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• W2007243318 abstract "We reported previously that the regenerated dye-sensitized photocatalytic oxidation (SPCO) of As (III) over nanostructured TiO2 films under visible light could be highly accelerated by I− in aqueous solutions using a model ruthenium dye as sensitizer. Yet the mechanism remains to be determined. In this Article, the impact of I− upon the oxidation of As (III) via the photo-oxidative (by dye cation, S+) and photo-reductive pathways (by electron-initiated reactive oxygen species, EIROS) was quantified and the mechanism of the enhanced oxidation was evaluated by a combination of (photo) electrochemical measurements. The results under an anodic potential bias and without O2 indicate that I− could facilitate the regeneration of S+ through one-electron reaction to produce I2•- which could efficiently oxidize As (III) with ∼100% of columbic efficiency along with S+, thereby highly accelerating the oxidation of As (III) via S+. The regeneration of S+ was first-order reaction in surface-sorbed iodide. Under normal open-circuit conditions, although I−promoted the reduction of O2, it decreased both the oxidation rate of As (III) by EIROS and the columbic efficiency of EIROS, because EIROS could also react with I− to produce less efficient oxidants such as I2•- for the conversion of As (III) to As (V). Such negative effect of I− on the EIROS-induced oxidation of As (III) partly offset its positive influence on the S+-induced oxidation. Hence the enhancement by I− at open-circuit conditions was mainly resulted from the enhanced photo-oxidative pathway." @default.
• W2007243318 created "2016-06-24" @default.
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• W2007243318 creator A5087453686 @default.
• W2007243318 date "2013-08-01" @default.
• W2007243318 modified "2023-10-18" @default.
• W2007243318 title "Quantitatively understanding the mechanism of highly enhanced regenerated dye sensitized photooxidation of arsenite over nanostructured TiO2 electrodes under visible light by I−" @default.
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• W2007243318 doi "https://doi.org/10.1016/j.jelechem.2013.05.025" @default.
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