核桃壳接枝聚合物的制备及其吸附性能  

Preparation and Adsorption Property of Walnut Shell Grafted Polymer

作　　者：叶庆龄 陈潇琪 妥小军 常玥[1,2,3] 査飞 YE Qing-ling;CHEN Xiao-qi;TUO Xiao-jun;CHANG Yue;ZHA Fei(College of Chemistry ＆ Chemical Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China;Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, Lanzhou 730070, Gansu, China;Key Laboratory of Polymer Materials of Gansu Province, Lanzhou 730070, Gansu, China)

机构地区：[1]西北师范大学化学化工学院,甘肃兰州730070 [2]生态环境相关高分子材料教育部重点实验室,甘肃兰州730070 [3]甘肃省高分子材料重点实验室,甘肃兰州730070

出　　处：《精细化工》2018年第7期1221-1226,共6页Fine Chemicals

基　　金：国家自然科学基金项目(21161017)~~

摘　　要：以核桃壳、2-溴异丁酰溴制备的核桃壳大分子化合物为引发剂,Fe Cl3·6H2O/PPh3、VC为催化体系,采用电子活化再生原子转移自由基聚合（AGET ATRP）法制备了核桃壳接枝聚丙烯酰胺（核桃壳-g-PAM）、聚甲基丙烯酸甲酯（核桃壳-g-PMMA）两种复合材料。利用红外光谱、差热分析及扫描电镜对复合材料的结构和形貌进行了表征。结果表明：两种复合材料对水中Pb（Ⅱ）、Cu（Ⅱ）的吸附量均高于核桃壳。293 K时,10 mg核桃壳-g-PAM、核桃壳-g-PMMA对pH=5、50 mg/L Pb（Ⅱ）的吸附量分别为40.5、53.7 mg/g,吸附机理均符合拟二级动力学模型,等温吸附过程可用Langmuir方程较好地描述。核桃壳-g-PAM、核桃壳-g-PMMA再生4次对Pb（Ⅱ）的最低解吸率分别为93.4%、93.1%,表明核桃壳复合材料具有较好的再生能力。Two composite materials, walnut shell grafted polyacrylamide and walnut shell grafted poly（methyl methacrylate） were prepared via activators generated by electron transfer for atom transfer radical polymerization（AGET ATRP） by using walnut shell macroinitiator as initiator in a catalytic system of Fe Cl3·6 H2 O/PPh3 and Vc, in which walnut shell macroinitiator was prepared with walnut shell and 2-bromoisobutyryl bromide. The structure and morphology of composite materials were characterized by FTIR, TG and SEM. The results indicated that the adsorption capability of Pb（Ⅱ） and Cu（Ⅱ） from aqueous solution by both walnut shell grafted polyacrylamide and walnut shell grafted poly（methyl methacrylate） was higher than that of walnut shell. The maximum adsorption capacity was 40.5 mg/g and 48.5 mg/g, respectively, at 293 K and pH 5 when initial Pb（Ⅱ） concentration was 50 mg/L. Kinetic and isotherm studies of Pb（II） revealed that adsorption process followed the pseudo-second-order kinetic model and the Langmuir isotherm equation. After 4 times of regeneration, the minimum desorption rate of Pb（Ⅱ） by walnut shell grafted polyacrylamide and walnut shell grafted poly（methyl methacrylate） was 93.4% and 93.1%, respectively, indicating that the composite materials had better regeneration capacity.

关 键 词：核桃壳 原子转移自由基聚合 复合材料 吸附 水处理技术 

分 类 号：TQ085.412[化学工程]