Synthesis and Photocatalytic Properties of N/Bi₂WO₆ Flower-like Crystallites Self-Assembled from Nanoflakes

Author： Huang Jing Tan Guo-Qiang Yang Wei Zhang Li-Li Ren Hui-Jun Xia Ao

ISSN： 1040-7278

Source： Journal of Cluster Science, Vol.24, Iss.4, 2013-12, pp. : 1139-1149

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Abstract

N/Bi₂WO₆ flower-like crystallites self-assembled from nanoflakes were synthesized by a microwave-hydrothermal method using Na₂WO₄·2H₂O, Bi(NO₃)₃·5H₂O and CO(NH₂)₂ as raw materials. The effects of N-doping contents on the crystallites structure, photoluminescence and photocatalytic properties were also studied. The results indicate that N-doping turns the flower-like crystallites into withered flower-like structure composed of flocculent cotton clusters, which results in the decrease of the specific surface area from 21.72 m²g⁻¹ to 12.07 m²g⁻¹. When N-doping contents are 0.25 and 0.50, the photoluminescence intensity of the crystallites is decreased inhibiting the recombination of photogenerated electron-hole of Bi₂WO₆ crystallites, which has a decisive effect on the photocatalytic properties of Bi₂WO₆ crystallites. Under visible light irradiation for 60 min, the degradation rate of rhodamine B can nearly reach 100 % while under UV-irradiation for 20 min with N-doping contents 0.25 and 0.50, the degradation rate of the crystallites to rhodamine B can be up to 80 %.