Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO2 in the presence of hole scavengers

doi:10.1016/j.cjche.2017.05.019

Abstract

Abstract: The indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with titanium dioxide (TiO₂) was investigated with various hole scavengers such as methanol, ethanol, 2-propanol, formaldehyde, acetone, formic acid and acetic acid. Although the direct photocatalytic reduction of arsenate to arsenite with TiO₂ was impossible, an indirect reduction of As(V) was possible in the presence of sacrificial electron donors to form strongly reductive radicals. The addition of ethanol was very effective for indirect photocatalytic reduction of As(V) in aqueous solution with TiO₂ photocatalyst. The indirect photocatalytic reduction rate of As(V) may be related with both the reaction rate constants of reaction of hydroxyl radicals with hole scavenger and the reactivities for the radicals M· which are produced by the reaction of ·OH with hole scavenger.

Key words: Indirect photocatalytic reduction, Arsenate, Arsenite, Titanium dioxide, Hole scavenger

摘要： The indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with titanium dioxide (TiO₂) was investigated with various hole scavengers such as methanol, ethanol, 2-propanol, formaldehyde, acetone, formic acid and acetic acid. Although the direct photocatalytic reduction of arsenate to arsenite with TiO₂ was impossible, an indirect reduction of As(V) was possible in the presence of sacrificial electron donors to form strongly reductive radicals. The addition of ethanol was very effective for indirect photocatalytic reduction of As(V) in aqueous solution with TiO₂ photocatalyst. The indirect photocatalytic reduction rate of As(V) may be related with both the reaction rate constants of reaction of hydroxyl radicals with hole scavenger and the reactivities for the radicals M· which are produced by the reaction of ·OH with hole scavenger.

关键词: Indirect photocatalytic reduction, Arsenate, Arsenite, Titanium dioxide, Hole scavenger

Abdus Samad, Shamim Ahsan, Ikki Tateishi, Mai Furukawa, Hideyuki Katsumata, Tohru Suzuki, Satoshi Kaneco. Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO₂ in the presence of hole scavengers[J]. Chin.J.Chem.Eng., 2018, 26(3): 529-533.

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Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO₂ in the presence of hole scavengers

Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO₂ in the presence of hole scavengers

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