The effects of halide ions on the radiation-induced decoloration of azo and anthraquinone dyes in N2O-saturated aqueous solutions.

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概要

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• The radiation-induced decoloration of azo and anthraquinone dyes was studied in N<SUB>2</SUB>O-saturated aqueous solutions containing halide ions. In the N<SUB>2</SUB>O-saturated solutions, the decoloration yield, <I>G</I>(–Dye), increased markedly upon the addition of Br<SUP>−</SUP> and I<SUP>−</SUP>, which are efficient scavengers of the OH radical. In the nitrogensaturated solutions, however, the <I>G</I>(–Dye) decreased upon the addition of Br<SUP>−</SUP> and I<SUP>−</SUP>. Such an increase in the <I>G</I>(–Dye) upon the addition of Br<SUP>−</SUP> and I<SUP>−</SUP> in the N<SUB>2</SUB>O-saturated solutions is mainly attributable to the attacks of the halide radical anions, Br<SUB>2</SUB><SUP>−</SUP> and I<SUB>2</SUB><SUP>−</SUP>, on the ring structure of the dyes. On the other hand, the <I>G</I>(–Dye) was not changed upon the addition of Cl<SUP>−</SUP> in the N<SUB>2</SUB>O-saturated solution. This may be attributable to the very slow rate of the formation of Cl<SUB>2</SUB><SUP>−</SUP> in a neutral solution.

• 公益社団法人 日本化学会の論文

著者

• Suzuki Nobutake

  Japan Atomic Energy Research Institute

• Washino Masamitsu

  Japan Atomic Energy Research Institute

• Suzuki Nobutake

  Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment

• Tokunaga Okihiro

  Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment

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