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Z-scheme heterojunction Ag/AgBr/Bi$_2$MoO$_6$ with improved visible-light-induced photocatalytic activity
LIFANG CHEN LI DING HONGYE CHENG ZHIWEN QI
Volume 45 Published: 30 June 2022 Article ID 0121
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Fulltext
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https://www.ias.ac.in/article/fulltext/boms/045/0121 -
Keywords
Bi$_2$MoO$_6$ ;Ag/AgBr ;Z-scheme ;visible light ;photocatalysis. -
Abstract
A hierarchical Ag/AgBr/Bi$_2$MoO$_6$ heterojunction composite was prepared without the addition of any structure-directing agent via a hydrothermal synthesis combined with subsequent deposition-photoreduction. The obtained samples were characterized by X-ray diffraction, field-emission scanning electron microscopy containing an energy X-ray dispersive spectrometer, X-ray photoelectron spectroscopy, UV–visible diffuse reflectance spectroscopy and photoluminescence spectroscopy. The results demonstrate that the Ag/AgBr/Bi$_2$MoO$_6$ composite exhibited enhanced photocatalytic activity under visible-light irradiation for rhodamine B degradation with a rate constant of 0.180 min$^{–1}$, which was approximately 2.5 times than that of Ag/AgBr and 22.5 times as high as Bi$_2$MoO$_6$. In addition, the superior visible light removing efficiencies of methylene blue and colourless phenol further confirmed the broad-spectrum photocatalytic degradation abilities of the Ag/AgBr/Bi$_2$MoO$_6$. Moreover, based on band structure analysis and active species trapping experiments, the improved photocatalytic performance of the Ag/AgBr/Bi$_2$MoO$_6$ photocatalyst was ascribed to the construction of Z-scheme bridge using Ag nanoparticles, which could increase the separation efficiency of photogenerated electron–hole pairs and keep them with high reduction and oxidation capability.
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Author Affiliations
LIFANG CHEN1 LI DING HONGYE CHENG ZHIWEN QI
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
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Dates
- Published
- 30 June 2022
- Manuscript received
- 10 December 2021
- Accepted
- 12 February 2022
- Final version published online
- 30 June 2022
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Volume 46, 2023
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