Decomposition of Aqueous Cyanide Ions by Photocatalytic, Ozone and/or Hydrogen Peroxide Oxidation Routes

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  • SANUKI Sumiko
    Department of Material Systems Engineering and Life Science, Faculty of Engineering, Toyama University
  • YAMAMOTO Takuya
    Department of Material Systems Engineering and Life Science, Faculty of Engineering, Toyama University
  • MOTTATE Masateru
    Department of Material Systems Engineering and Life Science, Faculty of Engineering, Toyama University

Bibliographic Information

Other Title
  • 光触媒，オゾンあるいは過酸化水素によるＣＮ｀－´イオン含有水溶液の分解
  • 光触媒,オゾンあるいは過酸化水素によるCN-イオン含有水溶液の分解
  • ヒカリ ショクバイ オゾン アルイワ カサンカスイソ ニ ヨル CN イオン ガンユウ スイヨウエキ ノ ブンカイ

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Abstract

Decomposition reactions of aqueous CN- ions by TiO2 photocatalyst, ozone and/or hydrogen peroxide were investigated. The principal findings obtained are as follows:<BR>1) The presence of dissolved oxygen was necessary to decompose aqueous CN- ions photocatalytically. CN- was oxidized to CNO- with TiO2 catalyst, and then to CO32- and NO3-. Oxidation reaction of CNO- to CO32- and NO3- was far slower compared to that of CN- to CNO-. Photocatalytic oxidation reaction of CNO- at pHs 7 and 10 proceeded distinctly faster compared to that at pH 12. <BR>2) Although ozone oxidation of CN- took the same paths as photocatalytic reactions, but it was faster than that of photocatalytic routes. Combined use of photocatalyst and ozone for the decomposition of CN- was more efficient.<BR>3) Decomposition product of CN- with hydrogen peroxide was found as CNO- and N2. Joint use of hydrogen peroxide and photocatalyst promoted reaction of CN- to N2.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 122 (10/11), 489-496, 2006

    The Mining and Materials Processing Institute of Japan

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