mg/g) as determined by Langmuir-II model. SWH show favo...
Journal of Hazardous Materials, 2010
Decolorization of the Mordant red 73 (MR73) azo dye in water was investigated in laboratory-scale... more Decolorization of the Mordant red 73 (MR73) azo dye in water was investigated in laboratory-scale experiments using UV/H 2 O 2 and photo-Fenton treatments. Photodegradation experiments were carried out in a stirred batch photoreactor equipped with a low-pressure mercury lamp as UV source at 254 nm. The effect of operating parameters such as pH, [H 2 O 2 ] , [dye] and the presence of inorganic salts (NaNO 3 , NaCl and Na 2 CO 3) were also investigated. The results indicated that complete dye decolorization was obtained in less than 60 min under optimum conditions. Furthermore, results showed that dye degradation was dependent upon pH, [H 2 O 2 ] and initial dye concentration. The presence of chloride ion led to large decreases in the photodegradation rate of MR73 while both nitrate and carbonate ions have a slight effect. The photo-Fenton treatment, in the presence of Fe powder as a source of Fe 2+ ions, was highly efficient and resulted in 99% decolorization of the dye in 15 min. Mineralization of MR73 dye was investigated by determining chemical oxygen demand (COD). In a 3 h photoperiod "65%" of the dye was mineralized by the H 2 O 2 /UV process, while the photo-Fenton treatment was more efficient producing 85% mineralization over the same 3-h period.
The aim of this research was to investigate the potential of low-cost locally available stem wate... more The aim of this research was to investigate the potential of low-cost locally available stem water hyacinth (SWH) as an adsorbent for removal of acid green 20 (AG20) as an anionic dye from aqueous solution. Equilibrium behavior of SWH was investigated by performing batch adsorption experiments. The effect of initial dye concentration, pH, contact time and adsor-bent dose on the adsorption process were evaluated. Adsorption isotherm models, Langmuir (four different forms), Freundlich and Temkin were used to simulate the equilibrium data at different experimental parameters (pH and adsorbent particle size). For Langmuir isotherm model, the four linear equations were discussed and used to obtain the isotherm parameters. Langmuir-II form was found to have the highest coefficient of determination (R 2 = 0.999) compared with the other Langmuir linear equations. Also, it was found that SWH has a high adsorptive capacity towards MB dye (200 mg/g) as determined by Langmuir-II model. SWH show...
A simple route of synthesis of doped ZnO nanoparticles with efficient response to solar light has... more A simple route of synthesis of doped ZnO nanoparticles with efficient response to solar light has always been demanded. Doped ZnO has been applied as a photocatalyst for the degradation of hazardous dyes such as Congo red (CR) dye. In this study, a simple approach for Na-doped ZnO (Na-ZnO) nanoparticles by co-precipitation using NaOH as a precipitating and doping agent was reported. Changing the molar ratio between the moles of NaOH and Zn+2 ions as 3:1 was the main key for this approach. As-prepared Na-ZnO was characterized by different morphological and optical analysis. Na-ZnO confirmed to be solar photocatalyst used for the degradation of aqueous solution of 30 mg/L CR dye with high efficient as 98.9% removal in 70 min under direct sunlight. Moreover, main parameters affecting the photocatalytic degradation of CR dye such as the effect of pH, initial dye concentration and effect of day time on the photodegradation process of CR dye were investigated. In presence of direct sunlig...
Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H 2 O 2 , advanced oxi... more Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H 2 O 2 , advanced oxidation process was investigated in this study. Results show that MR17 dye decolorization rate was mainly effected by different parameters such as solution pH, H 2 O 2 concentration, initial dye concentrations and presence of different inorganic anions such as NO 3 , Cl , CO 3 2ions. The degradation percent of the dye decreased by the presence of inorganic anions in the order of CO 3 2> Cl > NO 3 ions. While increase the temperature of the solution medium from 283 to 318K led to increase the decolorization rate of MR17 dye from 0.048 to 0.164 min. The low value of the apparent activation energy E a (24.91 kJ mol) indicates that decolorization process of MR17 dye is achieved easily using H 2 O 2 /UV process. This results further proved by presence of 100% decolorization of MR17 dye in about 50 min and about 85.57% mineralization in a 3.0 h photoperiod. 2011 Trade Science Inc. INDIA
Mahmoud S.Aboul-Fetouh1, Taha M.Elmorsi1,2*, Jamal M.El-Kady1, Hassan A.El-Adawi1 Chemistry Depar... more Mahmoud S.Aboul-Fetouh1, Taha M.Elmorsi1,2*, Jamal M.El-Kady1, Hassan A.El-Adawi1 Chemistry Department, Faculty of Science, Al-Azhar University, 11884, Cairo, (EGYPT) Chemistry Department, Faculty of Science, Jazan University, Jazan, 706, (KSA) E-mail : taha_elmorsi@yahoo.com Received: 27 June, 2010 ; Accepted: 7 July, 2010 Environmental Science An Indian Journal Trade Science Inc. Volume 5 Issue 4
Photocatalytic properties of photocatalysts depend generally on techniques employed for preparing... more Photocatalytic properties of photocatalysts depend generally on techniques employed for preparing nanostructures and doping processes. Nanostructured zinc oxides (ZnO) are promising photocatalysts due to their high stability, high surface activity, and low costs. This study highlights a simple method of a co-precipitation for synthesizing ZnO and potassium doped ZnO (K-ZnO). In this research, surface functionalization with high quality explored by multiple surface analytical methods such as crystal structural, morphology analysis, inductively coupled plasma-atomic emissions spectroscopy (ICP-AES) and scanning electron microscopy (SEM) attached with energy dispersive x-ray (SEM/EDX). The approach is well suited to produce crystalline K-ZnO, which possesses a shape of nanorods (35.2 to 48.9 nm) and acts as an efficient visible light responsive photocatalyst. The results indicated that the K-ZnO is more responsive to the visible light than pure ZnO. The degradation efficiency of 2-naph...
Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H2O2, advanced oxidati... more Photodegradation of aqueous solution of Mordant red17 (MR17) azo dye in UV/H2O2, advanced oxidation process was investigated in this study. Results show that MR17 dye decolorization rate was mainly effected by different parameters such as solution pH, H2O2 concentration, initial dye concentrations and presence of different inorganic anions such as NO3 -, Cl- , CO3 2- ions. The degradation percent of the dye decreased by the presence of inorganic anions in the order of CO3 2- > Cl- > NO3 - ions.While increase the temperature of the solutionmediumfrom283 to 318K led to increase the decolorization rate ofMR17 dye from0.048 to 0.164min-1. The lowvalue of the apparent activation energy Ea (24.91 kJ mol-1) indicates that decolorization process of MR17 dye is achieved easily using H2O2/UV process. This results further proved by presence of 100% decolorization ofMR17 dye in about 50min and about 85.57%mineralization in a 3.0 h photoperiod.
Journal of Fluorescence
A new turn on fluorescence probe based on 3′,6′-dihydroxy-6-methyl-2-((pyridin-2-ylmethylene)amin... more A new turn on fluorescence probe based on 3′,6′-dihydroxy-6-methyl-2-((pyridin-2-ylmethylene)amino)-4-(p-tolyl)spiro[benzo[f]isoindole-1,9′-xanthen]-3(2H)-one (BFFPH) derived from benzo[f]fluorescein was prepared. Full characterization of the prepared probe using spectroscopic analysis was described such as IR, NMR and MS spectra. The sensitivity of BFFPH for monitoring of pH change in alkaline medium was studied. BFFPH exhibited a high sensitivity to alkaline pH by two pKa values at 8.82 and 10.66 in UV/vis spectroscopy titration. The pH monitoring was studied in broad range of pH values (2.5–12.2) at two pKa values at 8.72 and 10.73 by recording the effect of pH on the fluorescence intensity of BFFPH. The acid-base reversibility character of the probe was investigated as well as the effect of the pH change on the fluorescence quantum yield. The application of the prepared BFFPH probe for detection of living Escherichia coli (E. coli) bacteria using confocal fluorescence microscope was investigated.
Al-Azhar Bulletin of Science, Jun 1, 2011
In present study, the ability of water hyacinths to adsorb Congo red (CR) from aqueous solutions ... more In present study, the ability of water hyacinths to adsorb Congo red (CR) from aqueous solutions were investigated in a fixed-bed column. Effects of important parameters, such as the value of initial pH, existed salt, the flow rate, the influent concentration of CR and bed depth, were assessed. The Thomas model was applied to adsorption of CR at different flow rate, influent concentration to predict the breakthrough curves and to determine the characteristic parameters of the column' suitability for process design using non-linear regression. Bed-depth/service time analysis (BDST) model was also applied at different bed depths to predict the breakthrough curves. The two models were found suitable for describing the biosorption process of the dynamic behavior of the water hyacinths column. Quoted results have suggested that water hyacinths as adsorbent to removal CR from solution be efficient, and the rate of biosorption process be rapid. When the flow rate was 0.5 ml min −1 and the influent concentration of CR was 30 mg l −1 , the equilibrium adsorption biomass reached 109 mg g −1 according to Thomas model.
Zeitschrift für anorganische und allgemeine Chemie
The colorimetric chemosensor 2-((3,5-dichloro-2-hydroxybenzylidene)amino)-3′,6′-dihydroxy-6-methy... more The colorimetric chemosensor 2-((3,5-dichloro-2-hydroxybenzylidene)amino)-3′,6′-dihydroxy-6-methyl-4-(p-tolyl)spiro[benzo[f]isoindole-1,9′-xanthen]-3(2H)-one (BFFSH) derived from benzo[f]fluorescein dye was synthesized. NMR and IR spectroscopy as well as mass spectrometry were used to confirm the compound. BFFSH shows potential application for detecting metal ions in aqueous solution. It displays a colorimetric selectivity and sensitivity towards the aqueous solution of Cu2+ ions with a detection limit in the nano-molar range (1.69 nM). In addition, the application of BFFSH was extended for the detection of Cu2+ ions in real water samples (tap and synthetic water) with a high recovery percentage. Additionally, the association constant (Ka) of BFFSH, which binds with Cu2+ ions based on 2:1 stoichiometry was calculated.
