Photocatalytic thin film composite forward osmosis membrane for mitigating organic fouling in active layer facing draw solution mode  

作　　者：Yang Hu Pin Zhao Hao Liu Xiawen Yi Weilong Song Xinhua Wang 

机构地区：[1]Jiangsu Key Laboratory of Anaerobic Biotechnology,School of Environmental and Civil Engineering,Jiangnan University,Wuxi 214122,China [2]Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Chinese Chemical Letters》2023年第6期230-235,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52100089 and 51978312);the Six Major Talent Peaks of Jiangsu Province(No.2018-JNHB-014);Youth Fund of Basic Research Program of Jiangnan University(No.JUSRP121058)。

摘　　要：As a high-flux operation mode of thin film composite-forward osmosis(TFC-FO)membrane,active layer facing draw solution(AL-DS)mode suffers from the severe membrane fouling tendency,which is not addressed well.Here,we introduced a photocatalyst(Anatase titanium dioxide,A-TiO_(2))onto the support layer of TFC-FO membrane via the bonding of polydopamine(PDA)and polytetrafluoroethylene(PTFE),and prepared two photocatalytic membranes,A-TiO_(2)/PDA@TFC and A-TiO_(2)/[e-mail] with the pristine TFC-FO membrane,both A-Ti O_(2)/PDA@TFC and A-TiO_(2)/PTFE@TFC had an improved water permeability(10.5 L m^(-2)h^(-1)and 9.5 L m^(-2)h^(-1),respectively)and reduced reverse Na Cl flux salt(0.8 g m^(-2)h^(-1)and 0.7 g m^(-2)h^(-1),respectively)in the AL-DS mode using 1 mol/L Na Cl as draw solution and pure water as feed solution.Moreover,in the 16 h fouling experiment using 200 ppm bovine serum albumin(BSA)solution as a representative pollutant,the flux decline rate of both photocatalytic membranes was dramatically alleviated from 39.7%and 21.7%in the darkness to 8.5%and 9.7%under UV irradiation,respectively,indicating a significant anti-fouling capacity of photocatalytic effect.In all,the presence of A-TiO_(2)endowed membrane with high permeability,high rejection efficiency and excellent anti-fouling capacity under UV spotlight.As bonding agent,PTFE provided the modified membrane with a high photocatalytic effect and high self-cleaning capacity,while PDA increased the membrane permeability and protected membrane against photocatalytic damage.This work provides a simple and feasible method to improve the anti-fouling capacity of TFC-FO membrane in AL-DS mode.

关 键 词：Forward osmosis PHOTOCATALYSIS Membrane orientation Membrane fouling Water permeation 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]