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Synthesis of Ag3PO4/Bi2MoO6 heterojunction with enhanced visible-light-driven photocatalytic activity via the hydrothermal method

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Abstract

The single-step hydrothermal method was used to synthesize Ag3PO4/Bi2MoO6 (APO/BMO) composites. The effects of the APO/BMO molar ratio, synthesis temperature and synthesis time on the photocatalytic activity of APO/BMO composites were determined. C.I. Reactive Red 2 (RR2) was selected as the target compound to test the photocatalytic activity of the prepared photocatalysts under irradiation by visible-light (Vis.). The surface characteristics of APO/BMO composites were measured using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV–Vis spectrophotometry, surface area analysis and X-ray photoelectron spectrometry. The photodegradation of RR2 in all Vis./APO/BMO systems followed pseudo-first-order kinetics. The optimal APO/BMO molar ratio for generating APO/BMO composites was 1 (AB1) and the RR2 photodegradation rate constant of the Vis./AB1 system was 0.098 ± 0.012 min−1. The optimal conditions for AB1 synthesis were heating at 160 °C for 12 h. The photocatalytic activity of mechanically mixed APO and BMO was lower than that of APO/BMO composites. This study suggests that the formation of a heterojunction in the APO/BMO composites may improve their photocatalytic activity by inhibiting the recombination of photo-excited electron–hole pairs. The experimental results of scavenger suggested that photocatalytic RR2 degradation over AB1 was dominated by direct photo-generated hole oxidation.

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Acknowledgements

The authors would like to thank the Ministry of Science and Technology for financially supporting this research under Contract No. MOST 110-2221-E-992-026-MY2.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, 415 Chien Kung Road, Kaohsiung, Taiwan

    Chung-Hsin Wu & Yu-Yen Chang Chien

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  1. Chung-Hsin Wu
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  2. Yu-Yen Chang Chien
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Contributions

Both authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Y-YCC. The first draft of the manuscript was written by C-HW and both authors commented on previous versions of the manuscript. Both authors read and approved the final manuscript.

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Correspondence to Chung-Hsin Wu.

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Wu, CH., Chien, YY.C. Synthesis of Ag3PO4/Bi2MoO6 heterojunction with enhanced visible-light-driven photocatalytic activity via the hydrothermal method. Reac Kinet Mech Cat 135, 3317–3329 (2022). https://doi.org/10.1007/s11144-022-02311-w

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