Alkali-free synthesis of a novel heterostructured CeO2-TiO2 nanocomposite with high performance to reduce Cr(VI) under visible light |
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| Authors: | Hualin Jiang Menglin Li Jun Liu Xueqin Li Lei Tian Pinghua Chen |
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| Affiliation: | 1. Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang 330063, PR China;2. College of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, PR China |
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| Abstract: | In this study, a novel CeO2-TiO2 nanocomposite denoted as CeO2-3TiO2 was successfully synthesized via a facile one pot hydro-thermal method without alkali. It exhibits high photocatalytic reduction reactivity toward Cr(VI) under visible light. The photocatalytic reactivity of CeO2-3TiO2 is 18 times higher than that of pure CeO2, 28 times higher than pure TiO2, 15 times higher than the sample of simply mixed CeO2 and TiO2. The solution with Cr(VI) initial concentration of 2780 ppb can be fast photoreduced by CeO2-3TiO2 in 60 min under visible light to meet the criterion of U.S. Environmental protection Agency. Characterization results indicate CeO2-3TiO2 has the good crystal form of heterojunction structure, narrow pore size distribution, narrow energy gap and high photogenerated electron-hole separation efficiency. Based on the experimental results, a speculated photocatalytic mechanism was proposed. |
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| Keywords: | Cr(VI) treatment CeO2 TiO2 Photocatalysis Nanocomposite |
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