title: Cadmium sulphide quantum dots sensitized hierarchical bismuth oxybromide microsphere with highly efficient photocatalytic activity.
abstract: Cadmium sulphide (CdS) quantum dots (QDs) sensitized that hierarchical bismuth oxybromide (BiOBr) photocatalysts were synthesized via a facile solvothermal approach for the first time, which were characterized by XRD, XPS, SEM, TEM, PL, and UV-vis DRS spectra. The photocatalytic activities were evaluated by the decomposition of methyl orange (MO) under visible light irradiation with commercial TiO(2) Degussa P25 as reference. The results revealed that CdS-BiOBr photocatalysts had strong light absorption in the visible light region compared with pure BiOBr. All CdS-BiOBr photocatalysts possessed higher photocatalytic activity than pure BiOBr and Degussa P25 under the visible light irradiation. The highest activity was obtained by 2%CdS-BiOBr. The enhanced photocatalytic performances were attributed to the matched band potentials of CdS QDs and BiOBr, which resulted in the efficient separation of photogenerated electron-hole pairs. Based on the experimental results, a reasonable photocatalytic mechanism over CdS-BiOBr photocatalysts was proposed. And the photodegradation of MO are associated with ()O(2)(-) radicals and the photogenerated holes on the valance bands of CdS QDs and BiOBr.
authors.affiliation: School of Material Science and Engineering, China University of Mining and Technology, XuZhou 221116, China; Post-doctoral Mobile Station of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China. Electronic address: zhangshengliu@hotmail.com.
authors.forename: ZhangSheng
authors.initials: Z
authors.lastname: Liu
authors.affiliation: School of Information and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: BianTao
authors.initials: B
authors.lastname: Wu
authors.affiliation: School of Material Science and Engineering, China University of Mining and Technology, XuZhou 221116, China.
authors.forename: YaBo
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Post-doctoral Mobile Station of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: Post-doctoral Mobile Station of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China.
authors.forename: LianGuo
authors.initials: L
authors.lastname: Wang
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D019187:Cadmium Compounds / Q000737:chemistry*; D002384:Catalysis; D008027:Light; D008863:Microspheres; D010316:Particle Size; D055668:Photochemical Processes; D045663:Quantum Dots; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D019187:Cadmium Compounds; D013440:Sulfides; C034939:cadmium sulfide; C542279:bismuth oxybromide; D001729:Bismuth