The Adsorption of Pb2+ and Cu2+ onto Gum Ghatti-Grafted Poly(acrylamide-co-acrylonitrile) Biodegradable Hydrogel: Isotherms and Kinetic Models
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- 作者：Hemant Mittal ; Arjun Maity ; Suprakas Sinha Ray
- 刊名：Journal of Physical Chemistry B
- 出版年：2015
- 出版时间：February 5, 2015
- 年：2015
- 卷：119
- 期：5
- 页码：2026-2039
- 全文大小：584K
- ISSN：1520-5207
文摘
A biodegradable hydrogel polymer of gum ghatti (Gg) with a copolymer mixture of acrylamide (AAm) and acrylonitrile (AN) was synthesized using the free-radical graft copolymerization technique. The effect of graft copolymerization on the surface area of Gg was studied using BET analyses. The graft copolymerization of Gg with poly(AAm-co-AN) was characterized using Fourier transform infrared spectroscopy, CHN analysis, thermogravimetric analysis, atomic force microscopy, and scanning electron microscopy. The adsorption of Pb2+ and Cu2+ from aqueous solution using the Gg-cl-P(AAm-co-AN) hydrogel polymer was studied in batch mode. The adsorption process was found to be highly pH dependent, and the maximum adsorption efficiency was observed at pH 5.0 for both metal ions. The adsorption isotherm data were analyzed by applying five different isotherm models, namely, the Langmuir, Freundlich, Temkin, Flory鈥揌uggins, and Dubinin鈥揔aganer鈥揜adushkevich isothermal models. The Langmuir model was found to fit well with the experimental isotherm data, with a maximum adsorption capacity of 384.6 and 203.7 mg/g for Pb2+ and Cu2+, respectively. The metal ion-adsorption process was found to be controlled by the pseudo-second-order rate model. The Gg-cl-P(AAm-co-AN) hydrogel polymer retained its original adsorption capacity for three successive cycles of adsorption鈥揹esorption. In summary, the potential for remediating industrial wastewater polluted by metal ions using the biodegradable Gg-cl-P(AAm-co-AN) hydrogel polymer has been demonstrated.