自组装杂化离子通道膜的构筑及阳离子传输机制

doi:10.6023/A1109098

化学学报 ›› 2012, Vol. 70 ›› Issue (02): 170-176.DOI: 10.6023/A1109098 上一篇下一篇

研究论文

自组装杂化离子通道膜的构筑及阳离子传输机制

张信信^a,b, 王丽华^b,c, 贠延滨^a

a 北京林业大学环境科学与工程学院北京100083;
b 中国科学院化学研究所新材料实验室北京 100190;
c 天津工业大学中空纤维膜材料与膜过程省部共建国家重点实验室培育基地天津 300160

投稿日期:2011-09-09 修回日期:2011-11-30 发布日期:2012-02-25
通讯作者: 王丽华 E-mail:wanglh@iccas.ac.cn
基金资助:
国家自然科学基金(No.20704041);国家重点基础研究发展计划(973 计划)(No.2009CB623407)资助项目.

Construction of Self-Organized Hybrid Ion Channel Membrane and Cationic Transport Mechanism

Zhang Xinxin^a,b, Wang Lihua^b,c, Yun Yanbin^a

a College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083;
b Laboratory of New Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190;
c State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300160

Received:2011-09-09 Revised:2011-11-30 Published:2012-02-25
Supported by:
Project supported by the National Nature Science Foundation of China (No.20704041) and National Program on Key Basic Research Project (No. 2009CB623407).

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摘要/Abstract

以3-异氰酸丙基三乙氧基硅烷和对甲氧基苯胺为原料合成了一种可以自组装形成有机-无机杂化材料的化合物——3-(脲基-4-甲氧基苯基)丙基三乙氧基硅烷. 采用FT-IR, ¹H NMR, DSC 和XRD 分析方法对该化合物的结构以及结晶性进行了表征. 将该化合物与聚乙烯醇(PVA)共混, 利用化合物的自组装性质构筑结构均一且致密无孔的离子通道杂化膜, 通过自制的膜运输实验装置测定膜对阳离子的传输性能并提出了相应的传输机制. SEM 照片显示, 自组装杂化膜致密无缺陷, 膜厚度为8 μm. 选择5 种阳离子进行运输实验测试, 结果表明, 自组装杂化离子通道膜对一价的碱金属离子Li⁺, Na⁺和K⁺有很好的传输功能, 这要归功于杂化材料中甲氧基苯基与碱金属阳离子形成的阳离子-π相互作用力. 碱金属阳离子在膜中的扩散过程可由溶解-扩散机制来解释, 结果显示, Li⁺, Na⁺和K⁺在杂化膜中传输的渗透率大小为: P_Na⁺ > P_K⁺ > P_Li⁺ , 说明本研究中的的自组装杂化离子通道膜对Na⁺有优先选择性. 杂化离子通道膜对二价的Ca²⁺和Mg²⁺没有传输作用, 此结果给一二价阳离子的分离带来很好的研究思路.

关键词: 自组装, 离子通道, 杂化膜, 阳离子

A kind of compound which could form hybrid organic-inorganic material-3-(ureido-4-methoxyphenyl)propyltriethoxysilane was obtained from 3-isocyanatopropyltriethoxysilaneand p-anisidine. The structure and the crystallinity of the compound were characterized by FT-IR, ¹H NMR, DSC, and XRD methods. According to the self-assembling property of the compound, the ion channel hybrid membrane with the homogeneous structure was obtained by blending the compound and polyvinyl alcohol (PVA). Next, the cation transport properties of the membrane were tested by our self-made device, and the transport mechanism was proposed. SEM revealed that the ion channel hybrid membrane was dense and defect free. The thickness of the membrane was 8 μm from the SEM images of cross section. Five kinds of cations were chosen for membrane transport experiments. The results demonstrated that the self-organized hybrid ion channel membrane could transport monovalent Li⁺, Na⁺and K⁺, which was attributed to the cation-π interaction with the methoxyphenyl moiety. The process of alkali cationic transport across membrane was explained with the dissolution-diffusion mechanism. The results showed that the permeability of Li⁺, Na⁺and K⁺transport through the hybrid membrane followed the order P_Na⁺ > P_K⁺ > P_Li⁺, which revealed that the self-organized hybrid ion channel membrane reported in this paper preferred to transport Na⁺. Besides the hybrid membrane could not transport divalent Ca²⁺and Mg²⁺. The result can provide new membrane materials for the separation of monovalent ions and divalent ions.

Key words: self-organization, ion channel, hybrid membrane, cation

引用此文

张信信, 王丽华, 贠延滨. 自组装杂化离子通道膜的构筑及阳离子传输机制[J]. 化学学报, 2012, 70(02): 170-176.

Zhang Xinxin, Wang Lihua, Yun Yanbin. Construction of Self-Organized Hybrid Ion Channel Membrane and Cationic Transport Mechanism[J]. Acta Chimica Sinica, 2012, 70(02): 170-176.

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自组装杂化离子通道膜的构筑及阳离子传输机制

Construction of Self-Organized Hybrid Ion Channel Membrane and Cationic Transport Mechanism

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