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TiO2/carbon nanotube hybrid nanostructures: Solvothermal synthesis and their visible light photocatalytic activity |
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| Authors: | Lihong Tian Liqun Ye Ling Zan |
| Institution: | a College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P.R. China b College of Chemistry & Chemical Engineering, Hubei University, Wuhan 430062, P.R. China c Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, South-Central University for Nationalities, Wuhan 430074, P.R. China |
| Abstract: | MWCNT/TiO2 hybrid nanostructures were prepared via solvothermal synthesis and sol-gel method with benzyl alcohol as a surfactant. As-prepared hybrid materials were characterized by X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectra and X-ray photoelectron spectroscopy. The results showed that MWCNTs were uniformly decorated with anatase nanocrystals in solvothermal condition, but MWCNTs were embedded in a majority of TiO2 nanoparticles by sol-gel method. When the weight ratio of MWCNTs to TiO2 was 20%, MWCNT/TiO2 hybrid nanostructures prepared by solvothermal synthesis exhibited higher visible-light-driven photocatalytic activity than that prepared by sol-gel method. Post-annealing of MWCNT/TiO2 nanostructures at 400 °C resulted in the formation of the carbonaceous Ti-C bonds on the interface between TiO2 and MWCNTs, which enhanced the photoabsorbance of the hybrid materials in the visible light region and improved the visible-light degradation efficiency of methylene blue. |
| Keywords: | TiO2/MWCNTs Hybrid materials Ti-C bond Photocatalytic degradation |
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