Synthesis and Evaluation of the Ability of Poly(Methacrylic Acid-co-acrylamide)/nanoclay Composite Hydrogel in the Adsorption of Methylene Blue Dye (original) (raw)
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2021
One of the major environmental problems is the entry of colored pollutants into the oceans and seas. Adsorption is one of the effective methods to eliminate colorant polluting materials from wastewater streams. In this study, nanocomposite hydrogels of poly(methacrylic acid-co-acrylamide) (Poly(MAA-co-AAm)) containing different weight percent bentonite clay nanoparticles (0, 5, 10, and 15 wt. %) were used to remove methyl violet (MV) dye. FTIR, SEM, TGA, and XRD were used to analyze the properties of adsorbents. Results showed that bentonite nanoparticles were successfully distributed in the hydrogel system. Bentonite nanoparticles at 10 wt. % gave the maximum MV dye adsorption efficiency. The highest adsorption was obtained at a pH of 5, an adsorbent dosage of 1.5 g/L, a temperature of 25°C, a contact time of 60 min, and a pollutant concentration of 10 mg/L. In thermodynamics studies, a negative values of Gibbs free energy (ΔG°) indicating that the adsorption process was spontaneou...
Hybrid hydrogel networks synthesized by the simple free radical polymerization of acrylamide, acrylamidoglycolic acid and cloisite sodium clay. To synthesize these hybrid hydrogels N,N'methylenebisacrylamide used as a cross linker and ammonium peroxydisulphate used as an initiator. The structural characterization of this poly(acrylamide-co-acrylamidoglycolic acid/cloisite hybrid hydrogels (PAAGC), were done using Fourier transform infrared spectroscopy. The resulting hybrid networks was used as an adsorbent for studying the effectiveness in the removal of methylene blue (MB), which is having a wide range of use in different fields such as biology and chemistry. The effects of contact time, initial sorbate concentration, pH, and dose of adsorbent were studied to optimize the adsorption capacity. The batch sorption technique employed, revealed a maximum adsorption. Adsorption isotherms and Kinetic models were fitted to know the adsorption mechanism. This Hybrid hydrogels exhibited excellent performance in MB adsorption. The investigations demonstrated that the PAAGC can be based as an efficient adsorbent for the removal of MB from aqueous solution.
International Journal of Environmental Sciences, 2012
In this work poly(methacrylic acid) hydrogels were prepared by free radical aqueous polymerization of methacrylic acid(MAc) using N,N'-methylene bisacrylamide (MB) as crosslinker and potassium persulfate (KPS) as initiator. The hydrogels were characterized by FTIR and TG analysis. The gels exhibited pH-dependent swelling behavior, with equilibrium percent mass swellings of about 110 and 403 at pH 1.0 and 7.4 respectively. The swelling exponent, n, was found to be 0.31 and 0.59 respectively, thus indicating a diffusion controlled and chain relaxation controlled swelling at these pH values respectively. The equilibrium adsorption of a cationic dye Methylene Blue (MB) was studied at 25 0 C using the Langmuir and the Freundlich adsorption isotherm models. The maximum sorption capacity Q 0 was found to be 169.43 mg/g. The equilibrium dye uptake was found to increase with the pH of the adsorbate medium and attained an optimum value of 77.8 mg/g for the initial dye concentration of 200 mg/L at 25 0 C at pH 5.2. The adsorption showed negative temperature dependency thus suggesting exothermic nature of the adsorption process. Finally, the various thermodynamic parameters were also evaluated.
