Abstract

BACKGROUND:The incorporating of zeolites or porous fillers into polymer membranes can improve the pervaporation separation properties of membranes. But the effect mechanism of zeolites or porous fillers on membrane properties needs to be further studied.
OBJECTIVE: The study was designed to prepare ZSM-5 zeolite incorporated chitosan membrane by solution blending method to investigate the effects of zeolite on membrane pervaporation properties.
DESIGN: A controlled observation.
SETTING: Dalian Institute of Chemical Physics, Chinese Academy of Sciences.
MATERIALS: This study was performed at the Laboratory of New Type Membrane Separation Technology, Dalian Institute of Chemical Physics, Chinese Academy of Sciences in May 2006. Chitosan, with deacetylation degree of 75%-85%, was obtained from Sigma-Aldrich Chemical Company, USA; Dimethyl carbonate (DMC), with purity of 99%, was purchased from Fluka Chemical Company, USA; ZSM-5 zeolite was kindly supplied by Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China; Methanol, with purity > 99.5%, were purchased from Shenyang Lianbang Chemical Company, China.
METHODS: ZSM-5 zeolite incorporated chitosan membranes were prepared by solution blending method.
MAIN OUTCOME MEASURES: ① Swelling and sorption of ZSM-5 zeolite-incorporated chitosan membranes in the DMC/methanol mixture. ② Effects of zeolite content in the membrane and operating temperature on pervaporation properties.
RESULTS: Scanning electron microscope demonstrated that zeolite was uniformly distributed in the membrane matrix and the membranes were free from possible defects. The separation selectivity of dimethyl carbonate (DMC)/methanol mixtures was dominated by solubility selectivity rather than diffusivity selectivity. Swelling degree increased and the permeation flux of the membranes increased significantly with the zeolite content increasing. From the temperature-dependent permeation values, the Arrhenius activation parameters were estimated.
CONCLUSION: The pervaporation results indicated that the membranes incorporated with the ZSM-5 zeolite exhibited better separation properties for DMC/methanol mixtures comparing with homogeneous chitosan membranes.

1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, China; 2 Graduate School of Chinese Academy of Sciences, Beijing 100049, China

Liu Bing-bing☆, Doctor, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China
ymcao@dicp.ac.cn

Correspondence to: Cao Yi-ming, Doctor, Researcher, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, China

Supported by: the Major State Basic Research Developmental Program of China (973 Program), No. 2003CB615730*

Received: 2008-01-17 Accepted: 2008-02-01 (08-50-1-476/M)

Liu BB, Cao YM, Yuan Q.Preparation and characterization of ZSM-5 zeolite incorporated chitosan membrane. Zhongguo Zuzhi Gongcheng Yanjiu yu Linchuang Kangfu 2008;12(14): 2765-2769(China)
[www.zglckf.com/zglckf/ejournal/upfiles/ 12-14/14k-2765
(ps).pdf]

ZSM-5分子筛填充壳聚糖膜的制备及性能*☆

摘要
背景：有机高分子膜中添加无机物可以改善渗透汽化膜性能，但添加物对物料渗透膜的影响及其相关机理尚需进一步的研究。
目的：采用液相共混的方法制备了ZSM-5分子筛填充壳聚糖膜。考察了填充膜中分子筛对渗透汽化膜分离性能的影响。
设计：对比观察实验。
单位：中国科学院大连化学物理研究所。
材料：实验于2006-05在中国科学院大连化学物理研究所新型膜分离技术实验室完成。壳聚糖，脱乙酰度为75%~85%，购自美国Aldrich Chemical Company；碳酸二甲酯购自美国Fluka公司，纯度99%；ZSM-5分子筛由大连化学物理研究所提供；甲醇由沈阳市联邦试剂厂提供，纯度>99.5%。
方法：用液相共混的方法制备ZSM-5分子筛填充壳聚糖膜。
主要观察指标：①填充膜在碳酸二甲酯/甲醇混合液中的溶胀和吸附行为。②填充膜分子筛含量及操作温度对渗透汽化膜分离性能的影响。
结果：①扫描电镜表征表明分子筛在膜中分散均匀，膜表面没有明显缺陷。②膜优先吸附甲醇，其分离性能主要由溶解过程控制。③随着膜中分子筛含量的增加，膜的溶胀度增大，渗透通量大幅度提高。④渗透通量与操作温度符合Arrhenius关系式。
结论：ZSM-5分子筛填充壳聚糖膜渗透汽化分离甲醇/碳酸二甲酯混合物，大大提高了壳聚糖膜的渗透通量，渗透汽化分离指数远远大于壳聚糖均质膜，具有良好的分离效果。
关键词：ZSM-5分子筛；壳聚糖；渗透汽化；碳酸二甲酯；甲醇；材料改性；生物材料

刘兵兵1,2，曹义鸣1，袁 权1
1中国科学院大连化学物理研究所，辽宁省大连市 116023；2中国科学院研究生院，北京市 100049
刘兵兵☆，男，1982年生，河南省洛阳市人，汉族，2008年中国科学院大连化学物理研究所毕业，博士，主要从事渗透汽化膜的制备及性能研究。
中国科技部，国家“九七三”计划资助项目（2003CB615703）*
通讯作者：曹义鸣，研究员，博士，中国科学院大连化学物理研究所，辽宁省大连市 116023

中图分类号: R318.08 文献标识码: A 文章编号: 1673-8225(2008)14-02765-05
刘兵兵，曹义鸣，袁权.ZSM-5分子筛填充壳聚糖膜的制备及性能[J].中国组织工程研究与临床康复，2008，12(14):2765-2769
[www.zglckf.com/zglckf/ejournal/upfiles/12-14/14k-2765(ps).pdf]
(Edited by Li L/Song LP/Wang L)