【摘要】 以壳聚糖为原料、甲基丙烯酰氧乙基三甲基氯化铵(DMC)为接枝单体、硝酸铈铵为引发剂、Span-80为乳化剂、戊二醛(GA)为交联剂,通过反相乳液聚合技术制备了壳聚糖-DMC-GA共聚物,对其进行表征并将其用于吸附水溶液中单一金属离子Cr(Ⅵ)、Cd(Ⅱ)和双元体系Cr(Ⅵ)-Cd(Ⅱ),考察了吸附动力学和吸附平衡规律。共聚物的红外光谱和X射线光电子能谱分析表明:壳聚糖与DMC发生了接枝反应,与戊二醛发生了交联反应。吸附实验结果表明:在单一金属离子溶液中,共聚物对1 mmol/L的Cr(Ⅵ)和Cd(Ⅱ)的平衡吸附量分别为1.974和1.396 mmol/g;在双元体系中,共聚物对1 mmol/L的Cr(Ⅵ)和Cd(Ⅱ)的平衡吸附量分别为1.906和1.204 mmol/g;吸附过程均符合拟二级动力学方程,吸附等温线均与Langmuir模型更为一致,说明共聚物对2种金属离子的吸附是单分子层吸附。更多还原

【Abstract】 With chitosan as the raw material,methylacryloyloxyethyl trimethyl ammonium chloride( DMC) as grafting monomer,ammonium cerium nitrate as the initiator,Span-80 as the emulsifier,glutaraldehyde( GA) as the crosslinking agent,the chitosanDMC-GA copolymer was prepared through inverse emulsion polymerization. It was used to adsorb single ions Cr( Ⅵ) and Cd( Ⅱ)and the dual system Cr( Ⅵ)-Cd( Ⅱ). The adsorption kinetics and adsorption equilibrium were explored. The results of FT-IR and XPS analysis of copolymer showed that DMC and GA reacted with chitosan successfully,and the adsorption capacities of single ions Cr( Ⅵ) and Cd( Ⅱ)( 1 mmol/L) were 1. 974 and 1. 396 mmol/g. In the dual system,the adsorption capacities of Cr( Ⅵ) and Cd( Ⅱ) were 1. 906 and 1. 204 mmol/g,and the adsorption processes of single ions Cr( Ⅵ) and Cd( Ⅱ) and the dual system Cr( Ⅵ)-Cd( Ⅱ) all followed the pseudo-second-order kinetics. The adsorption isotherms were all well described by the Langmuir equation. This meaned that the adsorption was monolayer adsorption.更多还原