序构分离-吸附膜对多组分污染物的去除

传统的膜分离难以实现低压下多组分污染物的同步去除。通过错流灌装的方式将沸石咪唑酯骨架结构材料ZIF-8灌装到非对称超滤膜分离层下的指状孔内，制备了序构分离-吸附双功能膜（DFUM），并开展了其对水中复合污染物同步去除性能的研究。在不改变原始膜结构与截留性能的基础上，DFUM内ZIF-8纳米粒子的负载量可达到2.87 mg/cm2。以腐植酸与Cu2+为模型污染物，考察其在多种污染物共存体系的去污性能，结果显示:在0.16 MPa压力和45 L/（m2·h）通量工况下，先分离后吸附的序构设计可同步去除HA和Cu2+，去除率分别为95.4%和97%，Cu2+的去除性能不受共存的腐植酸影响；与表面沉积的方式相比，DFUM对废水中Cu2+的有效去除体积可提高3倍。研究可为水中多组分污染物的低压同步去除提供新的策略。

SEQUENTIAL SEPARATION-ADSORPTION MEMBRANE FOR REMOVAL OF MULTI-COMPONENT POLLUTANTS

Traditional membrane separation is unable to achieve simultaneous removal of multiple pollutants under low pressure. In this paper, the sequenced separation-adsorption dual-function ultrafiltration membrane(DFUM) was prepared by immobilizing ZIF-8 into the finger-like pores of the asymmetric ultrafiltration membrane for multiple pollutants simultaneous removal. Without changing the original membrane structure and retention performance of DFUM, the loading capacity of ZIF-8 nanoparticles could reach 2.87 mg/cm2. The decontamination performance results showed that the sequenced structure could simultaneously remove humic acid and Cu2+ with removal rate of 95.4% and 97%, at a pressure of 1.6 bar and a flux of 45 L/(m2·h) and protected the process of Cu2+ removal from the interference of the coexisted humic acid; compared with the method of surface deposition, the effective removal volume of Cu2+ could be increased by three times by the DFUM. This study provided a novel strategy for excellent removal of multiple pollutants in water.