中文摘要：

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24h,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0.4mg/L罗丹明B溶液的截留率为94%,通量为46L/（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.

英文摘要：

A cross-linked polydiallyldimethyl ammonium chloride/sodium carboxymethyl cellulose （PDDA/ CMCNa） polyelectrolyte composite membrane was fabricated by layer-by-layer self-assembly method on polyacrylonitrile（PAN） ultrafiltration membrane using glutaraldehyde （GA） as crosslinking agent and sulfuric acid （H2 SO4） as catalyst. The membrane surface was characterized by SEM （scanning electron microscope） in comparison with that of non-crosslinked membrane. The effects of crosslinking agent and sulfuric acid concentration on relative crosslinking degree and nanofiltration performance of the （PDDA/ CMCNa）a0-PAN composite membrane were investigated. The resu!ts showed that when GA crosslinking agent mass fraction was 1.0%, and the catalyst HzSO4 mass fraction was 0. 3%, cross-linking at 30℃ for 24 h, the obtained cross-linked （PDDA/CMCNa）a0-PAN composite membrane showed 94% retention ratio for Rhodamine B with the flux of 46 L/（m2 · h · MPa） at 25 ℃. Compared to the non-crosslinked composite membrane, the crosslinked composite nanofiltration membrane showed an improved rejection rate and flux, with just 2. 0 assembly layers.