Journal
SURFACE & COATINGS TECHNOLOGY
Volume 242, Issue -, Pages 20-28Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.01.006
Keywords
TiO2 nanotube arrays; CdSe nanoparticles; Photocatalytic activity; Visible light
Funding
- National Natural Science Foundation of China [51172059, 91023030, 51072044, 51102071]
- Anhui Province Natural Science Foundation [11040606 M54]
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Highly ordered TiO2 nanotube arrays (NTAs) were fabricated on titanium substrate via electrochemical anodization method. CdSe nanopartides were deposited on the TiO2 NTAs through the electrodeposition process. The influence of electrolyte concentration and deposition time on the visible light photocatalytic performance of CdSe/TiO2 NTAs was studied systematically. The photocatalytic activity of as-prepared samples was evaluated by degradation of methyl orange under visible light irradiation. The results indicated that the CdSe nanoparticles distributed uniformly on the surface of TiO2 NTAs when deposited in the electrolyte containing 0.02 M CdCl2, 2 mM SeO2 and 0.02 M Na2SO4 with time of 600 s. After irradiation under visible light for 2 h, the degradation rate of CdSe/TiO2 NTAs composite material reached 94.4%, while the degradation rate of unmodified TiO2 NTAs was only 62% under the same condition, demonstrating that the CdSe/TiO2NTAs exhibited higher photocatalytic activity in visible light region. In addition, a reasonable degradation rate of 80.96% was achieved even after being used for 5 times. (C) 2014 Elsevier B.V. All rights reserved.
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