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Easily recycled Bi2O3 photocatalyst coatings prepared via ball milling followed by calcination

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Abstract

Bi2O3 photocatalyst coatings derived from Bi coatings were first prepared by a two-step method, namely ball milling followed by the calcination process. The as-prepared samples were characterized by XRD, SEM, XPS and UV–Vis spectra, respectively. The results showed that monoclinic Bi2O3 coatings were obtained after sintering Bi coatings at 673 or 773 K, while monoclinic and triclinic mixed phase Bi2O3 coatings were obtained at 873 or 973 K. The topographies of the samples were observably different, which varied from flower-like, irregular, polygonal to nanosized particles with the increase in calcination temperature. Photodegradation of malachite green under simulated solar irradiation for 180 min showed that the largest degradation efficiency of 86.2% was achieved over Bi2O3 photocatalyst coatings sintered at 873 K. The Bi2O3 photocatalyst coatings, encapsulated with Al2O3 ball with an average diameter around 1 mm, are quite easily recycled, which provides an alternative visible light-driven photocatalyst suitable for practical water treatment application.

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Acknowledgements

This work was supported by the Youth Innovation Foundation of Tianjin University of Science and Technology (No. 2015LG11), the Innovation Team Program of Tianjin University of Science and Technology (No. 10117) and the National Nature Science Foundation of China (No. 51404170).

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Authors and Affiliations

  1. Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry and Food Machinery and Equipment, College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin, 300222, People’s Republic of China

    Lijun Cheng, Xumin Hu & Liang Hao

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  1. Lijun Cheng
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  2. Xumin Hu
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  3. Liang Hao
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Correspondence to Liang Hao.

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Cheng, L., Hu, X. & Hao, L. Easily recycled Bi2O3 photocatalyst coatings prepared via ball milling followed by calcination. Appl. Phys. A 123, 443 (2017). https://doi.org/10.1007/s00339-017-1051-x

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