Iranian Journal of Environmental Health Science & Engineering, 2010
Dye removal from wastewater has received considerable attention with several classes of dye being investigated. Methylene blue has wide applications and can cause some harmful effects in humans. The use of clean technology of low-priced and biodegradable absorbents could be a good tool to minimize the environmental impact caused by dye manufacturing and textile effluents.The present study deals with the preparation of a novel sIPN (semi interpenetrating) hydrogel composed of copolymer of acrylamide and acrylicacid with poly vinyl alcohol as linear polymer there in. The adsorption abilities of hydrogels with different molar ratios for removal of methylene blue from aqueous solutions were investigated. A weighed quantity of dry hybrid hydrogel was immersed in 50 ppm MB solution and kept at 37 o C. The amount of MB adsorbed was measured spectrophotometrically (λ= 661.6 nm) in periodically taken solution samples. The maximum dye adsorption concentration for hydrogel composites was 95% a...
Journal of Colloid and Interface Science, 2006
This article concerns the removal of Methylene Blue (MB) dye using nano-poly Acrylonitrile (PAN) and hydroximated nano-poly Acrylonitrile (HPAN) particles prepared by precipitation polymerization technique. The effect of the process variables including contact time, pH, initial dye concentration and temperature on the adsorption characters for PAN and HPAN was studied. The removal percentage varied from 100% to 60% with MB concentration ranged from 5 to 50 ppm. A significant difference was observed at 15 to 20 ppm where the removal percentage was found 70% and 90% for PAN and HPAN, respectively. No significant effect was observed of variation adsorption temperature from 30 o C to 70 o C or pH variation from 5 to 9. On the other hand, the polymerization and hydroximation processes of Acrylonitrile were studied. The conversion yield (%) was affected significantly by initiator concentration and polymerization temperature and varied from 2% to 80%. Particle size increased from 130 to 210 nm as a result of hydroximation process. Additional proves for occurrence of hydroximation process was obtained from thermo gravimetric analysis (TGA) and infrared spectrometer analysis (FT-IR). Irregular shape of polymer particles was indicated by scanning electron microscope (SEM) photographs.
Journal of Polymers and The Environment, 2020
An anionic, low-cost, and environmentally friendly composite PVA/Agar/Bentonite (PAB) hydrogel was prepared via selfassembly method, then evaluated as an adsorbent for both cationic methylene blue (MB) and anionic Congo red (CR) dyes using static (batch adsorption) and dynamic (column filtration) procedures. The structural/textural and morphological features of the hydrogel were investigated by X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, zeta potential measurements and scanning electronic microscopy. The nonlinear forms of first-order and second-order kinetic model, and nonlinear forms of Langmuir-Freundlich, Redlich-Peterson, Langmuir and Freundlich isotherm model were used to study the equilibrium adsorption. The adsorption kinetics of MB and CR dyes onto composite hydrogel followed the nonlinear form of pseudo-second-order model with the adsorption capacity of 107.45 and 42.05 mg/g, respectively. The equilibrium data were fitted well to the nonlinear Langmuir-Freundlich model for MB dye and nonlinear form of Langmuir model for CR dye, which were confirmed by R 2 , MSE and EABS values. Using the column purification method, the composite hydrogel PAB promotes the removal of the MB and CR pollutants by maintaining the concentrations of the filtrate solutions below 0.1 mg/L, even when the volume of the dye reaches 20 mL.
Poly(2-acrylamido-2-methyl-1-propanesulfonic acid-co-1-vinylimidazole), hydrogels were synthesized via free radical polymerization reaction at different conditions and modified with di-alkyl halide. P(AMPS-Na +co-VIm)-Ag and p(AMPS-H +-co-VIm)-Ag were prepared by reducing Ag(CH 3 COO) salts loaded into p(AMPS-Na +-co-VIm) and p(AMPS-H +co-VIm) hydrogels and then reduced by NaBH 4. Metal nanoparticles embedded p(AMPS-Na +-co-VIm)-Ag and p(AMPS-H +-co-VIm)-Ag were visualized by high resolution X-ray photoelectron spectroscopy (HRXPS) and transmission electron microscopy (TEM). The prepared porous hydrogels and related composites were utilized in the adsorption of Rhodamine B from aqueous solutions. Among non-quaternized hydrogels, p(AMPS-Na +-co-VIm) and its composite outperformed p(AMPS-H +co-VIm) and p(AMPS-H +-co-VIm)-Ag. since high porosity increases absorption capacity, which depends on the size and shape of the pores. In addition, the effect of 1,4-dibromobutane quaternization on the catalytic performance of nano-composites was investigated. Finally, the catalyst was easily recovered from the reaction medium and re-used for a further four runs without significant loss of activity. The durability of the catalyst structure without leaching was confirmed by FT-IR spectra and atomic absorption spectroscopy, respectively.
