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Synthesis of Ag@AgBr/CaTiO3 composite photocatalyst with enhanced visible light photocatalytic activity

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Abstract

A novel efficient visible light driven Ag@AgBr/CaTiO3 composite photocatalyst was successfully fabricated by deposition–precipitation method, followed by photo-reduction route. X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible diffuse reflectance spectra and photoluminescence emission spectra were employed to characterize the crystal structure, morphology, chemical composition and optical properties. The photocatalytic activity of the samples was evaluated by the degradation of methyl orange (MO) aqueous solution under visible light irradiation. The results showed that the loading amount of Ag@AgBr had a significant effect on the photocatalytic activity. Among the photocatalysts studied, the as-prepared Ag@AgBr/CaTiO3-3 photocatalyst presented the highest photocatalytic activity under visible light irradiation, degrading more than 98% of MO within 12 min. The enhanced photocatalytic performance could be attributed to the surface plasmon resonance effect induced by Ag nanoparticles, and the formed heterostructure at the interface of Ag@AgBr and CaTiO3, resulting in high separation efficiency of photogenerated electron and hole pairs. In addition, the trapping experiment results demonstrated that h+ and \(^{ \cdot }{{\text{O}}_2}^{ - }\) played the key roles for MO degradation. The possible degradation mechanism of MO over Ag@AgBr/CaTiO3 composite under visible light was tentatively proposed.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFC0209203), the Jiangsu Provincial Environmental Science Research Project of China (Grant No. 2015007), the Jiangsu Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipment Research Project of China (Grant No. CP201504).

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, People’s Republic of China

    Linyang Bai, Qi Xu & Zhaosheng Cai

  2. Jiangsu Institute of Tourism, Yangzhou, 225127, People’s Republic of China

    Linyang Bai

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  1. Linyang Bai
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  2. Qi Xu
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Correspondence to Qi Xu.

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Bai, L., Xu, Q. & Cai, Z. Synthesis of Ag@AgBr/CaTiO3 composite photocatalyst with enhanced visible light photocatalytic activity. J Mater Sci: Mater Electron 29, 17580–17590 (2018). https://doi.org/10.1007/s10854-018-9861-y

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