Photodecomposition of Hexacyanoferrate(III)ion and Addition Effects of Some Metal-oxide Semiconductors in Alkaline Solutoin

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Other Title
  • 塩基性溶液中におけるヘキサシアノ鉄(III)酸イオンの光分解反応と酸化物半導体の添加効果
  • Photodecomposition of hexacyanoferrate(III)ion and addition effects of some metal-oxide semiconductors in alkaline solution.

Description

The photochemical decomposition behaviour of hexacyanoferrateOlnion ([Fe(CN)6]3-) in alkaline solution was studied using an ultraviolet light source (low pressure mercuty lamp)in nitrogen atmosphere by means of UV spectra and chemical analyses. The overall photochemical reaction of [Fe(CN)6]3- was foun d to cause some complicated processes depending on the concentration of hydroxide ion (OH-). In 0.1 mol.dm-3 NaOH solution, [Fe(CN)6]3- was first co nverted to aquapentacyanoferrate (II) ion ([Fe(CN)5.H2O]3-) and cyanide ion (CN-) under the irradiati on. Under further irradiation, iron(II) ion (Fe(II)) produced in the photo-induced decomposition of [Fe(CN)5H2O]3- gave rise to the precipitate of Fe(III) hydroxide and free cyanide ion was oxidized to cyanate ion (OCN-). OCN- and Fe(III) hydroxide may be formed by the reaction of CN- and Fe(II) with the oxygen generated in the following photo-reaction of OH-.2 OH- --1/2O2 + H2O + 2 eIt is assumed that the electron (e-) is used to reduce the Fe(III) of [Fe(CN)6]3- to the Fe(II) of [Fe(CN)5. H2O]3-. Furthermo re, effects of several semiconductor powders on the decomposition reaction of [Fe(CN)6]3- were also examined.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1990 (6), 682-687, 1990-06-10

    The Chemical Society of Japan

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