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A novel class of heterojunction photocatalysts with highly enhanced visible light photocatalytic performances: yBiO(ClxBr1−x)–(1 − y) bismuth oxide hydrate

Paper ID Volume ID Publish Year Pages File Format Full-Text
46364 46438 2012 8 PDF Available
Title
A novel class of heterojunction photocatalysts with highly enhanced visible light photocatalytic performances: yBiO(ClxBr1−x)–(1 − y) bismuth oxide hydrate
Abstract

A novel class of heterojunctioned bismuth oxyhalide photocatalysts yBiO(ClxBr1−x)–(1 − y)BHO (bismuth oxide hydrate) has been prepared by a simple hydrothermal method. The new materials are highly efficient under visible light irradiation (λ ≥ 420 nm) for the degradation of Rhodamine B (RhB), Acetophenone (AP) and photooxidation of iodide. Even though BHO shows very low photocatalytic efficiency, its combination with BiO(Cl0.5Br0.5) provides exceptional high photocatalytic activity due to more effective photo-excited electron–hole separation by the heterojunction semiconductor. The relationship between BHO amounts and the photocatalytic activities was investigated. Compared to Degussa P25 the composite with x = 0.5 and y = 0.9 demonstrated 14.6 times higher activity in removing aqueous RhB under visible light irradiation. The possible photodegradation mechanism was studied by the examination of different active species through adding appropriate scavengers. Furthermore, the photogenerated charge transfer process was proposed based on the bands positions of BiO(Cl0.5Br0.5) and BHO. After five cycles, the catalyst did not exhibit any significant loss of photocatalytic activity, confirming the photocatalyst is essentially stable. The excellent activity and photostability reveal that yBiO(ClxBr1−x)–(1 − y)BHO is a promising visible-light-responsive photocatalyst.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Synthesis of new visible light sensitive photocatalysts based on heterojunction of BiOClxBr1−x–bismuth oxyhydrate. ► Effective separation of photoexcited electrons and holes. ► 14.6 times higher photocatalytic activity compared to TiO2. ► Research of relationship between photocatalytic properties and chemistry and structure of photocatalyst.

Keywords
Visible light photocatalysis; Heterojunction; Bismuth oxyhydrate; Bismuth hydrate oxide; Bismuth oxyhalide
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A novel class of heterojunction photocatalysts with highly enhanced visible light photocatalytic performances: yBiO(ClxBr1−x)–(1 − y) bismuth oxide hydrate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 117–118, 18 May 2012, Pages 148–155
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