原位法合成二氧化钛制备纳米复合纳滤膜  

Composite Nanofiltration Membranes Prepared by In-situ Synthesized TiO_2

作　　者：王恕皆 周勇[1] 

机构地区：[1]浙江工业大学膜分离与水科学技术中心,浙江杭州310014

出　　处：《水处理技术》2017年第12期74-77,共4页Technology of Water Treatment

摘　　要：采用钛酸四丁酯(TBOT)作为钛源,并与均苯三甲酰氯(TMC)溶解于油相中,与哌嗪(PIP)水相单体发生界面聚合反应的同时原位生成二氧化钛,制得新型聚哌嗪酰胺-TiO_2复合纳滤膜,对其性能和表面结构进行测试和表征,并且与直接在水相和油相中添加TiO_2纳米颗粒的2种复合膜进行对比。结果表明,原位生成二氧化钛制备的新型TFN膜具有更出色的分离性能。当TBOT添加量为250 mg/L时,纯水通量达到78.0 L/(m^2·h),对Na_2SO_4、MgCl_2、MgSO_4和NaCl的截留率分别为99%、87%、97%和58%。这得益于在界面聚合的同时原位生成的纳米颗粒在膜中出色的分散性,有效的抑制了团聚的发生,提高了纳米复合膜的分离性能。Tetrabutyl titanate （TBOT） was used as the Ti source and dissolved with trimesoyl chloride （TMC） in oil phase, and then occurred interfacial polymerization reaction with piperazine （PIP） in aqueous phase to generate TiO2, and the polypiperazine amide/TiO2 composite nanofiltration membrane was prepared. The properties and surface structure of composite nanofiltration membrane were tested and characterized, and compared with the composite membranes fabricated by directly adding TiO2 NPs into organic phase and aqueous phase. The results showed that, the new composite membrane exhibited better separation performance. When the TBOT dosage was 250 mg/L, water flux increased to 78.0 L/（m^2·h）, while the rejections ofNa2SO4, MgCl2, MgSO4 and NaCl reached to 99%, 87%, 97% and 58%, respectively. These results demonstrated that in-situ generation ofnanoparticles had excellent dispersibility, effectively suppressed the nano-agglomeration and improved the separation performance of composite nanofiltration membrane.

关 键 词：界面聚合 纳米复合膜 二氧化钛 纳滤 原位生成 

分 类 号：X703.1[环境科学与工程—环境工程]