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

N/Bi2WO6 flower-like crystallites self-assembled from nanoflakes were synthesized by a microwave-hydrothermal method using Na2WO4 center dot 2H(2)O, Bi(NO3)(3)center dot 5H(2)O 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 m(2)g(-1) to 12.07 m(2)g(-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 %.