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TiO2–Hydroxyapatite Composite as a New Support of Highly Active and Sintering-Resistant Gold Nanocatalysts for Catalytic Oxidation of CO and Photocatalytic Degradation of Methylene Blue

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Abstract

Supported gold catalysts have attracted intensive interest due to their unique catalytic properties. The easy sintering of gold particles, however, is still the major obstacle to the practical application of gold catalysts. Herein, a highly active and sintering-resistant TiO2–hydroxyapatite (HAP, Ca10(PO4)6(OH)2) composite supported gold catalyst was prepared by a deposition–precipitation method. TEM results manifested TiO2–HAP had smaller gold nanoparticles than TiO2 and HAP. Patterns of TG–DTG revealed that the presence of HAP inhibited the phase transformation from anatase to rutile. Based on UV–Vis and BET studies, HAP prevented the formation of large TiO2 agglomerates, leading to higher dispersion of TiO2 nanoparticles in TiO2–HAP composites. Au/TiO2–HAP had the higher activity and sintering-resistance compared with Au/TiO2 and Au/HAP for CO oxidation. TiO2–HAP and Au/TiO2–HAP exhibited the best photocatalytic activity among supports and gold nanocatalysts, respectively. Gold nanoparticles could further improve the photocatalytic performance. It was likely that the synergistic interaction among gold nanoparticles, TiO2 and HAP was responsible for the high activity and sintering-resistance of Au/TiO2–HAP.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21271110 21373120 and 21271107) and MOE Innovation Team of China (IRT13022).

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Authors and Affiliations

  1. Department of Chemistry, Key Laboratory of Advanced Energy Material Chemistry (MOE), and TKL of Metal and Molecule Based Material Chemistry, Nankai University, Tianjin, 300071, People’s Republic of China

    Jiuli Guo, Feng Dong, Siyuan Zhong, Baolin Zhu, Weiping Huang & Shoumin Zhang

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  1. Jiuli Guo
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  2. Feng Dong
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  3. Siyuan Zhong
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Correspondence to Shoumin Zhang.

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Guo, J., Dong, F., Zhong, S. et al. TiO2–Hydroxyapatite Composite as a New Support of Highly Active and Sintering-Resistant Gold Nanocatalysts for Catalytic Oxidation of CO and Photocatalytic Degradation of Methylene Blue. Catal Lett 148, 359–373 (2018). https://doi.org/10.1007/s10562-017-2245-8

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