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Thermodecomposition synthesis of WO3/H2WO4 heterostructures with enhanced visible light photocatalytic properties

Paper ID Volume ID Publish Year Pages File Format Full-Text
46474 46440 2012 9 PDF Available
Title
Thermodecomposition synthesis of WO3/H2WO4 heterostructures with enhanced visible light photocatalytic properties
Abstract

Novel WO3/H2WO4 heterostructures with different contents of WO3 were synthesized through a simple thermodecomposition method. Thermogravimetry and differential thermal analysis (TG–DTA), X-ray powder diffraction (XRD), Fourier transform infrared spectrometry (FT-IR), UV–vis diffuse reflectance spectroscopy (DRS) and N2 adsorption and desorption isotherms were employed to study the structures, morphologies, optical properties and specific surface area of the as-prepared samples. Degradation of rhodamine B (RhB) was carried out to evaluate the photocatalytic activity of samples under visible light irradiation (λ > 420 nm). WO3/H2WO4 heterostructure with 51.04 wt% WO3 presented the highest photocatalytic activity with apparent kapp of 0.0330 min−1. The increased photocatalytic activity of WO3/H2WO4 could be attributed to the formation of the heterojunction between WO3 and H2WO4, which suppresses the recombination of photoinduced electron–hole pairs. Moreover, the tests of radical scavengers confirmed that O2− and h+ were the main reactive species for the degradation of RhB.

Graphical abstractNovel WO3/H2WO4 heterostructures were synthesized through a simple thermodecomposition method. The WO3/H2WO4 heterostructures exhibited enhanced photocatalytic activity compared to single WO3 and H2WO4 toward degradation of rhodamine B (RhB) under visible light irradiation (λ > 420 nm). The resulting O2− and active h+ played the major roles for the degradation of RhB while OH was verified to be insignificant. The formation of heterojunction between WO3 and H2WO4 is responsible for the enhanced photoactivities of WO3/H2WO4, which can facilitate separation of photoinduced carriers.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► WO3/H2WO4 heterostructure is a novel composite photocatalyst. ► WO3/H2WO4 was synthesized via partial thermodecomposition method. ► WO3/H2WO4 displays excellent visible light photocatalytic activity (λ > 420 nm). ► The resulting O2− and active h+ played the major roles for RhB degradation. ► Partial thermodecomposition offers a new way to design composite photocatalysts.

Keywords
WO3/H2WO4; Thermodecomposition; Photocatalytic activity; Mechanism
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Thermodecomposition synthesis of WO3/H2WO4 heterostructures with enhanced visible light photocatalytic properties
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 111–112, 12 January 2012, Pages 288–296
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