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Facile synthesis of BiOBr/Bi2WO6 heterojunction semiconductors with high visible-light-driven photocatalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
26587 43965 2015 12 PDF Available
Title
Facile synthesis of BiOBr/Bi2WO6 heterojunction semiconductors with high visible-light-driven photocatalytic activity
Abstract

•The BiOBr/Bi2WO6 heterojunction photocatalysts were successfully synthesized by the facile hydrothermal method.•The new materials were characterized via some techniques including XRD, XPS, SEM and TEM etc.•The photocatalytic performance of the composites were performed by degrading Rhodamine B. It comes out with high degradation efficiency and the influence of the doping amount was also explored.•Mechanisms of the improvement in photocatalytic activity by establishing heterojunction was discussed based on the electrical structure.

Photocatalysis is a growing area of study for a clean and renewable energy source, particularly the degradation of organics in wastewater and polluted air. Researchers have studied the combination of various semiconductors to create photocatalysts with improved activities, but little has been reported in selecting semiconductors based on their extrinsic type—namely n-type or p-type. In this study, a BiOBr (p-type)-Bi2WO6 (n-type) heterojunction semiconductor was synthesized by the hydrothermal method. The new materials were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and diffuse-reflection spectroscopy (DRS). Their photocatalytic activities were examined by measuring the degradation rate of Rhodamine B with photocatalysts synthesized using various atomic ratios of BiOBr and Bi2WO6 (1:4, 1:1, and 4:1). These new composites’ ability to effectively degrade dye pollutants shed light on the benefits of using heterojunction photocatalysts, and also on the importance of considering the semiconductor type when forming composite photocatalysts.

Graphical abstractThe graph could be used to explain the enhancement effect of heterojunction in photocatalytic performance. Photo-generated electrons and holes could move oppositely and accumulate on conduction band of Bi2WO6 and valence band of BiOBr, respectively, which could decrease the recombination rate so as to improve the photocatalytic activity of the semiconductors.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
BiOBr; Bi2WO6; Heterojunction; Photocatalysts; Rhodamine B
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Facile synthesis of BiOBr/Bi2WO6 heterojunction semiconductors with high visible-light-driven photocatalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 310, 1 September 2015, Pages 33–44
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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