Nanofiltration using pore-filled membranes: effect of polyelectrolyte composition on performance
Nanofiltration using pore-filled membranes: effect of polyelectrolyte composition on performance
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DOI：
10.1016/s1383-5866(00)00172-6
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发表时间：
2001-03
影响因子：
8.6
通讯作者：
R. F. Childs;A. M. Mika;A. Pandey;Christopher T. C. McCrory;S. Mouton;J. M. Dickson
中科院分区：
文献类型：
--
作者：
R. F. Childs;A. M. Mika;A. Pandey;Christopher T. C. McCrory;S. Mouton;J. M. Dickson
制备了几个系列的聚丙烯微孔膜，考察了不同组成的聚电解质对膜的纳滤膜性能的影响。膜由两种不同的路线，涉及无论是在原位化学交联的聚（4-乙烯基吡啶）或聚（乙烯基苄基氯），或通过原位聚合的丙烯酸与四（乙二醇）二丙烯酸酯或N，N-亚甲基双丙烯酰胺作为交联剂在基板的孔。所得的孔填充膜的特征在于在孔中的水的浓度（体积分数），离子交换容量（电荷密度），水含量，和厚度。在压力下测试不同系列的膜以确定它们的流体动力学渗透率和盐分离性能（NaCl）。结果发现，有一个很好的相关性之间的流体动力学（达西）渗透率和凝胶聚合物浓度，保持在填孔凝胶中的凝胶聚合物化学无关。具有不同孔隙填充凝胶的膜，无论是带正电荷还是带负电荷，都遵循相同的关系。的膜的分离性能是非常好的，盐的排斥率被认为是几乎恒定的在很宽的范围内的渗透率（凝胶浓度）。人们还发现，在约0.2 mmol/cm 3以上的溶胀凝胶的标称电荷密度的增加对凝胶填充膜的分离性能的影响可以忽略不计。本研究结果为进一步设计和优化用于纳滤膜的填料填充膜提供了依据。
Several series of membranes composed of microporous poly(propylene) substrates filled with polyelectrolyte gels of different chemical structure, polymer concentration and charge densities have been prepared in order to examine the effect of polyelelctrolyte composition on the performance of these membranes in nanofiltration. The membranes were made by two different routes involving either in situ chemical cross-linking of poly(4-vinylpyridine) or poly(vinylbenzyl chloride), or by in situ polymerization of acrylic acid with tetra(ethylene glycol) diacrylate or N,N-methylenebisacrylamide as cross-linking agents in the pores of the substrates. The resulting pore-filled membranes were characterized by the concentration (volume fraction) of the polyelectrolyte in the pores, ion exchange capacity (charge density), water content, and thickness. The different series of membranes were tested under pressure to determine their hydrodynamic permeabilities and salt separation properties (NaCl). It was found that there was a good correlation between hydrodynamic (Darcy) permeability and gel polymer concentration that holds irrespective of the gel polymer chemistry in the pore-filling gels. Membranes with different pore-filling gels, whether positively or negatively charged, followed the same relationship. The separation properties of the membranes are very good and the salt rejection was found to be practically constant over a wide range of permeabilities (gel concentrations). It was also found that the increase in the nominal charge density above approximately 0.2 mmol/cm3of the swollen gel had a negligible effect on the separation properties of the gel-filled membranes. The results of this study provide a basis for the further design and optimization of polyelectrolyte filled membranes for nanofiltration applications.