Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 285, Issue -, Pages 319-324Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2014.12.020
Keywords
Ag2O nanowire; Self-stability; TiO2 nanotube array; p-n heterojunction; Photocatalysis
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Funding
- Hunan Provincial Natural Science Foundation of China [14JJ1015]
- Program for Innovation Research Team in University [IRT1238]
- National Natural Science Foundation of China [51178173, 51238002, 51272099, 51478171]
- Program for New Century Excellent Talents in University [NCET-11-0126]
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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. (C) 2014 Elsevier B.V. All rights reserved.
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