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In-situ detection technique for charge transfer behavior of direct Z-scheme BiVO4/UiO-66-NH2 composites during photocatalytic thioanisole conversion.
- Source :
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Chemical Engineering Journal . Sep2023, Vol. 472, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- • In situ growth of BiVO 4 nanoparticles on UiO-66-NH 2 octahedral surfaces by hydrothermal synthesis. • The Z-scheme charge transfer pathway of BVO/U6N composite was further demonstrated by in-situ XPS. • The superoxide radical is the key reaction species in photocatalytic system. • Photocatalytic conversion of thioanisole to sulfoxide showed excellent yields and selectivity by BVO/U6N under visible light. The photocatalytic efficiency can be enhanced by constructing Z-scheme heterostructures. However, there is still a lack of comprehensive and direct evidence regarding the charge transfer pathway and mode during the photocatalytic process. A composite photocatalyst BiVO 4 /UiO-66-NH 2 (BVO/U6N) was prepared by in-situ loading BiVO 4 nanoparticles onto the surface of UiO-66-NH 2 using a hydrothermal method. This catalyst effectively promotes the photocatalytic conversion of thioanisole to sulfoxide. The differences between BiVO 4 and UiO-66-NH 2 in band structure and Fermi energy level enable the composite to act according to the Z-scheme charge transfer pattern, which significantly enhances charge separation efficiency. In-situ X-ray photoelectron spectroscopy (in-situ XPS) combined with DFT calculation confirmed the transfer of electrons from UiO-66-NH 2 to BiVO 4 , driven by an internal electric field (IEF) upon hybridization. This demonstrates the formation of a Z-scheme photogenerated charge transfer pathway in the BVO/U6N composite. The direct Z-scheme system significantly enhances the carrier redox, resulting in a sulfoxide yield of 95.21% for the optimized sample in methanol, which is 5 times and 4.1 times higher than that of UiO-66-NH 2 and BiVO 4 , respectively. BVO/U6N exhibits efficient photocatalysis and selectivity towards various substrate sulfides, making it a highly promising heterogeneous photocatalyst. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13858947
- Volume :
- 472
- Database :
- Academic Search Index
- Journal :
- Chemical Engineering Journal
- Publication Type :
- Academic Journal
- Accession number :
- 169967018
- Full Text :
- https://doi.org/10.1016/j.cej.2023.144750