The salt-, pH- and oxidant-responsive pervaporation behaviors of weak polyelectrolyte multilayer membranes
The salt-, pH- and oxidant-responsive pervaporation behaviors of weak polyelectrolyte multilayer membranes
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DOI：
10.1016/j.memsci.2010.03.002
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发表时间：
2010-05
影响因子：
9.5
通讯作者：
Naixin Wang;Guojun Zhang;S. Ji;Zhen-ping Qin;Zhong-zhou Liu
中科院分区：
文献类型：
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作者：
Naixin Wang;Guojun Zhang;S. Ji;Zhen-ping Qin;Zhong-zhou Liu
层-层（LbL）组装的多层膜最近被认为是一类新的有前途的膜材料，用于各种分离用途。然而，人们对分离混合物对吸附的聚电解质的影响缺乏了解。因此，对其有一个清晰的认识，对于新型功能复合膜的设计和应用具有重要意义。本文在负压条件下，将弱聚电解质聚乙烯亚胺和聚丙烯酸构筑在水解聚丙烯腈中空纤维支撑膜上。分别用氯化钠、盐酸、氢氧化钠和次氯酸钠水溶液对膜进行后处理，考察了膜的盐响应性、pH响应性和氧化剂响应性渗透汽化行为。比较了后处理前后渗透汽化膜分离乙醇/水的性能。扫描电子显微镜和原子力显微镜证实了膜表面的微观形貌变化。光学显微镜也被用来实时观察沉积在石英衬底上的多层膜的表面形貌。最后，通过对比后处理前后内表面的zeta电位值，也说明了表面电性能的变化。
The layer-by-layer (LbL) assembled polyelectrolyte multilayer has recently been recognized as a new class of promising membrane material for various separation uses. However, there is a lack of understanding about the influences of separation mixtures on the adsorbed polyelectrolytes. Therefore, clear understanding on it would be very important for the design and application of a type of new functional composite membrane. In this paper, the multilayer of weak polyelectrolytes polyethyleneimine and polyacrylic acid was constructed onto a hydrolyzed hollow fiber polyacrylonitrile support membrane under a negative pressure condition. The salt-, pH- and oxidant-responsive pervaporation behaviors of polyelectrolyte multilayer membranes were evaluated by post-treating with sodium chloride, hydrochloric acid, sodium hydroxide and sodium hypochlorite aqueous solutions, respectively. The pervaporation performances for separation of ethanol/water were compared before and after post-treatments. Scanning electron microscopy and atomic force microscopy confirmed the microtopographical changes of membrane surfaces. Optical microscopy was also used to real-time observe surface morphologies of polyelectrolyte multilayers deposited on the quartz substrates. Finally, the comparison of zeta potential values of inner surface before and after post-treatment also demonstrated the changes of surface electrical property.