Polymers
The use of some hydrogels as adsorbents for pollutants removal from wastewater is limited due to their high swelling properties and the difficulty in recovering them after the adsorption process. To overcome these problems, a new hydrogel nanocomposite based on chitosan-grafted-polyacrylic acid/oxidized electrospun carbon nanofibers (CT-g-PAA/O-ECNFs) was prepared by an in situ grafting polymerization process. The prepared hydrogel nanocomposite was used as a novel effective and highly reusable adsorbent for the removal of methylene blue (MB) from polluted water with low cost. The morphology and the structure of CT-g-PAA/O-ECNFs were investigated by numerous techniques. The effect of incorporating O-ECNFs on the swelling capability of the prepared hydrogel was explored in distillated water and MB solution at normal pH. The effect of parameters including ratio of O-ECNFs, contact time, pH, initial concentration, and temperature on adsorption process were explored. The adsorption isot...
Polymer Bulletin, 2011
The present study examined the use of ghassoul, natural clay available in large quantities under the Atlas Mountains in Morocco, for the removal of the basic dye, methylene blue, from aqueous solutions. The effect of initial dye concentrations, agitation time, pH and temperature on adsorption capacities of methylene blue was investigated. The initial pH of the aqueous solution and the change of temperature (25-55 °C) were found to have little effect on the adsorption process. The adsorption was a rapid with 90-99% of the dye removed within the first 10-20 min. The adsorption kinetics are described successfully using a pseudo-second order rate equation and the rate constant decreases with increasing the initial concentration of MB. Experimental and calculated kinetic data for equilibrium are well expressed by Langmuir isotherm. The equilibrium adsorption capacity of ghassoul was determined with the Langmuir equation as well as the pseudo-second-order rate equation and found to be >290 mg dye per gram of the adsorbent. The results indicate that ghassoul could be employed as a low cost alternative to commercial activated carbon in wastewater treatment for the removal of colour and dyes.
Poly(acrylamide/laponite) nanocomposite hydrogels: Swelling and cationic dye adsorption properties
Journal of Applied Polymer Science, 2009
Super adsorbent polyacrylamide (PAAm)/ nanoclay (laponite, Lap) hydrogels were prepared by in situ free radical polymerization of AAm in an aqueous solution with clay as a crosslinker. The swelling properties and water-soluble cationic dye adsorption behaviors of the PAAm/laponite (PAAm/Lap) nanocomposite (NC) hydrogels were investigated. The parameters of swelling and diffusion of water in dye solutions were evaluated for the PAAm/Lap NC hydrogels. The adsorption behavior of the monovalent cationic dyes such as Basic Blue 12 (BB 12), Basic Blue 9 (BB 9), and Basic Violet 1 (BV 1), were studied on the NC hydrogels. The effects of the clay content of the hydrogel on its cationic dye uptake behavior were studied. The adsorption studies indicated that the rates of dye uptake by the NC hydrogels increased in the follow-ing order: BB 9 > BB 12 > BV 1. This order is similar to the swelling results of the PAAm/Lap NC hydrogel in the dye solutions. The equilibrium uptakes of the different dyes by the PAAm/Lap NC hydrogel were nearly the same. In the dye absorption studies, S-type adsorption in the Giles classification system was found for the BB 12 and BV 1 dyes, whereas L-type was observed for the BB 9 dye. After the heat treatment of PAAm/Lap, the rate of dye uptake and equilibrium dye uptake were increased. The NC hydrogels may be considered as a good candidate for environmental applications to retain more water and to remove dyes.