Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation and Application of Anion-Exchange Membrane having Low Water-Splitting Capability

저 물분해 특성을 가진 음이온 교환막의 제조 및 응용

  • Moon-Sung Kang (Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology (K-JIST)) ;
  • Yong-Jin Choi (Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology (K-JIST)) ;
  • Seung-Hyeon Moon (Department of Environmental Science and Engineering, Kwangju Institute of Science and Technology (K-JIST))
  • Published : 2003.03.01
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Abstract

The Preparation and electrochemical characterization of anion-exchange membranes containing pyridinium groups were performed. As a result, the pyridinium membranes showed good electrochemical properties, comparable to those of the commercial membranes, with electrical resistance of less than $3.0 {\Xi}cm^2$ in a 0.5 mol $dm^{-3}$ NaCl and high ionic permselectivity (the transport number of $Cl^-$ ions being 0.97). Moreover, water splitting in the membranes containing pyridinium group was about two or three order of magnitude lower than those in the commercial membranes (ｅ.ｇ. AM-1, Tokuyama Crop., Japan) at the same current density because the resonance effedt in the quaternary aromatic pyridinium group contributed to their molecular stability. In addition, the electrodialytic properties of the pyridinium membranes were evaluated in a semi-pilot scale.

피리디니움 (pyridunium) 그룹을 포함한 음이온교환막의 제조 및 전기화학적 특성 평가를 수행하였다. 실험 결과, 제조된 피리디니움 음이온교환막은 상용막과 대등한 전기저항 ($3.0 {\Xi}cm^2$>, in 0.5 mol $dm^{-3}$ NaCl) 및 높은 이온선택도 ($Cl^-$ 이온수송수 약 0.97)의 우수한 전기화학적 특성을 나타내었다. 또한 피리니디움 그룹을 함유한 음이온교환막에서의 물분해는 상용막 (AM-1, Tokuyama Corp., Japan)에 비해 동일한 전류밀도 하에서 약 100배 내지 1000배 가량 낮게 측정되었는데 이는 4차 아로마틱 피리디니움 그룹의 공명효과 (resonance effect)가 이온교환기의 분자구조적 안정성에 영향을 미쳤기 때문으로 사료되었다. 또한 피리디니움 음이온교환막의 전기투석 특성이 semi-pilot 스케일에서 평가되었다.

Keywords

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