Oxidation Decomposition of Cyanide Ion Using TiO2 and N-doped TiO2 Photocatalysts

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  • Sumiko SANUKI
    Department of Material Systems Engineering and Life Science, Faculty of Engineering, Toyama University
  • KATADA Yumi
    Department of Material Systems Engineering and Life Science, Faculty of Engineering, Toyama University
  • MOTTATE Masateru
    Graduate School of Science and Engineering, Toyama University

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Other Title
  • ＴｉＯ２光触媒および窒素ドープＴｉＯ２光触媒を用いたＣＮ｀－´イオンの酸化分解
  • TiO2光触媒および窒素ドープTiO2光触媒を用いたCN[-]イオンの酸化分解
  • TiO2 ヒカリ ショクバイ オヨビ チッソ ドープ TiO2 ヒカリ ショクバイ オ モチイタ CN イオン ノ サンカ ブンカイ

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Abstract

Oxidation decomposition reaction of CN- ion was studied using two types of TiO2 photocatalysts and related nitrogen-doped photocatalysts. Although the oxidation products of CN- ion using TiO2 powder consisting 30% rutile and 70% anatase demonstrated CNO-, followed by NO3- and CO32-, the generation of CNO- was inhibited and the formation of molecular nitorogen was detected with TiO2 composed of 100% anatase. Doping nitrogen to TiO2 photocatalysts facilitates their use under visible light irradiation. Particularly, nitrogen-doped anatase type TiO2 photocatalyst oxidized CN- ion to N2 directly, while CNO- formation was greatly suppressed under the irradiation by sunlight. The use of nitrogen-doped anatase type TiO2 photocatalyst under sunlight irradiation is useful as a novel decomposition method for spent CN- solution. Redox potential determination is effective to monitor CN- ion decomposition reaction.

Journal

  • Journal of MMIJ

    Journal of MMIJ 124 (3), 190-195, 2008

    The Mining and Materials Processing Institute of Japan

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