Abstract
Abstract Cu 2 O loaded nano-BiVO 4 (Cu 2 O/BiVO 4 ) photocatalysts with various weight percents of Cu 2 O were successfully prepared by a facile and effective ultrasonic dispersion method at room temperature. Methylene blue (MB), methyl orange (MO) and phenol in an aqueous solution served as a probe reaction to evaluate the photocatalytic activities of the as-prepared Cu 2 O/BiVO 4 catalysts under the irradiation of visible light. The photocatalytic activity of the Cu 2 O/BiVO 4 catalysts was greatly enhanced, compared with that over commercial Degussa P-25 (TiO 2 ), pure Cu 2 O and BiVO 4 . The remarkably enhanced photocatalytic activities could be mainly attributed to the effective transfer of the photogenerated electrons and holes at the interface of BiVO 4 and Cu 2 O, which reduced the recombination of electron–hole pairs. A transfer process of photogenerated carriers was proposed based on the band structures of BiVO 4 and Cu 2 O. The photocatalytic mechanism of Cu 2 O/BiVO 4 catalysts was discussed.
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