Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt.
National Center for Radiation Research & Technology, Cairo, Egypt.
Int J Biol Macromol. 2018 Dec;120(Pt B):2188-2199. doi: 10.1016/j.ijbiomac.2018.06.171. Epub 2018 Jul 17.
The removal of industrial pollutants from wastewater is important to protect human health and the environment. For this reason, bifunctional hydrogel was synthesized by radiation-induced grafting copolymerization of 2-acrylamido-2-methylpropane-1-sulphonic acid (AMPS) and dimethylaminoethyl methacrylate (DMAEMA) onto starch and subsequent chemical modification of the prepared hydrogel by benzyl chloride. The physical and chemical properties of the hydrogel AMPS co DMAEMA modified with ion-exchange groups were investigated by FT-IR, DSC and SEM techniques. The modified copolymers were examined for the removal of basic dyes, cobalt ions, and phosphate anions from aqueous solution. The maximum adsorption capacities of dye, cobalt and phosphate ions were 600 mg/g, 350 mg/g, and 650 mg/g, respectively at the optimum conditions. The adsorption of dye, Co ions, and phosphate anions onto the hydrogel obeyed both Langmuir and Freundlich models. The adsorption kinetics of dye was found to follow closely the pseudo-first-order kinetic model rather than the pseudo-second-order kinetic model. The kinetic study of Co ions adsorption indicates that it obeys pseudo-second-order kinetic model rather than pseudo-first order one.
从废水中去除工业污染物对于保护人类健康和环境至关重要。出于这个原因，通过辐射引发的 2-丙烯酰胺-2-甲基丙磺酸（AMPS）和二甲氨基乙基甲基丙烯酸酯（DMAEMA）接枝共聚到淀粉上，随后用氯化苄对制备的水凝胶进行化学改性，合成了双功能水凝胶。通过傅里叶变换红外光谱（FT-IR）、差示扫描量热法（DSC）和扫描电子显微镜（SEM）技术研究了具有离子交换基团的水凝胶 AMPS 共 DMAEMA 的物理和化学性质。研究了改性共聚物从水溶液中去除碱性染料、钴离子和磷酸盐阴离子的性能。在最佳条件下，染料、钴和磷酸盐离子的最大吸附容量分别为 600mg/g、350mg/g 和 650mg/g。染料、Co 离子和磷酸盐阴离子在水凝胶上的吸附同时符合 Langmuir 和 Freundlich 模型。染料的吸附动力学更符合拟一级动力学模型，而不是拟二级动力学模型。Co 离子吸附的动力学研究表明，它符合拟二级动力学模型，而不是拟一级动力学模型。
