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Efficient organic degradation under visible light by α-Bi2O3 with a CuOx-assistant electron transfer process

Paper ID Volume ID Publish Year Pages File Format Full-Text
44879 46375 2015 10 PDF Available
Title
Efficient organic degradation under visible light by α-Bi2O3 with a CuOx-assistant electron transfer process
Abstract

•Photocatalytic activity α-Bi2O3 of was significantly and universally improved.•The mechanism was performed by measuring the photogenerated OH and H2O2.•The chemical state of the CuOx is the coexistence of Cu(II) clusters, CuO and Cu.•A CuOx-assistant electron transfer process (CuOx-AETP) was suggested.

In this study, we have found that CuOx modified α-Bi2O3 is an excellent photocatalytic material for the visible-light-driven degradation of various organic compounds including RhB, MO, 2,4-DCP, and gaseous IPA. A detailed study on the mechanism of the photocatalytic reaction was performed by measuring the photogenerated OH and H2O2 under visible light irradiation. The results indicate that modifying CuOx on the surface of α-Bi2O3 significantly promotes the separation of the photogenerated electrons and holes of α-Bi2O3. The important role of CuOx was further investigated by detecting the valence states change of Cu before and after the photocatalysis, using ESR and XPS. It was found that, the Cu states within the CuOx clusters are the coexistence of Cu(II) clusters, CuO and Cu. As a result, the enhancement of photocatalytic activity by CuOx modification can be attributed to a CuOx-assistant electron transfer process (CuOx-AETP), which involves in two electron excitation paths and a Cu cycle of different valence states.

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Keywords
Photocatalyst; α-Bi2O3; CuOx modification; CuOx-assistance electron transfer process (CuOx-AETP); Cu cycle
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Efficient organic degradation under visible light by α-Bi2O3 with a CuOx-assistant electron transfer process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 163, February 2015, Pages 267–276
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us