Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Transformation of Nitrogen in the Form of Nitrate into Ammonia by Electrochemical Reaction

전기화학적 반응을 이용한 질산성 질소의 암모니아성 질소로 전환

  • Lee, Jae Kwang (Department of Chemical Engineering, Inha University) ;
  • Kim, Doyeon (Department of Chemical Engineering, Inha University) ;
  • Tak, Yongsug (Department of Chemical Engineering, Inha University)
  • Received : 2008.05.09
  • Accepted : 2008.09.05
  • Published : 2008.10.31
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Abstract

Nitrogen in the form of nitrate was electrochemically reduced with different cathode materials including Fe, Ni, Cu, and Zn. Zn cathode shows the greatest electrocatalytic activity on the transformation of nitrate ions into ammonia and the $NO_3^-$ removal efficiency has highest value at pH 8.5. Nitrogen in the form of nitrate was initially reduced into nitrite and sequentially, converted into nitrogen inside $NH_3$. Nitrogen in the form of ammonia was completely removed by the reaction with HOCl.

본 연구에서는 폐수 내 존재하는 질산성 질소를 제거하기 위해 캐소드물질로 철(Fe), 구리(Cu), 니켈(Ni), 아연(Zn)을 선택하여 전기화학적 환원반응 특성을 조사하였다. $NO_3^-$로부터 $NH_3$로의 변환반응에 있어서 Zn이 가장 우수한 촉매 특성을 가지고있으며, pH 8.5에서 가장 높은 질산성 질소 제거 효율을 나타내었다. 전극표면에서 질산성 질소는 아질산성 질소로 환원된 후, 암모니아성 질소로 전환되는 것을 확인하였으며 암모니아성 질소는 HOCl과의 화학반응을 통하여 질소 형태로 완전히 제거할 수 있었다.

Keywords

Acknowledgement

Supported by : 한국환경기술진흥원

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