交联改性PDDA/CMCNa复合纳滤膜的研究
作者:秦振平13,郭红霞23,任晓燕 ,3,杜子昂13,纪树兰13,张国俊13,刘燕4
单位: 1.北京工业大学环境与能源工程学院;2. 北京工业大学材料科学与工程学院,10024 3. 北京市绿色催化与分离重点实验室,100124 4. 北京科泰兴达高新技术有限公司北京,102403
关键词: 复合纳滤膜;层层自组装;交联改性
出版年,卷(期):页码: 2016,36(4):19-23

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了交联改性的PDDA/CMCNa聚电解质复合膜。SEM观察了交联改性前后膜表面的形貌变化;考察了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浓度为1.0wt%, H2SO4浓度为0.30wt%,交联时间为24h,交联温度为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%,单位压力下的通量为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。
 The cross-linked PDDA/CMCNa polyelectrolyte complex membrane has been fabricated by layer-by-layer self-assembly method, using glutaraldehyde (GA) as crosslinking agent and sulfuric acid (H2SO4) as catalyst. The membrane surface was characterized by SEM in comparison with that of the non-crosslinked membrane. The effect of crosslinking agent and sulfuric acid concentration on relative crosslinking degree and nanofiltration performance of the (PDDA/CMCNa)2.0-PAN composite membrane were also investigated. The results showed that: when GA crosslinking agent concentration was 1.0wt%, and the catalyst H2SO4 concentration was 0.3wt%, cross-linking at 30℃ temperature for 24h, the obtained cross-linked (PDDA/CMCNa)2.0-PAN composite membrane showed 94% retention ratio for Rhodamine B along with the flux of 46 L/(m2•h•MPa) under unit pressure 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 number of assembly layers.
第一作者简介:秦振平(1964-),男,陕西省府谷县人,副教授;研究方向为膜科学与化工分离技术 * 联系人:郭红霞,e-mail:hxguo@bjut.edu.cn 电话010-67396110

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