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Improvement of visible light responsivity of rutile TiO2 nanorods by site-selective modification of iron(III) ion on newly exposed faces formed by chemical etching treatment

Paper ID Volume ID Publish Year Pages File Format Full-Text
45837 46423 2013 6 PDF Available
Title
Improvement of visible light responsivity of rutile TiO2 nanorods by site-selective modification of iron(III) ion on newly exposed faces formed by chemical etching treatment
Abstract

Site-selective modification of trivalent iron(III) (Fe3+) ions was applied to rutile titanium(IV) oxide (TiO2) nanorods after chemical etching treatment in order to improve photocatalytic activity under visible-light irradiation. Chemical etching of rutile nanorods with {1 1 0} and {1 1 1} faces using aqueous sulfuric acid (H2SO4) or hydrogen (H2O2)–ammonia (NH3) solution exposed {0 0 1} and {1 1 n} (n < 1) faces, respectively. Fe3+-modified rutile nanorods after chemical etching exhibited higher photocatalytic activity for degradation of toluene in gas phase than that before chemical etching. This improvement of photocatalytic activity was attributed to a large amount of site-selectively-modified Fe3+ ions, resulting in an increase in photoabsorption. Moreover, our results indicate that a rutile nanorod with large {0 0 1} and {1 1 0} exposed crystal faces is the most suitable structure for visible light response by site-selective modification of Fe3+ ions.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Fe3+ were modified on newly exposed {0 0 1} and {1 1 n} (n < 1) as oxidation faces. ► Photocatalytic activity was evaluated by decomposition of toluene under visible light. ► Fe3+-modified rutile nanorods after etching with H2SO4 exhibited superior activity. ► Fe3+-modification on {0 0 1} faces increased in electron injection from Fe3+ into TiO2. ► Activity depended on both surface area of reduction faces and amount of electrons.

Keywords
Rutile TiO2 nanorod; Exposed crystal faces; Site-selective modification of Fe3+ ions; Chemical etching; Visible-light responsive photocatalyst
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Improvement of visible light responsivity of rutile TiO2 nanorods by site-selective modification of iron(III) ion on newly exposed faces formed by chemical etching treatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 130–131, 7 February 2013, Pages 264–269
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