title: Synthesis of surface sulfated BiWO with enhanced photocatalytic performance.
abstract: Sulfated BiWO (SBiWO) was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO (BiWO). The characterization results verified that sulfate anion mainly anchored on the catalyst surface greatly extended the visible-light-responsive range without destroying the crystal lattice. Moreover, the SBiWO-based photoactivities were evaluated with the removal of Malachite Green (MG) under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps (MPEDL2) and under visible light (lamda > 420 nm). The results demonstrated that the kinetic constant was increased 2.25 times, varying from 0.1478 (BiWO) to 0.3328 min(-1) (SBiWO-1). Similar results were also obtained for the visible light-driven reaction. Furthermore, radical scavengers such as t-butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1. This indicated that the sulfating process increased the generation of reactive oxygen species, which was further verified by molecular probe with salicylic acid. Thus, more blue-shifting at lam = 618 nm was observed over SBiWO. On the basis of the above results, the photocatalytic mechanism over the sulfated catalyst was also discussed.
authors.affiliation: South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China. juyongming@scies.org
authors.forename: Yongming
authors.initials: Y
authors.lastname: Ju
authors.forename: Jianming
authors.initials: J
authors.lastname: Hong
authors.forename: Xiuyu
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhencheng
authors.initials: Z
authors.lastname: Xu
authors.forename: Dongyang
authors.initials: D
authors.lastname: Wei
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Sang
authors.forename: Xiaohang
authors.initials: X
authors.lastname: Fang
authors.forename: Jiande
authors.initials: J
authors.lastname: Fang
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Wang
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D002384:Catalysis; D004785:Environmental Pollutants / Q000737:chemistry* / Q000528:radiation effects; D010782:Photolysis; D012394:Rosaniline Dyes / Q000737:chemistry* / Q000528:radiation effects; D013463:Sulfuric Acid Esters / Q000138:chemical synthesis*; D014466:Ultraviolet Rays
chemical_list: D004785:Environmental Pollutants; D012394:Rosaniline Dyes; D013463:Sulfuric Acid Esters; C005095:malachite green; D001729:Bismuth