Liu Li-Fen, Wu Hao, Li Rui-Han, Yu Chun-Yang, Zhao Xue-Ting, Gao Cong-Jie
Center for Membrane and Water Science and Technology, Ocean College, Zhejiang University of Technology Hangzhou 310014 China
Collaborative Innovation Center of Membrane Separation and Water Treatment of Zhejiang Province Hangzhou 310014 China.
RSC Adv. 2018 Nov 12;8(66):37817-37827. doi: 10.1039/c8ra04906h. eCollection 2018 Nov 7.
A novel reverse osmosis (RO) composite membrane, poly(amide-urethane-imide@Ag) (PAUI@Ag), was prepared on a polysulfone supporting film through two-step interfacial polymerization. First, in the 1st interfacial polymerization procedure, a new tri-functional crosslinking agent with -OCOCl and -COCl groups, 5-choroformyloxyisophaloyl chloride (CFIC), was reacted with 4-methyl-phenylenediamine (MMPD) without curing treatment to obtain the poly(amide-urethane) base membrane with a CFIC-MMPD precursor separation layer. And then ,'-dimethyl--phenylenediamine (DMMPD) with nano-Ag particle dispersion was introduced onto the base membrane to further construct a CFIC-DMMPD modified ultrathin separation layer the 2nd interfacial polymerization. Thus, the PAUI@Ag RO membrane with poly(amide-urethane-imide) bi-layer skin was obtained. The membrane was characterized for the chemical composition of separation layer, the membrane cross-section structure and the membrane surface morphology. Permeation experiment was employed to evaluate the PAUI@Ag membrane performance including salt rejection rate and water flux. The results revealed that the PAUI@Ag membrane composed the highly cross-linked separation layer with entire ridges and valleys, small surface roughness, and well dispersed nano-Ag particles. Upon exposure of the membranes to high concentration of free chlorine solutions, the PAUI@Ag RO membrane showed a slightly less chlorine-resistant property compared with the nascent PAUI RO membrane, but was still superior to the conventional polyamide MPD-TMC RO membrane, meanwhile it processed higher anti-biofouling property.
通过两步界面聚合在聚砜支撑膜上制备了一种新型反渗透（RO）复合膜聚（酰胺 - 聚氨酯 - 酰亚胺@银）（PAUI@Ag）。首先，在第一步界面聚合过程中，将一种带有 -OCOCl 和 -COCl 基团的新型三官能团交联剂 5 - 氯甲酰氧基间苯二甲酰氯（CFIC）与 4 - 甲基苯二胺（MMPD）反应，不进行固化处理，以获得具有 CFIC - MMPD 前体分离层的聚（酰胺 - 聚氨酯）基膜。然后，将含有纳米银颗粒分散体的间苯二甲胺（DMMPD）引入到基膜上，通过第二步界面聚合进一步构建 CFIC - DMMPD 改性超薄分离层。由此，获得了具有聚（酰胺 - 聚氨酯 - 酰亚胺）双层皮层的 PAUI@Ag RO 膜。对该膜的分离层化学成分、膜横截面结构和膜表面形态进行了表征。采用渗透实验评估了 PAUI@Ag 膜的性能，包括脱盐率和水通量。结果表明，PAUI@Ag 膜由高度交联的分离层组成，具有完整的脊谷结构、较小的表面粗糙度和分散良好的纳米银颗粒。当将膜暴露于高浓度游离氯溶液中时，PAUI@Ag RO 膜与新生的 PAUI RO 膜相比，耐氯性能略差，但仍优于传统的聚酰胺 MPD - TMC RO 膜，同时具有更高的抗生物污染性能。
