One-step dynamic assembly of polyelectrolyte complex membranes
One-step dynamic assembly of polyelectrolyte complex membranes
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聚电解质复合膜的一步动态组装
DOI：
10.1016/j.msec.2009.02.015
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发表时间：
2009-08
影响因子：
7.9
通讯作者：
Gao, Xue
中科院分区：
文献类型：
--
作者：
Ji, Shulan;Zhang, Guojun;Liu, Zhongzhou;Gao, Xue
在过去的几十年中，基于带相反电荷的聚电解质（PE）静电吸附的逐层（LbL）组装技术一直是组装超薄膜最常用的工艺之一。然而，LbL 工艺也被认为是一个耗时的工艺，特别是对于致密膜的组装。本文开发了一种基于静电吸附的一步动态组装方法来制备PE复合膜。壳聚糖（CS）作为模型聚阳离子，在选定的压力下动态沉积在带负电荷的水解聚丙烯腈（PAN）支撑膜上，形成PE复合膜，用于水-乙醇混合物的渗透汽化分离。与传统的浸涂方法相比，这种新的组装工艺具有一些优点，例如用稀溶液形成选择性层，易于用于不同类型的膜组件并适合大规模应用。研究了动态压力、CS分子量和CS浓度等组装条件。合适的组装条件为：动压，0.2MPa； CS分子量，82,000； CS 浓度为 0.5 wt.%。在渗透蒸发 95 wt.% 乙醇/水混合物的情况下，CS 聚电解质复合膜的分离因子和渗透通量分别为 422 和 230 g/(m2h) (60 °C)。随后进行用戊二醛和硫酸的交联处理。结果发现，通过交联处理，分离性能得到改善。最后，还成功探索了采用一步动态组装渗透汽化脱水的内皮中空纤维PE复合膜。所提出的工艺将为获得相对完整的PE复合膜提供一种新方法。
During the past decades, layer-by-layer (LbL) assembly technique based on electrostatic adsorption of oppositely charged polyelectrolytes (PEs) has been one of the most frequently utilized processes for assembling ultra-thin film. However, LbL process is also recognized as a time-consuming process, especially for assembly of dense membranes. In this paper, a one-step dynamic assembly based on electrostatic adsorption was developed to prepare the PE complex membranes. The chitosan (CS), used as a model polycation, was dynamically deposited on a hydrolyzed polyacrylonitrile (PAN) support membrane with negative charges under a selected pressure to form a PE complex membrane for pervaporation separation of water–ethanol mixture. Compared with traditional dip-coating method, this new assembly process could offer some advantages such as the formation of selective layer with dilute solution, easily used for different membrane module types and suitable for large scale applications. The assembly conditions such as dynamic pressure, CS molecular weight, and CS concentration were investigated. The appropriate conditions for assembly were: dynamic pressure, 0.2 MPa; CS molecular weight, 82,000; and CS concentration, 0.5 wt.%. In the case of pervaporation of 95 wt.% ethanol/water mixtures, the separation factor and the permeate flux of the CS polyelectrolyte complex membranes were 422 and 230 g/(m2h) (60 °C), respectively. The cross-linking treatment with glutaraldehyde and sulfuric acid were subsequently performed. It was found that the separation performance was improved by the cross-linking treatment. Finally, inner skin hollow fiber PE complex membranes were also successfully explored using one-step dynamic assembly for pervaporation dehydration. The proposed process will offer a new approach to obtain a relatively integrated PE complex membrane.
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影响因子：
9.5
作者：
H. Yanagishita;D. Kitamoto;K. Haraya;T. Nakane;T. Okada;H. Matsuda;Y. Idemoto;N. Koura
通讯作者：
H. Yanagishita;D. Kitamoto;K. Haraya;T. Nakane;T. Okada;H. Matsuda;Y. Idemoto;N. Koura
影响因子：
2.8
作者：
A. Ahmad;B. .. Ooi;J. P. Choudhury
通讯作者：
A. Ahmad;B. .. Ooi;J. P. Choudhury
DOI：
10.1016/s0928-4931(02)00189-3
发表时间：
2002-12
期刊：
Materials Science and Engineering: C
影响因子：
--
作者：
A. Toutianoush;B. Tieke
通讯作者：
A. Toutianoush;B. Tieke
影响因子：
--
作者：
L. Ge;Xing Wang;Long Ba;Zhongze Gu
通讯作者：
L. Ge;Xing Wang;Long Ba;Zhongze Gu
DOI：
10.1016/j.msec.2005.03.008
发表时间：
2006
期刊：
Materials Science and Engineering: C
影响因子：
--
作者：
Zhaoqi Zhu;Xian-she Feng;A. Penlidis
通讯作者：
Zhaoqi Zhu;Xian-she Feng;A. Penlidis