title: Preparation and Photocatalytic of Nanoneedle Bi/ZnWO₄by Two-Step Hydrothermal Method.
abstract: Nanoneedle Bi/ZnWO₄ photocatalysts were successfully synthesized using a two-step hydrothermal method. In the first hydrothermal experiment ZnO/ZnWO₄ nanoneedle crystals were synthesized from NaWO₄· 2H₂O and Zn(NO₃)₂· 6H₂O, using polyacrylamide (PAM) as a template in a hydrothermal environment. Bi cations were then reduced by t-BuONa in a second hydrothermal experiment, adding nanoneedle ZnO/ZnWO₄. The catalysts were then characterized by powder X-ray diffraction (XRD), scanning electron microcopy (SEM), energy dispersive spectrometer (EDS) and UV-vis diffuse reflectance spectrum (DRS). The results show that by adding Bi nanoparticles, the composition of the mixture gradually changed from that of ZnO/ZnWO₄ to Bi/ZnWO₄. The nanoneedle Bi/ZnWO₄samples displayed better UV light photocatalysis than the nanoneedle ZnO/ZnWO₄ samples. The optimum concentration of Bi was investigated using a photocatalytic experiment. A "blue shift" was observed when the molar ratio of Bi was increased.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Chen
authors.forename: Lingmei
authors.initials: L
authors.lastname: Guo
authors.forename: Dandan
authors.initials: D
authors.lastname: Zhang
authors.forename: Jingxin
authors.initials: J
authors.lastname: Li
authors.forename: Shipin
authors.initials: S
authors.lastname: Liu
authors.forename: Bin
authors.initials: B
authors.lastname: Li