title: Fabrication of ZnS-Bi-TiO2 composites and investigation of their sunlight photocatalytic performance.
abstract: The ZnS-Bi-TiO2 composites were prepared by the sol-gel method and were characterized by X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), X-ray diffraction (XRD) and UV-visible diffuse reflectance spectroscopy (UV-Vis DRS). It is found that the doped Bi as Bi(4+)/Bi(3+) species existed in composites, and the introducing of ZnS enhanced further the light absorption ability of TiO2 in visible region and reduced the recombination of photogenerated electrons and holes. As compared to pure TiO2, the ZnS-Bi-TiO2 exhibited enhanced photodegradation efficiency under xenon lamp irradiation, and the kinetic constant of methyl orange removal with ZnS-Bi-Ti-0.005 (0.0141 min(-1)) was 3.9 times greater than that of pure TiO2 (0.0029 min(-1)), which could be attributed to the existence of Bi(4+)/Bi(3+) species, the ZnS/TiO2 heterostructure.
authors.affiliation: School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China.
authors.forename: Xuewei
authors.initials: X
authors.lastname: Dong
authors.affiliation: School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.affiliation: School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
authors.forename: Chuan
authors.initials: C
authors.lastname: Rong
authors.affiliation: School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China.
authors.forename: Hongchao
authors.initials: H
authors.lastname: Ma
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D056951:Photoelectron Spectroscopy; D010782:Photolysis; D013056:Spectrophotometry, Ultraviolet; D013440:Sulfides / Q000737:chemistry*; D013472:Sunlight; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004785:Environmental Pollutants; D013440:Sulfides; D017967:Zinc Compounds; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium; C031238:zinc sulfide; D001729:Bismuth