第 48 卷第 4 期 Vol. 48 No. 4 2018 年 8 月 Aug 2018

所属栏目：功能材料 Cu2+印迹壳聚糖／聚乙烯醇膜的制备及其吸附性能研究

杨振彦1，2，李巧玲1，2* （1.中北大学 理学院，山西 太原 030051；2.农产品产地环境监测北京市重点实验室，北京农业质量标准与检测技术研究中心，北京市农林科学院，北京 100097）

摘　要：基于壳聚糖对金属离子的螯合机理，同时采用离子印迹法和共混法改性壳聚糖膜，制备了Cu2+印迹壳聚糖／聚乙烯醇膜（CS（Cu2+）／PVA），并研究了其对Cu2+的吸附性能。利用SEM、FT-IR对其进行表征，并探讨了各因素对吸附效果的影响，结果表明：当PVA添加量为7.5%，Cu2+初始浓度为100 mg·L-1，吸附剂添加量为0.01 g，pH=5.00时，CS（Cu2+）／PVA对Cu2+的吸附量最大，为182.1 mg·g-1，是壳聚糖膜（CS）吸附量的1.9倍。吸附在90 min内达到平衡，吸附等温线既符合Langmuir模型，也符合Freundlich模型。吸附动力学符合拟二阶动力学模型。3次循环使用后，吸附量仍可达到102.7 mg·g-1。在有Pb2+存在的混合溶液中，其对Cu2+的吸附量为150.39 mg·g-1，是对Pb2+吸附量（22.14 mg·g-1）的7倍，表现出优异的吸附选择性。

关键词：壳聚糖膜；离子印迹法；共混法；Cu2+；PVA；吸附

中图分类号：TQ317.4　　文献标识码：A　　文章编号：1009-9212（2018）04-0042-05

Preparation of Cu2+ Imprinted Chitosan/Polyvinyl Alcohol Membrane and Its Adsorption Properties

YANG Zhen-yan1,2, LI Qiao-ling1,2* (1. School of Science, North University of China, Taiyuan 030051, China; 2. Key Laboratory of Production Environmental Monitoring of Agricultural Products in Beijing, Beijing Research Center for Agricultural Standards and Testing, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China)

Abstract：Based on the chelating mechanism of chitosan on metal ions, chitosan/polyvinyl alcohol membranes containing Cu2+ template (CS(Cu2+))/PVA) were prepared by ion-imprinting and blending. Its adsorption properties for Cu2+ were studied. The membrane was characterized using SEM and FT-IR. The influence of various factors on the adsorption effect was discussed. The experimental results showed that CS(Cu2+)/PVA had the maximum adsorption capacity of Cu2+, and the largest adsorption amount was 182.1 mg·g-1, which was 1.9 times of chitosan membrane under following conditions: the PVA content was 7.5%; the initial concentration of Cu2+ was 100 mg·L-1; the amount of adsorbent was 0.01 g; and the pH was 5. The adsorption reached equilibrium within 90 min. The adsorption isotherm conformed to both the Langmuir model and the Freundlich model. The adsorption kinetics conformed to a pseudo second-order kinetic model. After three cycles, the adsorption capacity still remained at 102.7 mg·g-1. In the mixed solution containing Pb2+, its adsorption capacity for Cu2+ was 150.39 mg·g-1, which was 7 times higher than that of Pb2+ (22.14 mg·g-1), showing an excellent adsorption selectivity.

Key words：chitosan membrane; ion blotting; blending; Cu2+; PVA; adsorption

基金项目：国家自然科学基金项目（51272239，20871108），山西省回国留学人员科研资助项目（2014-重点6）。

作者简介：杨振彦（1994-），女，山西忻州人，硕士研究生，研究方向：高分子膜水处理研究（E-mail：m15934117699@163.com）。

联 系 人： 李巧玲，教授，研究方向：纳米功能材料研究（E-mail：qiaolingl@163.com）。

收稿日期： 2018-08-1