聚乙烯亚胺接枝壳聚糖基六价铬印迹衍生物的制备及其选择吸附性能  

Preparation of polyethyleneimine grafted chitosan based Cr (Ⅵ)-imprinted derivative and selective adsorption ability thereof

作　　者：徐一平 郭牧林 蔡伟成[2,3] 周永璋 XU Yiping;GUO Mulin;CAI Weicheng;ZHOU Yongzhang(College of Environmental Science and Engineering,Nanjing Tech University,Nanjing 211816,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Research Center on New Materials in Hydraulic Structures,Ministry of Water Resources,Nanjing 210029,China)

机构地区：[1]南京工业大学环境科学与工程学院,江苏南京211816 [2]南京水利科学研究院,江苏南京210029 [3]水利部水工新材料工程技术研究中心,江苏南京210029

出　　处：《化工环保》2022年第5期598-603,共6页Environmental Protection of Chemical Industry

基　　金：中央级公益性科研院所专项资金重点项目(Y420006)。

摘　　要：以壳聚糖(CTS)微球为基材,通过定向接枝将多胺高分子树枝状聚乙烯亚胺(PEI)修饰于CTS结构,并通过离子印迹改性方法制得PEI接枝CTS基Cr(Ⅵ)印迹衍生物(I-CTS-PEI)。优化了制备工艺条件:在第一步Schiff碱合成中甲苯为最优溶剂;第二步戊二醛复合溶液预反应最佳条件为V_(戊二醛)∶m_(PEI)=1∶1(L/g),反应时间30 min,反应温度50℃;在Cr(Ⅵ)印迹改性过程中,交联剂环氧氯丙烷最佳用量为8 mL。表征结果显示,Cr(Ⅵ)是通过静电引力吸附在I-CTS-PEI表面。当I-CTS-PEI交联度为84%时,Cr(Ⅵ)选择吸附性最大。Using chitosan(CTS)microspheres as substrate,dendrimer polyethyleneimine(PEI),a kind of polyamine polymer,was modified on CTS structure by directional grafting,and the PEI grafted CTS based Cr(Ⅵ)imprinted derivative(I-CTS-PEI)was prepared by ion imprinting method.The optimized preparation conditions are as follows:Toluene is the best key solvent in the first step of Schiff base synthesis;In the second step of prereaction in glutaraldehyde-PEI composite solution,the optimum conditions are V_(glutaraldehyde)∶m_(PEI)=1∶1(L/g),reaction time 30 min and reaction temperature 50℃;In the process of Cr(Ⅵ)imprinting modification,the optimum amount of the crosslinking agent Epichlorohydrin is 8 mL.The characterization results show that Cr(Ⅵ)is adsorbed on the surface of I-CTS-PEI by electrostatic attraction.When the crosslinking degree of I-CTS-PEI is 84%,the selective adsorption of Cr(Ⅵ)is the highest.

关 键 词：壳聚糖 聚乙烯亚胺 离子印迹 Cr(Ⅵ) 

分 类 号：X703.1[环境科学与工程—环境工程]