title: Synthesis and characterization of Ag₃PO₄ immobilized with graphene oxide (GO) for enhanced photocatalytic activity and stability over 2,4-dichlorophenol under visible light irradiation.
abstract: A series of visible-light responsive photocatalysts prepared using Ag3PO4 immobilized with graphene oxide (GO) with varying GO content were obtained by an electrostatically driven method, and 2,4-dichlorophenol (2,4-DCP) was used to evaluate the performance of the photocatalysts. The composites exhibited superior photocatalytic activity and stability compared with pure Ag3PO4. When the content of GO was 5%, the degradation efficiency of 2,4-DCP could reach 98.95%, and 55.91% of the total organic (TOC) content was removed within 60 min irradiation. Meanwhile, the efficiency of 91.77% was achieved for 2,4-DCP degradation even after four times of recycling in the photocatalysis/Ag3PO4-GO (5%) system. Reactive species of O2(˙-), OH˙ and h(+) were considered as the main participants for oxidizing 2,4-DCP, as confirmed by the free radical capture experiments. And some organic intermediates including 4-chlorophenol (4-CP), hydroquinone (HQ), benzoquinone (BZQ), 2-chlorohydroquinone and hydroxyhydroquinone (HHQ) were detected by comparison with the standard retention times from the high performance liquid chromatography (HPLC). In short, the enhanced photocatalytic property of Ag3PO4-GO was closely related to the strong absorption ability of GO relative to 2,4-DCP, the effective separation of photogenerated electron-hole pairs, and the excellent electron capture capability of GO.
authors.affiliation: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China.
authors.forename: Xiao-juan
authors.initials: XJ
authors.lastname: Chen
authors.affiliation: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China. Electronic address: daiyzh@xtu.edu.cn.
authors.forename: You-zhi
authors.initials: YZ
authors.lastname: Dai
authors.affiliation: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China.
authors.forename: Xing-yan
authors.initials: XY
authors.lastname: Wang
authors.affiliation: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Guo
authors.affiliation: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China.
authors.forename: Tan-hua
authors.initials: TH
authors.lastname: Liu
authors.affiliation: Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, PR China; Department of Environmental Science, Changsha Environmental Protection Vocational College, Changsha410004, PR China.
authors.forename: Fen-fang
authors.initials: FF
authors.lastname: Li
mesh_terms: D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D008027:Light; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010087:Oxides / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry*; D055668:Photochemical Processes; D018030:Silver Compounds / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission
chemical_list: D002733:Chlorophenols; D010087:Oxides; D010710:Phosphates; D018030:Silver Compounds; D006108:Graphite; C004762:2,4-dichlorophenol; C039072:silver phosphate
keywords: 2,4-Dichlorophenol; Ag(3)PO(4)–GO; Degradation intermediates; Photocatalytic mechanism; Visible light photocatalysis