Photocatalytic property of surface-modified TiO2 nanobelts under visible light irradiation
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A novel plasmonic photocatalyst, i.e., acid-etched TiO2 nanobelts attached with Ag/AgI nanoparticles (NPs) was prepared by deposition–precipitation-photoreduction method. Such surface-modified nanobelts had larger area than the normal one. Ag NPs were formed from AgI by photo-reduction under Xenon lamp irradiation. X-ray diffraction, scanning electron microscopy analysis, UV–Vis diffuse reflectance spectra and fluorescence spectra were used to characterize the structure and optical properties of the sample. The obtained sample exhibited strong photodegradation of methyl orange (MO) under visible light irradiation, which were attributed to both the surface plasmon resonance of Ag NPs and the visible light actived AgI. The photodegradation was accomplished by the transfer of photoexcited electrons from the Ag NPs to the acid-etched TiO2 nanobelts. After four cycles of photodegradation the photocatalyst was still stable. This novel photocatalyst had a high potential application in wastewater-treatment and biomedical engineering.
KeywordsAcid-etched TiO2 nanobelts Surface plasmon resonance Ag/AgI Photodegradation
This work was supported by the National Natural Science Foundation of China (Grant No. 50872076), the Open Research Fund Program of State Key Laboratory of Crystal materials (Grant No. KF0905), and the Ministry of Education of Shandong Province (Grant No. J09LD23). The authors also thank the Analytical Center of Shandong Institute of Light Industry for the technological support.
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