支化聚氮杂环丙烷强化壳聚糖基六价铬印迹材料的制备及其选择性吸附性能  

Study on the Adsorption of Chromium Ions by Chitosan-Based Imprinted Derivatives Enhanced by Polyamines

作　　者：张玉银 郭牧林 周永璋 蔡伟成 ZHANG Yuyin;GUO Mulin;ZHOU Yongzhang;CAI Weicheng(Nanjing Tech University,School of Environmental Science and Engineering,211816;Ministry of Water Resources,Ministry of Transport,National Energy Bureau,Nanjing Hydraulic Research Institute,Materials&Structural Engineering Eepartment,Nanjing,China 210029)

机构地区：[1]南京工业大学环境科学与工程学院,211816 [2]水利部交通运输部国家能源局南京水利科学研究院材料结构研究所,江苏南京210029

出　　处：《水处理技术》2024年第4期77-82,共6页Technology of Water Treatment

基　　金：中央级公益性科研院所专项资金重点项目(Y420006)。

摘　　要：基于多孔羧甲基壳聚糖(CMCS),将多胺高分子支化聚氮杂环丙烷(B-PI)接枝修饰,并通过离子印迹改性方法制备六价铬(Cr(Ⅵ))吸附材料(Ⅱ-CMCS-g-B-PI),研究其制备过程中关键参数的“构-效”关系,并对复杂混合溶液中Cr(Ⅵ)选择吸附性能进行考察。结果表明:在接枝过程中,添加1.5 mL的3-氨丙基三乙氧基硅烷且V戊二醛:MB-PI为1时能有效提升B-PI接枝效率,增大Cr(Ⅵ)吸附量;当控制交联度在94.4%时,Ⅱ-CMCS-g-B-PI相对于未印迹改性材料的Cr(Ⅵ)相对选择性提高39.8%,混合溶液中Cr(Ⅵ)吸附量128.3mg/g;Ⅱ-CMCS-g-B-PI对纯Cr(Ⅵ)溶液和混合溶液的吸附行为均符合准二级动力学模型及Langmuir等温吸附模型,热力学参数表明吸附过程是自发的、吸热且无序度增大。This study based on porous carboxymethyl chitosan(CMCS),Branched polyethyleneimine(B-PI),a kind of Polyamine polymer,was grafted and modified,and Cr(Ⅵ)adsorption material(II-CTS-PEI)was prepared by ion imprinting method.The structure-activity relationship of key parameters in the preparation process was studied.The selective adsorption properties of Cr(VI)in complex mixed solution were investigated.The results showed that the grafting efficiency of B-PI and the adsorption capacity of Cr(VI)could be improved effectively when 1.5 mL 3-aminopropyl triethoxy silane was added and Vglutaraldehyde:MB-PI was 1.When the control degree of crosslinking was 94.4%,the selectivity of II-CMCS-g-B-PI increased by 39.8%compared with Cr(VI)of unimprinted modified materials.The adsorption behavior of II-CMCS-g-B-PI on pure Cr(VI)solution and mixed solution accords with the quasi second-order kinetics model and Langmuir isothermal adsorption model.Thermodynamic parameters indicate that the adsorption process is spontaneous and endothermic.

关 键 词：壳聚糖 吸附材料 离子印迹 Cr(Ⅵ) 

分 类 号：X703.1[环境科学与工程—环境工程]