Photoreduction of Methylene Blue by the Visible Light in the Aqueous Solution Containing Certain Kinds of Inorganic Salts. III. Kinetic Treatment of the Reaction

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概要

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• Kinetic treatment was undertaken for the photobleaching of the aqueous solution of methylene blue containing various inorganic salts.<BR>If a certain kind of inhibiting action due to some reaction product(s) is taken into consideration, the rate for borate buffer is satisfactorily reproduced as the first order of excited dye, while for phosphate buffer it is second order with regard to dye. It was further found from this analysis that the rate of the essential step (or steps) of the reaction for the case of borate is approximately proportional to the concentration of OH<SUP>－</SUP>, while for the case of phosphate it is almost independent of pH.<BR>The quantity of irreversible decomposition of dye in case of borate buffer was estimated to be very small against that of the reversible bleaching, the former being a few tenths of the latter from the experimental results obtained when ferric chloride and <I>o</I>-phenanthroline were added to the borate buffer solution.<BR>Judging from the results hitherto obtained,it is most plausible that the photoreduction of methylene blue in case of borate takes place through the decomposition of water. But in case of phosphate, there still remains some possibility that the reaction commences by the interaction of excited dye and ground state dye, electron transfer taking place between them.<BR>The quantum yield of the bleaching reaction was measured and found to be (2∼3)×10<SUP>－4</SUP> for borate buffer and (7∼9)×10<SUP>－4</SUP> for phosphate buffer.

• 社団法人 日本化学会の論文

著者

• USUI Y.

  Department of Orthodontics, Matsumoto Dental University School of Dentistry

• Koizumi Masao

  Department of Chemistry Faculty of Science Tohoku University

• Usui Yoshiharu

  Department of Chemistry Faculty of Science Tohoku University

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