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Photocatalytic degradation of p-cresol on Pt/γAl2O3–TiO2 mixed oxides: Effect of oxidizing and reducing pre-treatments

Paper ID Volume ID Publish Year Pages File Format Full-Text
27181 44007 2012 5 PDF Available
Title
Photocatalytic degradation of p-cresol on Pt/γAl2O3–TiO2 mixed oxides: Effect of oxidizing and reducing pre-treatments
Abstract

Pt/γAl2O3–TiO2 photocatalysts were prepared by wet impregnation and tested in the photodegradation of p-cresol. The γAl2O3–TiO2 (5, 10 and 20 wt% TiO2) mixed oxides were prepared by simultaneous hydrolysis of boehmite and titanium alkoxide. The solids were characterized by nitrogen adsorption (BET surface area), XRD, UV–vis, FTIR-CO spectroscopy and TOC determinations. The mixed oxides showed higher specific surface areas than those obtained with the TiO2 bare semiconductor. On the Pt/γAl2O3–TiO2 photocatalysts, it was observed that the anatase phase was stabilized and the Eg band was shifted to the blue region. In the p-cresol photodegradation the reduced-Pt/γAl2O3–TiO2 solids were more active than the calcined-Pt/γAl2O3–TiO2 photocatalysts. The formation of reduced Pt0 leads to a highest photoactivity for the p-cresol photodegradation by enhancing the electron–hole separation.

Graphical abstractEfficient p-cresol photodegradation on reduced Pt highly dispersed on Al2O3–TiO2 mixed oxidesFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The Al2O3–TiO2 showed higher specific surface area than Al2O3, TiO2 references. ► Pt is highly dispersed on Al2O3–TiO2 mixed oxides. ► Pt on reduced state supported on Al2O3–TiO2 is more active in photodegradation. ► On Pt reduced a high photoactivity is due to better photogenerated charge separation.

Keywords
p-Cresol photodegradation; Pt/TiO2; Pt/γAl2O3–TiO2; Thermal treatments effects; FTIR-CO; UV–vis; XRD
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Photocatalytic degradation of p-cresol on Pt/γAl2O3–TiO2 mixed oxides: Effect of oxidizing and reducing pre-treatments
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 236, 15 May 2012, Pages 21–25
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