Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Improved Copper Ion Recovery Efficiency through Surface Modification of Membranes in the Electrodialysis/Solvent Extraction Process

전기투석/용매추출 공정에서 멤브레인 표면 개질을 통한 구리 이온의 회수 효율 향상

  • Joongwon, Park (Department of Chemical Engineering, Kwangwoon University) ;
  • Rina, Kim (Resources Utilization Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Hyunju, Lee (Resources Utilization Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Min-seuk, Kim (Resources Utilization Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Hiesang, Sohn (Department of Chemical Engineering, Kwangwoon University)
  • 박중원 (광운대학교 화학공학과) ;
  • 김리나 (한국지질자원연구원 자원활용연구본부) ;
  • 이현주 (한국지질자원연구원 자원활용연구본부) ;
  • 김민석 (한국지질자원연구원 자원활용연구본부) ;
  • 손희상 (광운대학교 화학공학과)
  • Received : 2022.11.24
  • Accepted : 2022.12.09
  • Published : 2022.12.31
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Abstract

This study presents the improved recovery efficiency of rare metal ions through the modified separation membrane wettability and hydrogen ion permeation in the anion exchange membrane (AEM) under the recovery process of combined electrodialysis and solvent extraction. Specifically, the wettability of the separator was enhanced by hydrophilic modification on one separator surface through polydopamine (PDA) and lipophilic modification on the other surface through SiO2 or graphene oxide (GO). In addition, the modified surface of AEM with polyethyleneimine (PEI), PDA, poly(vinylidene fluoride) (PVDF), etc. reduces the water uptake and modify the pore structure for proton ions generation. The suppressed transport resulted in the reduced hydrogen ion permeation. In the characterization, the surface morphology, chemical properties and composition of membrane or AEM were analyzed with Scanning Electron Microscopy (SEM) and Fourier Transform-Infrared Spectroscopy (FT-IR). Based on the analyses, improved extraction and stripping and hydrogen ion transport inhibition were demonstrated for the copper ion recovery system.

본 연구는 전기투석과 용매추출을 융합한 희유금속 회수 공정에서 분리막과 음이온교환막의 개질을 통해 유기상과 수상에 대한 분리막의 낮은 젖음성 및 AEM을 통한 수소이온 투과로 인한 금속이온의 회수 효율 감소를 개선하였다. 구체적으로, 분리막 표면 중 한면은 polydopamine (PDA) 통한 친수성 개질, 다른 면은 SiO2 또는 graphene oxide를 통한 친유성개질을 함으로써 분리막의 젖음성을 개선하였다. 또한, 음이온교환막의 표면을 polyethyleneimine, PDA, poly(vinylidene fluoride) 등을 이용, 개질해 수분 흡수(Water uptake) 감소 및 기공구조 변화를 통해 수소이온 수송을 억제해 수소이온 투과를 억제할 수 있다. 개질된 막 표면 형상과 화학적 특성 및 조성은 주사전자현미경과 푸리에변환 적외선 분광법을 통해 확인되었고, 이를 구리 이온 회수 시스템에 적용해 향상된 추출 및 탈거 효율과 수소이온 수송 억제능을 확인하였다.

Keywords

Acknowledgement

이 논문은 2021년도 광운대학교 우수연구자 지원 사업에 의해 연구되었습니다. 또한, 본 연구는 2022년도 정부의 재원으로 한국연구재단 기초연구사업 및 한국 연구재단-나노·소재기술개발사업의 지원을 받아 수행된 연구 (No. NRF-2020R1F1A1065536, 2009-0082580) 이며, 한국지질자원연구원 주요사업인 '전기투석을 이용한 Zero-emission 유가금속 분리정제기술 탐색 연구 (21-3212-2)' 과제의 연구비 지원으로 수행되었습니다.

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