TiO2-incorporated polyelectrolyte composite membrane with transformable hydrophilicity/hydrophobicity for nanofiltration separation  

作　　者：Yahua Lu Zhenping Qin Naixin Wang Hongxia Guo Quanfu An Yucang Liang 

机构地区：[1]Beijing Key Laboratory for Green Catalysis and Separation,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China [2]College of Materials Science and Engineering,Beijing University of Technology,Key Laboratory of Advanced Functional Materials,Ministry of Education,Beijing 100124,China [3]Institut für Anorganische Chemie,Eberhard Karls Universität Tübingen,Auf der Morgenstelle 18,Tübingen 72076,Germany

出　　处：《Chinese Journal of Chemical Engineering》2020年第10期2533-2541,共9页中国化学工程学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(21476005,21878003);the National Natural Science Fund for Innovative Research Groups(51621003)。

摘　　要：The wettability of the membrane surface has shown obvious influent on the separation performance of the membrane.In this work,a hydrophilic PDA-[PDDA/TiO2]+Cl-membrane was prepared by a one-step codeposition of poly(diallyldimethylammonium chloride)(PDDA)polyelectrolyte solution containing positively charged TiO2@PDDA nanoparticles with the assistance of dopamine(DA).Such positively charged membrane can be transformed into a hydrophobic membrane PDA-[PDDA/TiO2]+PFO-via the counterion exchange between Cl-and PFO-(perfluorooctanoate).The transformation between hydrophilicity and hydrophobicity is reversible.For both hydrophilic and hydrophobic membranes,the nanofiltration performances were respectively investigated by the aqueous solution and ethanol solution of dyes including methyl blue(MB),Congo red(CR)and Evans blue(EB),and as well metal salt aqueous solution.The consecutive running stability and anti-fouling performance of both hydrophilic and hydrophobic membranes were explored.The results revealed that both membranes showed high nanofiltration performances for retention of dyes in(non)aqueous solution.For the hydrophilic membrane,the rejection of salts in a sequence is MgSO4>Na2SO4>MgCl2>NaCl.Moreover,both of the hydrophilic and hydrophobic membranes showed high stability and antifouling property.

关 键 词：Counterion exchange Wettability REVERSIBILITY Dopamine TiO2-incorporated polyelectrolyte composite membrane (non)aqueous nanofiltration 

分 类 号：TQ051.893[化学工程]