层层自组装界面聚合技术制备复合正渗透膜

Preparation of composite positive permeable membrane by layer-by-layer self-assembly interface polymerization technology

以聚醚砜为膜材料,聚乙烯醇为亲水改性剂,聚多巴胺为交联剂,采用热致相分离法制备了负载聚多巴胺层的聚醚砜基膜;再以间苯二胺为水相单体,均苯三甲酰氯为油相单体,利用层层自组装界面聚合技术可制备复合正渗透膜。结果表明:将基膜依次在聚阳和聚阴离子电解质溶液中各反应15 min,然后浸泡于去离子水中5 min,所制备的复合正渗透膜的水通量最高(28.2 L/h),盐反通量较低(3.9 g/h),膜的过滤性能最好。

The polyethersulfone based membrane supported by polydopamine layer was prepared by thermally-induced phase separation technology with polyethersulfone as the membrane material,pol-yvinyl alcohol as the hydrophilic modifier,and polydopamine as the cross-linking agent.The com-posite positive permeable membrane could be ob-tained by layer-by-layer self-assembly interface polymerization technology with the m-phenylene as water phase monomer and the tribenzoyl chloride as oil phase monomer.The results showed that when the based membrane was successively reacted in the polycationic and polyanion electrolyte solution for 15 min,and then soaked in deionized water for 5 min,the prepared composite positive permeable membrane had the highest water flux(28.2 L/h)and a lower salt reverse flux(3.9 g/h),and the fil-tration performance of membrane was the best.