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Controlled Synthesis and Visible Light Catalytic Activity of Multi-Shaped γ-Bi_2MoO_6 Microcrystals

A series of γ-Bi2MoO6 microcrystals were synthesized by using surfactant assisted hydrothermal route. The change of phase and composition of as-prepared products by the impact of varied solution p H values and different surfactants were investigated. The visible light catalytic activities of the γ-Bi2MoO6 powders were evaluated by means of the catalytic degradation of Rhodamine B aqueous solution. The degradation effects under different reaction conditions were determined in detail. The results show that when the reactant mole ratio of Bi to Mo is set at 2∶ 1 and the p H value of reaction solution is kept in the range from 3 to 9,the resulting products is pure orthorhombic γ-Bi2MoO6 whether the surfactants are added or not. When the p H value is 9,the as-obtained γ-Bi2MoO6 samples exhibit higher catalytic activity,and the degradation rate can reachs 79. 62% within 3 h visible-light irradiation. The sample obtained with assistance of SDS shows best photocatalytic activity and the degradation rate is 98. 81%.