Enhanced photocatalytic performance of MoS2 modified by AgVO3 from improved generation of reactive oxygen species

doi:10.1016/S1872-2067(18)63111-0

Abstract

Abstract:

In this work, an efficient AgVO₃/MoS₂ composite photocatalyst was successfully synthesized via a hydrothermal method. The photocatalytic activity of the as-prepared photocatalyst was evaluated by using it for assessing the degradation of different organic pollutants under visible-light irradiation. The composite 3%-AgVO₃/MoS₂ catalyst demonstrated a significantly enhanced photocatalytic activity compared to the pure compounds (AgVO₃ and MoS₂). The reason behind the excellent photocatalytic performance was the modification of MoS₂ by AgVO₃ to facilitate O₂ adsorption/activation. In addition, the composite catalyst facilitates the two-electron oxygen reduction reaction whereby H₂O₂ is generated on the surface of MoS₂ to produce additional reactive oxygen species (ROSs). ESR coupled with the POPHA fluorescence detection method and a free radical capture experiment were used to elucidate the mechanism of formation of the ROSs, including ·OH, ·O₂^- and H₂O₂. Furthermore, the generation of additional ROSs could accelerate electron consumption, leaving behind more holes for the oxidation of organic pollutants. A possible photocatalytic mechanism of the composite is also discussed.

Key words: Reactive oxygen specie, AgVO₃/MoS₂, Photocatalyst, Visible light, Organic pollutant

Yingying Qin, Hong Li, Jian Lu, Yongsheng Yan, Ziyang Lu, Xinlin Liu. Enhanced photocatalytic performance of MoS₂ modified by AgVO₃ from improved generation of reactive oxygen species[J]. Chinese Journal of Catalysis, 2018, 39(9): 1470-1483.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63111-0

https://www.cjcatal.com/EN/Y2018/V39/I9/1470

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Enhanced photocatalytic performance of MoS₂ modified by AgVO₃ from improved generation of reactive oxygen species

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