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Experimental and theoretical studies of Fe-doped TiO2 films prepared by peroxo sol–gel method

Paper ID Volume ID Publish Year Pages File Format Full-Text
41564 45893 2011 8 PDF Available
Title
Experimental and theoretical studies of Fe-doped TiO2 films prepared by peroxo sol–gel method
Abstract

Transparent, uniform, crack-free and visible light activated Fe-doped TiO2 thin films have been prepared by an organic-free approach using titanium tetrachloride (TiCl4), Fe3+ and ammonium hydroxide solutions to form yellow aqueous peroxo titanic acid (PTA) solution. Pure glass was made superhydrophilic after heating at 550 °C for 1 h and was used as the coating substrate. The PTA solution dispersed uniformly on the superhydrophilic glass by forming a thin film, resulting in a crack-free Fe-doped TiO2 film as observed under FESEM. XRD results confirmed the presence of only anatase phase for all samples after calcination at 550 °C. The Fe-doped TiO2 films exhibited slight red-shift in absorbance and enhanced absorbance in the visible-light region compared with undoped TiO2, attributed to bandgap narrowing by successful Fe3+ doping into TiO2, which is supported by DOS calculations. Photodegradation of stearic acid (SA) revealed that Fe3+ doping increased visible light photocatalytic activity four-fold compared to undoped TiO2 at optimal Fe-doped TiO2 (1 wt% Fe3+) film. At higher Fe ions concentrations, the existence of increased charge recombination sites and segregated iron oxide phase suppressed the photoactivity.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (114 K)Download as PowerPoint slideHighlights► The current work describes an easy and “organic” free approach to synthesize cation Fe-doped TiO2 films. ► The Fe-doped TiO2 thin films are transparent, uniform, crack-free and visible-light active. ► Density of States (DOS) calculations reveal that band gap narrowing of Fe-doped TiO2 results in enhanced visible light photocatalytic activity.

Keywords
Peroxo titanic acid (PTA); Visible light; Fe-doped TiO2; Density functional theory (DFT)
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Experimental and theoretical studies of Fe-doped TiO2 films prepared by peroxo sol–gel method
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 401, Issues 1–2, 15 July 2011, Pages 98–105
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