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• W2783296470 abstract "Bismuth tungstate (BiW) is a promising visible light photocatalyst. Herein we report a synergism between Pt and phosphate that increases the UV and visible light activities of BiW by factors of 32 and 15, respectively, for phenol degradation in neutral aqueous solution. BiW was home-made, followed by a photochemical deposition of Pt (Pt/BiW). On the addition of phosphate, the reaction rates on BiW and Pt/BiW in aqueous solution were decreased and increased, respectively. Such a phosphate effect was also observed from the reduction of O2 to H2O2, and from 2,4-dichlorophenol degradation. Moreover, the rate of phenol degradation was proportional to the amount of phosphate adsorption on Pt/BiW, and the phosphate activity increased in the order H3PO4 < H2PO4− < HPO42−. A (photo)electrochemical measurement revealed that Pt and phosphate catalyzed the electron reduction of O2 and the hole oxidation of phenol, respectively. A possible mechanism is proposed, involving the hole oxidation of phosphate into a phosphate radical, followed by phenol oxidation in aqueous phase. As phosphate loading exceeded 0.50 mM, however, the rates of phenol degradation on Pt/BiW under UV and visible light decreased with the phosphate loading. This is ascribed to recombination of the phosphate radicals into a less reactive peroxobiphosphate." @default.
• W2783296470 created "2018-01-26" @default.
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• W2783296470 date "2018-05-01" @default.
• W2783296470 modified "2023-09-29" @default.
• W2783296470 title "Improved photocatalytic degradation of chlorophenol over Pt/Bi2WO6 on addition of phosphate" @default.
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• W2783296470 doi "https://doi.org/10.1016/j.apsusc.2017.12.247" @default.
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