Photocatalytic reduction of CO2 over Sm-doped TiO2 nanoparticles |
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| Affiliation: | 1. School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200240, China;2. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;3. Shanghai Engineering Research Center of Power Generation Environment Protection, Shanghai 200090, China;4. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China;1. Institute of Environmental Technology, VŠB-TU Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic;2. Faculty of Chemistry, Jagiellonian University in Kraków, ul. Ingardena 3, 30-060 Kraków, Poland;3. Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16 Prague 2, Czech Republic;4. Centre ENET, VŠB-TU Ostrava, 17. listopadu 15/2172, 708 33 Ostrava, Czech Republic;1. Department of Physics, National Institute of Technology, Kurukshetra 136119, India;2. Centre for Materials Science & Engineering, National Institute of Technology, Hamirpur 177005, India;1. Department of Chemical Engineering, MNIT, Jaipur 302017, India;2. Chemical Engineering Department, Institute of Chemical Technology, Matunga, Mumbai 400019, India;1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China;2. Material and Metallurgy College, Guizhou University, Guiyang, 550025, China;3. Department of Ecosystem Science and Management and Materials Research Institute, 205 Materials Research Laboratory, The Pennsylvania State University, University Park, PA, 16802, USA |
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| Abstract: | Highly efficient photocatalytic reduction of CO2 is essential for solving the greenhouse effect and energy crisis. In this paper, the Sm-TiO2 nanocomposites were successfully prepared via sol-gel method. The CO2 photoreduction activities of synthesized samples were tested under irradiation for 6 h and the results indicate that the 0.5% Sm-TiO2 catalyst has superior performance and stability. The CO and CH4 yields of 0.5% Sm-TiO2 catalyst are 55.47 and 3.82 μmol/g·cat respectively, which are 5.02 and 2.67 times the yield of TiO2. The possible mechanism of Sm doped TiO2 was investigated through comprehensive characterization and photoelectrochemical analysis. After the Sm doping, the photo-generated electrons in TiO2 could migrate to Sm 4f, and some of them can be captured by reducing Sm3+ to Sm2+, which can lower the recombination rate of electron and hole pairs. Therefore, the enhanced photocatalytic performance could be ascribed to large specific surface area, fast separation rate of electron–hole pairs and high visible light response. This report provides some meaningful attempts in researching the CO2 photocatalytic reduction. |
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| Keywords: | Photocatalyst Electron–hole pairs Rare earths |
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