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科技导报  2015 

原位离子交联聚电解质络合物纳滤膜的制备与表征

DOI: 10.3981/j.issn.1000-7857.2015.14.016, PP. 87-92

Keywords: 聚电解质络合物,纳滤膜,原位离子交联,水软化

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Abstract:

为获得高渗透选择性的聚电解质络合物纳滤膜(PECNFMs),以聚乙烯亚胺(PEI),海藻酸钠(SA)和羧甲基纤维素钠(CMC)为原料,通过原位离子交联的方式制备了一系列新型PECNFMs。分别采用傅里叶变换红外光谱(ATR-FTIR),场发射扫描电镜(SEM)和接触角实验(CA)对PECNFMs的化学组成、结构和亲水性进行表征。考查聚电解质的配比、聚阴离子的种类、无机盐的种类及操作温度等因素对PECNFMs性能的影响。结果表明,当PEI质量比相同时,PEI/SA原位离子交联PECNFMs较PEI/CMC膜具有更高的水通量;且随着PEI质量比的增加,PECNFMs的荷电性由荷负电转变为荷正电;当PEI质量比为0.9时(PEI/SA0.9)具有最佳的纳滤分离性能,其对MgCl2的截留率为94.0%,水通量为13.4L·m-2·h-1(在25℃和0.6MPa下,对1g·L-1MgCl2水溶液进行测试),表现出较高的Na+/Mg2+分离性能(分离因子为10.4)。采用原位离子交联法,成功制备了高渗透选择性的新型PECNFMs,该方法具有一定的普适性,为高性能纳滤膜的制备开辟了新途径。

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