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A plasmonic photocatalyst of Ag@AgBr/La2Ti2O7 with enhanced photocatalytic activity under visible light irradiation

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Abstract

In this paper, a plasmonic photocatalyst of Ag@AgBr/La2Ti2O7 was synthesized through a chemical precipitation method followed by a photoreduction process. The crystallinity, morphology, chemical composition, and optical properties of the as-prepared samples were characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectrum. The photocatalytic activity of the samples was investigated toward the degradation of rhodamine B (RhB) under visible light irradiation. Among the obtained photocatalysts, Ag@AgBr/La2Ti2O7 displayed the highest photocatalytic activity, degrading approximate 98% of RhB within 8 min of visible light illumination. The superior photocatalytic activity of Ag@AgBr/La2Ti2O7 was attributed to the formation of heterojunctions between Ag@AgBr and La2Ti2O7 as well as the surface plasmon resonance effect of Ag nanoparticles (NPs), which would be conducive to the efficient separation of photogenerated electrons and holes. The active species trapping experiments indicated that \(\cdot {\text{O}}_{2}^{ - }\) and \({\text{h}}^{ + }\) were the main reactive species responsible for RhB degradation. Furthermore, a possible photocatalytic mechanism for RhB decomposition over Ag@AgBr/La2Ti2O7 was proposed.

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Acknowledgements

This work was supported by the Jiangsu Provincial College Natural Science General Program (19KJD530002) and the National Natural Science Foundation of China (32071706).

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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, Zhaosheng Cai & Qi Xu

  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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  3. Qi Xu
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Correspondence to Zhaosheng Cai.

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Bai, L., Cai, Z. & Xu, Q. A plasmonic photocatalyst of Ag@AgBr/La2Ti2O7 with enhanced photocatalytic activity under visible light irradiation. Appl. Phys. A 127, 595 (2021). https://doi.org/10.1007/s00339-021-04727-y

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