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Highly photocatalytic activity of metallic hydroxide/titanium dioxide nanoparticles prepared via a modified wet precipitation process

Paper ID Volume ID Publish Year Pages File Format Full-Text
27496 44026 2008 6 PDF Available
Title
Highly photocatalytic activity of metallic hydroxide/titanium dioxide nanoparticles prepared via a modified wet precipitation process
Abstract

Surface modification is one important approach to increase the photocatalytic activity of TiO2. By using a modified wet precipitation process, novel M(OH)x/TiO2 nanoparticles were synthesized, where M(OH)x represents ferric or cupric hydroxide. The prepared M(OH)x/TiO2 powders were characterized with XRD, FT-IR, BET, UV–vis DRS, and TGA, and were observed to yield high photocatalytic ability by using methyl orange (MO) as a model compound of organic pollutants to be degraded. Due to the accelerating effects of the new photocatalyst, the half-time of MO during its photocatalytic degradation at pH 6.0 over M(OH)x/TiO2 was decreased from 332 min for unmodified neat TiO2 to 63 min for Fe(OH)3/TiO2 and 65 min for Cu(OH)2/TiO2, respectively. The enhancing effects of M(OH)x/TiO2 was further observed in a wide composition range with various M/Ti atomic ratios in the photocatalysts and in a wide pH range of the MO solution from 3 to 7. This enhancing effect is mainly attributed to the increased trapping of the photogenerated electron by the higher valence sites (Fe(III) or Cu(II)) in the hydroxide layer near the M(OH)x/TiO2 interface and the enriched surface hydroxyl groups which accept photogenerated holes to yield more hydroxyl radicals.

Keywords
Titanium dioxide; Surface modification; Ferric hydroxide; Cupric hydroxide; Photocatalysis
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Highly photocatalytic activity of metallic hydroxide/titanium dioxide nanoparticles prepared via a modified wet precipitation process
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 198, Issues 2–3, 15 August 2008, Pages 282–287
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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