Journal of Environmental Protection
The purpose of this study was to prepare nano-titanium tannate complex (TTC) and to investigate i... more The purpose of this study was to prepare nano-titanium tannate complex (TTC) and to investigate its adsorption capacity for removal of cationic dyes such as crystal violet (CV) dye. The morphology and the main elements of TTC adsorbent were characterized by scanning electron microscopy (SEM-EDS), while its crystal structure was characterized by X-ray diffraction (XRD). Also, FT-IR spectroscopy study structural aspects of TTC. A "cotton-ball"-like and porous surface structure of titanium tannate complex (TTC) with nanoparticle size of 16.18 nm show high capability for absorbing crystal violet dye. The effect of several parameters such as contact time, initial concentrations of CV, solution pH and the amount of TTC was investigated. Three different kinetic equations such as pseudo-first order, pseudo-second order and intraparticle diffusion were used to study the order and the mechanism of the adsorption process. The adsorption of CV dye followed pseudosecond order equation. Moreover, equilibrium data were tested with four adsorption isotherm models namely, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R). Langmuir was the best fit for the data with maximum capacity as 58.8 mg/g. The results of Separation factor, Surface coverage and standard free energy (∆G˚) indicated that adsorption of CV onto TTC was favorable with fast rate and spontaneous physical adsorption process.
Sensors and Actuators B: Chemical
Canadian Journal of Chemistry, 2017
This research aims to use modified ZnO nanoparticles to enhance the removal rate of the methylene... more This research aims to use modified ZnO nanoparticles to enhance the removal rate of the methylene blue (MB) dye. ZnO nanoparticles are modified by coating their surface with Congo red (CR) dye, henceforth referred to as ZnO/CR. This process is used to produce a Lewis acid on the surface of ZnO to attract any Lewis base such as a MB dye (MB+). Therefore, the stability of ZnO/CR improved, and it resists the change in pH value (from 3 to 9). Several analysis techniques such as scanning electron microscopy, X-ray diffraction, FTIR, and BET method were used to characterize ZnO/CR. Nonlinear and linear regressions of pseudo first-order, pseudo second-order, and Elovich models were used to calculate the kinetic parameters of the adsorption process. The best-fit kinetic equation was investigated using three functions of error analysis: the sum of the squares of the errors, chi-square analysis, and the coefficient of determination. The intraparticle diffusion equation was used to study the d...
Small polar organic compounds such as alcohols, ketones and aldehydes are highly soluble and do n... more Small polar organic compounds such as alcohols, ketones and aldehydes are highly soluble and do not adsorb strongly to the TiO2 surface and, therefore, may be fairly resistant to photocatalytic degradation. Photodegradation of an aqueous solution of isopropanol and its resulting photodegradation product acetone was investigated as a function of TiO2 substrate concentrations and solution ionic strength and pH. In the presence of 2g/L TiO2, isopropanol completely disappeared within 3 hrs, resulting in the nearly complete transformation into acetone. Subsequent photodegradation of acetone occurred at a much slower rate and resulted in complete mineralization. Increasing the pH slightly decreased the photodegradation rate. Conversely, the degradation rate was enhanced slightly by increasing the ionic strength. The presence of tetranitromethane decreased the isopropanol degradation significantly. This result, combined with the minimal degree of adsorption of isopropanol and acetone onto the surface of the photocatalyst, suggests that the photodegradation pathway occurs via free OH radicals in bulk solution rather than on the catalyst surface.
Journal of Environmental Protection, 2014
International Journal of …, 2004
The photochemical oxidation of a series of short-chain polychlorinated n-alkane (PCA) mixtures wa... more The photochemical oxidation of a series of short-chain polychlorinated n-alkane (PCA) mixtures was investigated using H 2 O 2 /UV and modified photo-Fenton conditions (Fe 3+ /H 2 O 2 /UV) in both Milli-Q and lake water. All PCA mixtures, including chlorinated (Cl 5 to Cl 8) decanes, undecanes, dodecanes and tridecanes degraded in 0.02 M H 2 O 2 /UV at pH 2.8 in pure water, with 80 ± 4% disappearance after 3 h of irradiation using a 300 nm light source. Degradation was somewhat enhanced under similar conditions but in natural water. The modified photo-Fenton system was more effective in degrading PCAs, with 72% and 80% disappearance of chlorinated decanes in 45 min of irradiation in pure and natural water, respectively. Carbon chain-length had minimal effect on degradation rates; however, increased degree of chlorination (from Cl 5 to Cl 8) resulted in slower initial degradation rates and less complete conversion after 3 h of irradiation. Three hours of irradiation in natural water/H 2 O 2 /UV resulted in 95% degradation of parent PCAs accompanied by 93% release of chloride ion. Quantitative dechlorination, which may be indicative of complete mineralization, suggests that this is an effective water remediation technique for PCAs.