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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and Monovalent Selective Properties of Multilayer Polyelectrolyte Modified Cation-Exchange Membranes
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Preparation and Monovalent Selective Properties of Multilayer Polyelectrolyte Modified Cation-Exchange Membranes

机译：多层聚电解质改性阳离子交换膜的制备及一价选择性能

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摘要

This study reports the modification of commercial cation-exchange membrane by layer-by-layer adsorption of polyethyleneimine and poly(acrylic acid) (PAA) to endow them with monovalent ion selectivity. The chemical and morphological changes of the modified membrane surface were examined by ATR-FTIR and SEM, respectively. The permselectivity for monovalent cations of the membranes was investigated by electrodialysis experiments. The effects of deposited bilayer number, the salt concentration, and pH of the dipping polyelectrolyte solutions on selectivity were investigated. Meanwhile, the resistance of membranes was measured taking energy consumption into consideration. The polyelectrolyte multilayer was crosslinked using epichlorohydrin to improve stability, and the durability of the composite membrane was studied. Separation mechanism of the composite membrane was also investigated. It is demonstrated that the bivalent cations are mainly rejected by electrostatic repulsion from the positive charge on the surface of the composite membranes. The sieving effect of the dense structure of skin layer becomes more pronounced with the number of deposited layers increased. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41488.
机译：这项研究报道了通过对聚乙烯亚胺和聚丙烯酸（PAA）进行逐层吸附以使其具有单价离子选择性的方法，对商用阳离子交换膜进行了改性。分别通过ATR-FTIR和SEM观察了改性膜表面的化学和形态变化。通过电渗析实验研究了膜单价阳离子的渗透选择性。研究了沉积的双层数，盐浓度和浸渍聚电解质溶液的pH值对选择性的影响。同时，考虑到能量消耗来测量膜的电阻。使用表氯醇使聚电解质多层交联以提高稳定性，并研究了复合膜的耐久性。还研究了复合膜的分离机理。已经证明，二价阳离子主要被复合膜表面上的正电荷通过静电排斥而排斥。随着沉积层数的增加，表层致密结构的筛分效果变得更加明显。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41488。

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