title: Ag-bridged Ag2O nanowire network/TiO2 nanotube array p-n heterojunction as a highly efficient and stable visible light photocatalyst.
abstract: A unique Ag-bridged Ag2O nanowire network/TiO2 nanotube array p-n heterojunction (Ag-Ag2O/TiO2 NT) was fabricated by simple electrochemical method. Ag nanoparticles were firstly electrochemically deposited onto the surface of TiO2 NT and then were partly oxidized to Ag2O nanowires while the rest of Ag mother nanoparticles were located at the junctions of Ag2O nanowire network. The Ag-Ag2O/TiO2 NT heterostructure exhibited strong visible-light response, effective separation of photogenerated carriers, and high adsorption capacity. The integration of Ag-Ag2O self-stability structure and p-n heterojunction permitted high and stable photocatalytic activity of Ag-Ag2O/TiO2 NT heterostructure photocatalyst. Under 140-min visible light irradiation, the photocatalytic removal efficiency of both dye acid orange 7 (AO7) and industrial chemical p-nitrophenol (PNP) over Ag-Ag2O/TiO2 NT reached nearly 100% much higher than 17% for AO7 or 13% for PNP over bare TiO2 NT. After 5 successive cycles under 600-min simulated solar light irradiation, Ag-Ag2O/TiO2 NT remained highly stable photocatalytic activity.
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China; State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China. Electronic address: chem_cbliu@hnu.edu.cn.
authors.forename: Chengbin
authors.initials: C
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China.
authors.forename: Chenghao
authors.initials: C
authors.lastname: Cao
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
authors.forename: Xubiao
authors.initials: X
authors.lastname: Luo
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China; State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, PR China.
authors.forename: Shenglian
authors.initials: S
authors.lastname: Luo
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D001557:Benzenesulfonates / Q000737:chemistry; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry; D008027:Light; D043942:Nanotubes / Q000737:chemistry / Q000528:radiation effects; D053770:Nanowires / Q000737:chemistry / Q000528:radiation effects; D009596:Nitrophenols / Q000737:chemistry; D010087:Oxides / Q000737:chemistry / Q000528:radiation effects; D012834:Silver / Q000737:chemistry / Q000528:radiation effects; D018030:Silver Compounds / Q000737:chemistry / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry / Q000528:radiation effects; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D009596:Nitrophenols; D010087:Oxides; D018030:Silver Compounds; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D012834:Silver; C040225:disilver oxide; D014025:Titanium; C014722:2-naphthol orange; C024836:4-nitrophenol
keywords: Ag(2)O nanowire; Photocatalysis; Self-stability; TiO(2) nanotube array; p–n heterojunction