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Visible light photocatalytic activity enhancement for water purification in Cu(II)-grafted WO3 thin films grown by photoreaction of nanoparticles

Paper ID Volume ID Publish Year Pages File Format Full-Text
46766 46448 2011 7 PDF Available
Title
Visible light photocatalytic activity enhancement for water purification in Cu(II)-grafted WO3 thin films grown by photoreaction of nanoparticles
Abstract

We have developed a simple process for improving the visible light photocatalytic activity in Cu(II)-grafted WO3 thin films, called ‘the photoreaction of nanoparticles’ (PRNP). The films prepared by PRNP showed an enhanced photodegradation rate for an organic dye. Glass substrates were coated with WO3 nanoparticles (5–30 nm) obtained by wet ball milling, and a post-treatment of either conventional heating or PRNP using KrF laser irradiation was carried out. Compared with the conventional heat treatment at 500 °C, PRNP significantly enhanced surface crystallite growth; pulsed photothermal gradient heating and photochemical stimulation increased the formation of new bonds between nanoparticles. The crystallite size near the surface of the WO3 film after 7500 pulses of laser irradiation increased to 70 nm, while it was largely-unchanged in the sample prepared by heat treatment at 500 °C. The photocatalytic dye degradation under visible light irradiation was measured for the samples after Cu(II)-grafting, and showed that the degradation rate of the sample prepared by the PRNP process was 2.8-fold higher than that of the sample prepared by heating at 500 °C. We propose that the improved surface crystallinity of WO3 thin films after the PRNP process stimulates the photoexcited electron/hole transfer at the film surface, resulting in the enhancement of photocatalytic activity.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► WO3 nanoparticles with 5–30 nm size are obtained by ball milling as catalyst precursors. ► KrF laser irradiation of the films enhances anomalous crystallite growth. ► Laser-induced photothermal and photochemical effects are the key factors for crystal growth. ► Very high photocatalytic dye degradation activity in the film prepared by KrF laser irradiation.

Keywords
WO3; Photocatalyst; Nanoparticles; Laser treatment; Water purification
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Visible light photocatalytic activity enhancement for water purification in Cu(II)-grafted WO3 thin films grown by photoreaction of nanoparticles
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 108–109, 11 October 2011, Pages 47–53
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