title: Facile fabrication of efficient AgBr-TiO2 nanoheterostructured photocatalyst for degrading pollutants and its photogenerated charge transfer mechanism.
abstract: A simple microemulsion-like chemical precipitation method has been successfully developed to construct effectively-contacted AgBr-TiO(2) composite. The key of this method is the dual roles of Br(-) in the synthetic process, as linkers between cetyltrimethyl ammonium cation surfactants and nanocrystalline anatase TiO(2) in the acidic condition, and as bromine sources to directly produce nanocrystalline AgBr on the surfaces of TiO(2) by chemical precipitation. It is well demonstrated that the as-constructed AgBr-TiO(2) nanoheterostructured composites display effective photogenerated charge transfer between AgBr and TiO(2), favorable to improve charge separation, by means of the surface photovoltage technique in different atmospheres at the aid of outer electric fields, especially for the transient surface photovoltage technique in air. And also, the Br(-) in crystal lattice of AgBr could effectively capture photogenerated holes under illumination. These factors are well responsible for the enhanced activity for photocatalytic degradation of liquid phase aqueous phenol solution and gas phase acetaldehyde under either UV-visible or visible irradiation, and the stability of AgBr in the photocatalytic processes.
authors.affiliation: Key Laboratory of Functional Inorganic Materials Chemistry (Heilongjiang University), Ministry of Education, School of Chemistry and Materials Science, Harbin 150080, PR China.
authors.forename: Wenxin
authors.initials: W
authors.lastname: Wang
authors.forename: Liqiang
authors.initials: L
authors.lastname: Jing
authors.forename: Yichun
authors.initials: Y
authors.lastname: Qu
authors.forename: Yunbo
authors.initials: Y
authors.lastname: Luan
authors.forename: Honggang
authors.initials: H
authors.lastname: Fu
authors.forename: Yuchen
authors.initials: Y
authors.lastname: Xiao
mesh_terms: D000079:Acetaldehyde; D001965:Bromides / Q000737:chemistry*; D002384:Catalysis; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D004785:Environmental Pollutants / Q000737:chemistry*; D007525:Isoelectric Focusing; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures; D010777:Photochemistry; D018030:Silver Compounds / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013501:Surface-Active Agents / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001965:Bromides; D002593:Cetrimonium Compounds; D004785:Environmental Pollutants; D018030:Silver Compounds; D013501:Surface-Active Agents; C009495:titanium dioxide; D014025:Titanium; D000079:Acetaldehyde; C047751:silver bromide; D000077286:Cetrimonium