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New efficient visible light photocatalyst based on heterojunction of BiOCl–bismuth oxyhydrate

Paper ID Volume ID Publish Year Pages File Format Full-Text
41087 45877 2012 9 PDF Available
Title
New efficient visible light photocatalyst based on heterojunction of BiOCl–bismuth oxyhydrate
Abstract

A novel active photocatalyst, which is a heteroconjuction of a bismuth oxyhydrate and BiOCl, has been synthesized by a simple hydrothermal method. The photocatalytic activity of the new material was measured in the degradation of Rhodamine B (RhB) and Acetophenone (AP) and in the photocatalytic oxidation of iodide in water under UV–vis and visible light irradiations respectively. The heterojunction between bismuth oxyhydrate and BiOCl provided exceptional photocatalytic activity, whereas both the individual bismuth oxyhydrate and BiOCl showed a negligible efficiency. Compared to Degussa P25, the new composite material demonstrated 5 times higher activity in removing aqueous RhB under visible light (λ ≥ 420 nm) irradiation. The chemical composition and crystal structure were investigated using powder X-ray diffraction, scanning and transmission electron microscopy, and thermal methods. The preliminary study has revealed the bismuth oxyhydrate has tetragonal crystal structure with unit cell parameters a = b = 5.674 Å, c = 10.353 Å, unit cell volume V = 333.3 Å3 and possible P4/mmm (No. 123) space group. Temperature behavior of new photocatalyst has been investigated. It was found that at heating to 550 °C for 45 min the new phase transforms into well-known monoclinic Bi2O3.

Graphical abstractNew efficient visible light photocatalyst based on heterojunction of BiOCl–bismuth oxyhydrate has been synthesized, its properties and photocatalytic activity have been studied.Figure optionsDownload full-size imageDownload high-quality image (214 K)Download as PowerPoint slideHighlights► Synthesis of new visible light sensitive photocatalysts based on heterojunction of BiOCl–bismuth oxyhydrate. ► 5 times higher photocatalytic activity compared to TiO2. ► Preliminary study of crystal structure and thermal behavior of synthesized bismuth oxyhydrate.

Keywords
Visible light photocatalysis; Heteroconjuction; Bismuth oxyhydrate; Bismuth hydroxide; Bismuth oxychloride; Thermal decomposition
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New efficient visible light photocatalyst based on heterojunction of BiOCl–bismuth oxyhydrate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 413–414, 31 January 2012, Pages 1–9
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