采用戊二醛(GA)为交联剂,硫酸(H2SO4)为催化剂,通过层层自组装技术制备交联改性的PDDA(聚二甲基二烯丙基氯化铵)/CMCNa(羧甲基纤维素钠)聚电解质复合膜.用SEM(扫描电镜)观察交联改性前后膜表面的形貌变化;考察交联剂和催化剂浓度对相对交联度及其纳滤截留性能的影响.结果表明,交联改性后膜表面更加光滑致密;当GA质量分数为1.0％,H2SO4质量分数为0.30％,交联时间24 h,交联温度30℃时,制备的复合膜分离性能最优;在25℃和0.60 MPa的操作条件下,交联改性(PDDA/CMCNa)2.0-PAN复合膜对0.4 mg/L罗丹明B溶液的截留率为94％,通量为46 L/(m2·h·MPa);与未交联改性复合纳滤膜相比,交联改性复合纳滤膜在组装层数减小的情况下,在提高复合膜截留率的同时保持了较高的通量.
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