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Received May 9, 2008
Accepted September 5, 2008
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전기화학적 반응을 이용한 질산성 질소의 암모니아성 질소로 전환
Transformation of Nitrogen in the Form of Nitrate into Ammonia by Electrochemical Reaction
인하대학교 화학공학과, 402-751 인천시 남구 용현동 253
Department of Chemical Engineering, Inha University, Incheon 402-751, Korea
Korean Chemical Engineering Research, October 2008, 46(5), 1013-1016(4), NONE Epub 10 November 2008
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Abstract
본 연구에서는 폐수 내 존재하는 질산성 질소를 제거하기 위해 캐소드물질로 철(Fe), 구리(Cu), 니켈(Ni), 아연(Zn)을 선택하여 전기화학적 환원반응 특성을 조사하였다. NO3-로부터 NH3로의 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.
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 NO3- 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 NH3. Nitrogen in the form of ammonia was completely removed by the reaction with HOCl.
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Dima GE, Beltramo GL, Koper MTM, Electrochim. Acta, 50(21), 4318 (2005)
Christophe J, Tsakova V, Buess-Herman C, Z. Phys. Chem., 221, 1123 (2007)
Bouzek K, Paidar M, Sadilkova A, Bergmann H, J. Appl. Electrochem., 31(11), 1185 (2001)
Levy-Clement C, Ndao NA, Katty A, Bernard M, Deneuville A, Comninellis C, Fujishima A, Diam. Relat. Mater., 12, 606 (2003)
Peel JW, Reddy KJ, Sullivan BP, Bowen JM, Water Res., 37, 2512 (2003)
Sim JH, Seo HJ, Kim DH, Korean Chem. Eng. Res., 45(2), 190 (2007)
Gain E, Laborie S, Viers P, Rakib M, Durand G, Hartmann D, J. Appl. Electrochem., 32(9), 969 (2002)
Sheela G, Pushpavanam M, Pushpavanam S, Int. J. Hydrogen Energy, 27, 627 (2002)
Fanning JC, Coord. Chem. Rev., 199, 159 (2000)
Smith AJ, Tran T, Wainwright MS, J. Appl. Electrochem., 30(10), 1103 (2000)
Tak Y, Kang J, Seo M, Lee J, “Development of Electrochemical Treatment of Wastewater Containing Nitrogen,” Ministry of Environment(2006)
