Hydrothermal synthesis of Bi_2WO_6 with a new tungsten source and enhanced photocatalytic activity of Bi_2WO_6 hybridized with C_3N_4

Bi_2WO_6 nanosheets were synthesized by a hydrothermal method with H_2WO_4 for the first time. The band structure of Bi_2WO_6 was investigated on the basis of density functional theory calculations. Bi_2WO_6 photocatalysts showed photocatalytic activity for the degradation of methylene blue under visible light irradiation. Kinetic studies using radical scavenger technologies suggested that holes were the dominant photo-oxidants. After hybridization with C_3N_4, the photocatalytic activity of Bi_2WO_6 was obviously enhanced. The enhanced photocatalytic activity of the C_3N_4/Bi_2WO_6 photocatalysts could be attributed to the effective separation of photogenerated e^-/h+ pairs. The photogenerated holes on the valence band of Bi_2WO_6 can transfer to the highest occupied molecular orbital of C_3N_4 via the well-developed interface, causing a reduction in the probability of e^−/h^+ recombination; consequently, large numbers of photogenerated holes led to the enhancement of the photocatalytic activity.

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