Enhanced Photocatalytic Activity of ZnWO4 Catalyst via Fluorine Doping
journal contributionposted on 16.08.2007, 00:00 by Guangli Huang, Yongfa Zhu
Fluorine interstitially doped ZnWO4 (F−ZnWO4) was synthesized by fluorine-ion addition in a hydrothermal process. The effects of fluorine doping on crystal structure, optical properties, and photocatalytic activity of ZnWO4 catalyst were investigated. The results showed that the doped fluorine ions could increase the coordination sphere around the W atom in a WO6 octahedron and cause the distortion of the WO6 octahedron in a ZnWO4 crystal. Moreover, the strength of absorption in the UV region and transfer rate of photogenerated electrons to the surface increased after doping with fluorine. With an increase of fluorine doping concentration, the photoactivities of samples were enhanced greatly. The photocatalytic activity can be enhanced 2.6 times for the degradation of RhB when the optimal atomic ratio of F/Zn was 0.4. The enhanced photocatalytic activity originated from the increase of transfer rate of photogenerated electrons to the photocatalyst surface.