半-IPN羧甲基纤维素/聚(丙烯酰胺-共-甲基丙烯酸钠)水凝胶制备及其吸附性能

羧甲基纤维素(CMC)水溶液中,通过自由基共聚制备半-互穿网络(IPN)羧甲基纤维素(CMC)/聚(丙烯酰胺-共-甲基丙烯酸钠)(poly(AAm-co-NMR))水凝胶。研究CMC含量对半-IPN水凝胶溶胀率及对甲基紫的吸附性能影响。IPN-0.25、IPN-0.50和IPN-1.00对甲基紫的平衡吸附容量分别为111.0、182.3和237.6 mg/g。分别采用拟一级、拟二级和粒内扩散模型拟合实验数据,结果表明,拟二级动力学模型最符合该体系,其相关系数R2最高,说明水凝胶对甲基紫的吸附主要为化学吸附。

Fabrication of semi-IPN carboxymethyl cellulose/poly(acrylamide-co-sodium methacrylate) hydrogel and its adsorption behavior

Semi-interpenetrating network(IPN) hydrogels carboxymethyl cellulose(CMC)/poly(acrylamide-co-sodium methacrylate) were synthesized by free radical copolymerization of acrylamide(AAm) and sodium methacrylate(NMR) in aqueous solution of carboxymethyl cellulose. The effects of CMC content on swelling ratio of semi-IPN hydrogels and adsorption of methyl violet were investigated. The equilibrium adsorption capacity of IPN-0.25, IPN-0.50 and IPN-1.00 for methyl violet adsorption were 111.0, 182.3 and 237.6 mg/g, respectively. The pseudo-first-order, pseudo-second-order and intra-particle diffusion equations were adopted to examine the mechanism of the adsorption process. The adsorption process is more accord with pseudo-second-order kinetic model, which indicates that chemical adsorption is dominant.