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Photocatalytic Reduction of CO2 into Methanol over Ag/TiO2 Nanocomposites Enhanced by Surface Plasmon Resonance

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Abstract

Ag-loaded TiO2 (Ag/TiO2) nanocomposites were prepared by microwave-assisted chemical reduction method using tetrabutyl titanate as the Ti source. The prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, N2 adsorption–desorption isotherms, UV–vis absorption spectrum, X-ray photoelectron spectrum, photoluminescence spectrum, and Raman scattering spectrum, respectively. Results revealed that Ag nanoparticles (NPs) were successfully deposited on TiO2 by reduction of Ag+, and the visible light absorption and Raman scattering of TiO2 were enhanced by Ag NPs based on its surface plasmon resonance effect. Besides, Ag NPs could also effectively restrain the recombination of photogenerated electrons and holes with a longer luminescence life time. In addition, photocatalytic reduction of CO2 with H2O on the composites was conducted to obtain methanol. Experimental results indicated that Ag-loaded TiO2 had better photocatalytic activity than pure TiO2 due to the synergistic effect between UV light excitation and surface plasmon resonance enhancement, and 2.5 % Ag/TiO2 exhibited the best activity; the corresponding energy efficiency was about 0.5 % and methanol yield was 405.2 μmol/g-cat, which was 9.4 times higher than that of pure TiO2. Additionally, an excitation enhancement synergistic mechanism was proposed to explain the experimental results of photocatalytic reduction of CO2 under different reaction conditions.

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Acknowledgments

This work was supported by the National natural Science Foundation of China (no. 21176199), the Scientific Research Foundation of Northwest University (no. 12NW19), the Scientific Research Staring Foundation of Northwest University (no. PR12216), the Shaanxi Provincial Research Foundation for Basic Research, China (grant no. 2013JQ2003), and the Scientific Research Foundation of the Education Department of Shaanxi Provincial Government, China (no. 2013JK0693).

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Authors and Affiliations

  1. School of Chemical Engineering, Northwest University, No. 229 Taibai North Road, Xi’an, Shaanxi, 710069, China

    Enzhou Liu, Limin Kang, Feng Wu, Yuhao Yang & Jun Fan

  2. School of Chemistry & Chemical Engineering, Nanjing University, Hankou Road, Nanjing, 210093, China

    Tao Sun

  3. Department of Physics, Northwest University, No. 229 Taibai North Road, Xi’an, Shaanxi, 710069, China

    Xiaoyun Hu

  4. School of Science, Xi’an Polytechnic University, No. 19 Jinhua South Road, Xi’an, Shaanxi, 710048, China

    Hanchen Liu

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  1. Enzhou Liu
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  8. Jun Fan
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Correspondence to Jun Fan.

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Enzhou Liu and Limin Kang are the co-first authors.

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Liu, E., Kang, L., Wu, F. et al. Photocatalytic Reduction of CO2 into Methanol over Ag/TiO2 Nanocomposites Enhanced by Surface Plasmon Resonance. Plasmonics 9, 61–70 (2014). https://doi.org/10.1007/s11468-013-9598-7

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