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Novel BiOI/BiOBr heterojunction photocatalysts with enhanced visible light photocatalytic properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
50234 46785 2011 6 PDF Available
Title
Novel BiOI/BiOBr heterojunction photocatalysts with enhanced visible light photocatalytic properties
Abstract

A novel heterojunction photocatalyst BiOI/BiOBr was synthesized by a simple modified deposition–precipitation method. Several characterization tools including XRD, SEM, HRTEM and UV–vis DRS were employed to study the phase structures, morphologies and optical properties of the samples. BiOI/BiOBr exhibited higher photocatalytic activity than single BiOI and BiOBr for the degradation of methyl orange (MO) under visible light (λ > 420 nm). This result can be due to the formation of the heterojunction between BiOI and BiOBr, which can separate photogenerated carriers efficiently. The photocatalytic mechanism study demonstrates that O2− and h+ are the main reactive species while OH can be negligible.

Graphical abstractNovel BiOI/BiOBr heterojunction photocatalysts were synthesized by a facile modified deposition–precipitation method and exhibited higher photo-activities than single BiOI and BiOBr under visible light irradiation (λ > 420 nm) in the process of methyl orange (MO) degradation. The formation of the BiOI/BiOBr heterojunction is responsible for the enhanced photo-activities of BiOI/BiOBr, which can facilitate separation of photogenerated carriers. The superoxide radical anions (O2−) and holes (h+) were proven to be the main reactive species in the BiOI/BiOBr photocatalysis.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights►BiOI/BiOBr was prepared by a simple modified deposition–precipitation method. ►BiOI/BiOBr displayed higher photocatalytic activity than single BiOI and BiOBr. ►O2− radicals and h+ were proven to be the main reactive species. ►The formation of BiOI/BiOBr heterojunction plays a key role in the photocatalysis.

Keywords
Photocatalysis; BiOI/BiOBr; Heterojunction; Methyl orange
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Novel BiOI/BiOBr heterojunction photocatalysts with enhanced visible light photocatalytic properties
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 13, Issue 1, 5 October 2011, Pages 63–68
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