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The Membrane Society of Korea (한국막학회)
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Monovalent Ion Selective Anion-Exchange Membranes for Reverse Electrodialysis Application

역전기투석 응용을 위한 1가 이온 선택성 음이온교환막

  • Ji-Hyeon Lee (Department of Green Chemical Engineering, Sangmyung University) ;
  • Moon-Sung Kang (Department of Green Chemical Engineering, Sangmyung University)
  • 이지현 (상명대학교 그린화학공학과) ;
  • 강문성 (상명대학교 그린화학공학과)
  • Received : 2023.12.09
  • Accepted : 2024.01.18
  • Published : 2024.02.29
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Abstract

Reverse electrodialysis (RED) is an electro-membrane process employing ion-exchange membranes (IEMs) that can harvest electric energy from the concentration difference between seawater and river water. Multivalent ions contained in seawater and river water bind strongly to the fixed charge groups of the IEM, causing high resistance and reducing open-circuit voltage and power density through uphill transport. In this study, a pore-filled anion-exchange membrane (PFAEM) with excellent monovalent ion selectivity and electrochemical properties was fabricated and characterized for RED application. The monovalent ion selectivity of the prepared membrane was 3.65, which was superior to a commercial membrane (ASE, Astom Corp.) with a selectivity of 1.27 under the same conditions. Additionally, the prepared membrane showed excellent electrochemical properties, including low electrical resistance compared to ASE. As a result of evaluating RED performance under seawater of 0.459 M NaCl/0.0510 M Na2SO4 and river water of 0.0153 M NaCl/0.0017 M Na2SO4, the maximum power density of 1.80 W/m2 was obtained by applying the prepared membrane, which is a 40.6% improved output performance compared to the ASE membrane.

역전기투석(reverse electrodialysis, RED)은 해수와 담수의 농도 차로부터 에너지를 얻는 이온교환막을 이용한 전기막 공정이다. 해수와 담수에 포함된 다가 이온은 이온교환막의 고정 전하 그룹에 강하게 결합하여 높은 저항을 유발하며 uphill transport를 통해 개방회로 전압과 전력 밀도를 저하시킬 수 있다. 본 연구에서는 RED 응용을 위해 1가 이온 선택성 및 전기화학적 특성이 우수한 세공충진 음이온교환막(pore-filled anion-exchange membrane, PFAEM)을 제조하였다. 제조된 막의 1가 이온 선택성은 3.65였으며 동일 조건에서 1.27의 선택성을 갖는 상용막(ASE, Astom Corp.)보다 우수한 수준을 나타내었다. 또한 제조된 막은 ASE 대비 낮은 전기적 저항 등 우수한 전기화학적 특성을 나타내었다. 0.459 M NaCl/0.0510 M Na2SO4의 해수와 0.0153 M NaCl/0.0017 M Na2SO4의 담수 조건에서 RED 성능을 평가한 결과 제조된 막을 적용하여 1.80 W/m2의 최대 전력 밀도를 얻었으며 이는 ASE 막 대비 40.6% 향상된 출력 성능이었다.

Keywords

Acknowledgement

본 연구는 2023년도 상명대학교 교내연구과제 지원을 받아 수행되었음(2023-A000-0185).

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