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化工学报  2014 

高通量聚醚砜纳滤膜的制备及对染料浓缩脱盐

DOI: 10.3969/j.issn.0438-1157.2014.10.030, PP. 3968-3975

Keywords: 纳滤,脱盐,废水,抗污染

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Abstract:

以聚醚砜(PES)为膜材料,以嵌段式聚醚PluronicF127为添加剂,利用特制刮膜设备通过相转化法制备出高通量PES/PluronicF127复合纳滤膜,并将其用于染料的浓缩脱盐。研究了添加剂含量、溶剂蒸发温度和蒸发时间对膜结构和膜性能的影响,考察了不同操作压力和操作温度下膜对染料的分离性能。扫描电镜(SEM)、接触角、孔隙率数据和蛋白吸附测试结果表明,PluronicF127改善了膜孔结构,提高了孔隙率,并且显著提高了膜的抗污染性能。纯水通量、截留率以及膜表面孔径表征结果表明,当PluronicF127含量为3%、溶剂蒸发温度为90℃、蒸发时间为18s时,膜的分离性能最佳。在0.6MPa下该膜对低分子量染料的截留率可达99.9%,且通量达到110.2L·m-2·h-1,对NaCl的截留率仅为5.5%。在12h的染料浓缩脱盐中,膜对染料的通量维持在较高水平且截留率始终保持在99%左右,具有良好的稳定性和抗污染性。

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