【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.更多还原

【Abstract】 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（H₂SO₄）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）2.0-PAN composite membrane were investigated.The results showed that when GA crosslinking agent mass fraction was 1.0%,and the catalyst H₂SO₄ mass fraction was 0.3%,cross-linking at 30 ℃for24h,the obtained cross-linked（PDDA/CMCNa）2.0-PAN composite membrane showed 94% retention ratio for Rhodamine B with the flux of 46L/（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 2.0assembly layers.更多还原