title: Facile surface modification of anion-exchange membranes for improvement of diffusion dialysis performance.
abstract: In this study, a facile membrane modification method by spin-coating of pyrrole (Py) monomers dissolved in a volatile solvent followed by an interfacial polymerization is proposed. The surface of a commercial anion-exchange membrane (i.e., Neosepta-AFX, Astom Corp., Japan) was successfully modified with polypyrrole (Ppy) to improve the acid recovery performance in diffusion dialysis (DD). The result of DD experiments revealed that both the acid and metal ion transports are significantly influenced by the surface modification. The metal crossover through the membranes was largely reduced while mostly maintaining the acid permeability by introducing a thin Ppy layer with excellent repelling property to cations on the membrane surface. As a result, the anion-exchange membrane modified with the optimum content of Py monomer (5 vol.%) exhibited excellent acid dialysis coefficient (KAcid) and selectivity (KAcid/KMetal) which is approximately twice as high as that of the pristine membrane.
authors.affiliation: Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan 330-720, Republic of Korea.
authors.forename: Do-Hyeong
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan 330-720, Republic of Korea.
authors.forename: Han-Sol
authors.initials: HS
authors.lastname: Park
authors.affiliation: Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan 330-720, Republic of Korea.
authors.forename: Seok-Jun
authors.initials: SJ
authors.lastname: Seo
authors.affiliation: Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan 330-720, Republic of Korea.
authors.forename: Jin-Soo
authors.initials: JS
authors.lastname: Park
authors.affiliation: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea. Electronic address: shmoon@gist.ac.kr.
authors.forename: Seung-Hyeon
authors.initials: SH
authors.lastname: Moon
authors.affiliation: Fuel Cell Research Center, Korea Institute of Energy Research, Yuesong-gu, Daejeon 305-343, Republic of Korea.
authors.forename: Young-Woo
authors.initials: YW
authors.lastname: Choi
authors.affiliation: ENERTEC Co. Ltd., 138 Gongdanbukgil, Chilseo-myeon, Haman-gun, Gyeongsangnam-do 637-941, Republic of Korea.
authors.forename: Young Su
authors.initials: YS
authors.lastname: Jiong
authors.affiliation: ENERTEC Co. Ltd., 138 Gongdanbukgil, Chilseo-myeon, Haman-gun, Gyeongsangnam-do 637-941, Republic of Korea.
authors.forename: Dong Hee
authors.initials: DH
authors.lastname: Kim
authors.affiliation: Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan 330-720, Republic of Korea. Electronic address: solar@smu.ac.kr.
authors.forename: Moon-Sung
authors.initials: MS
authors.lastname: Kang
mesh_terms: D000837:Anion Exchange Resins / Q000737:chemistry*; D000838:Anions; D002712:Chlorides / Q000737:chemistry*; D003956:Dialysis; D004058:Diffusion; D005290:Ferric Compounds / Q000737:chemistry*; D007474:Ion Exchange; D008567:Membranes, Artificial; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000837:Anion Exchange Resins; D000838:Anions; D002712:Chlorides; D005290:Ferric Compounds; D008567:Membranes, Artificial; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; C024555:ferric chloride
keywords: Anion-exchange membranes; Diffusion dialysis; Interfacial polymerization; Polypyrrole; Surface modification