基于界面聚合法在受限空间内诱导合成反渗透/纳滤复合膜的研究

Interfacial polymerization in constricted zone to induced reverse osmosis and nanofiltration membranes oriented synthesis

一种新的概念,受限空间内的界面聚合,用于研究反渗透膜(RO)/纳滤膜(NF)复合膜的合成。实验设计使用受保护的多胺单体通过延迟扩散与均苯三甲酰氯反应,获得了过渡态结构的RO/NF膜。在NF膜水相配方中加入大分子模板剂,诱导界面反应在受限空间内定向发生,将聚合物网络的聚集态由无序转变为有序,同时NF膜对盐的截留性能不变,水通量提高一倍。RO膜有机相配方中加入纳米分子筛,提升水通量超过50%,复合膜表面结构呈现NF膜的特性,同时脱盐性能保持不变。

Herein,we report a new concept,constricted interfacial polymerization to study the formation of polyamide thin film composite membranes. Delayed diffusion of protected polyfunctional amine reacts with acyl chloride to produce a transition surface structure. Hydro philic macromolecules and amphiphilic template induced interfacial polymerization reacted in a limited zone,the aggregation state of polymer chains transform from a random state to a regu lar stateand membrane permeability increases without a loss of salt rejection. Zeolite nanoparti cles dispersed in reverse osmosis （RO） composite membrane changed film morphology and wa ter permeability is increased nearly 50%with equivalent salt rejection.