文献类型：期刊文献

英文题名：Ag NPs coated PVDF@TiO2 nanofiber membrane prepared by epitaxial growth on TiO2 inter-layer for 4-NP reduction application

作者：Wang, Yi-Xing[1];Ma, Shuai[1];Huang, Meng-Nan[1];Yang, Hu[1];Xu, Zhen-Liang[1];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, Membrane Sci & Engn R&D Lab, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2019

卷号：227

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20192507071374);WOS:【SCI-EXPANDED(收录号:WOS:000480375100031)】；

基金：The authors gratefully acknowledge National Natural Science Foundation of China (NO. 21276075) for the financial support.

语种：英文

外文关键词：Catalytic membrane; Epitaxial growth; 4-nitrophenol reduction; Process mechanism

摘要：The catalytic membrane plays an increasingly important role in the environmental remedy. In the present study, a novel catalytic membrane was prepared by growing Ag NPs on the porous PVDF@TiO2 nanofiber (NF) based on the epitaxial growth principle. Using the implanted TiO2 NPs as inter-layer, Ag NPs can be tightly coated to the surface of the porous PVDF@TiO2 NF. The obtained NF membrane can withstand the ultrasonic washing treatment of 4 hrs. Afterward, the reduction of 4-nitrophenol (4-NP) through the filtration using Ag coated NF membrane was investigated. The flux of Ag coated NF membrane reaches 580 Lm(-2) h(-1) bar(-1), and the reduction degree is above 96%. The catalytic activity of the Ag coated PVDF NF membrane remains stable during 7 repeated operation recycles, with each one lasting for at least 2 h. Meanwhile, the calculated apparent reaction rate constant is much higher than that reported in the single reaction process. To explore the reason, a new mechanism based on the adsorption-reaction path is proposed to explain their synergistic effect.