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Catalytic and photocatalytic performance of mesoporous CuxO–TiO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
27388 44018 2011 9 PDF Available
Title
Catalytic and photocatalytic performance of mesoporous CuxO–TiO2
Abstract

In this work the synthesis of mesoporous CuxO–TiO2 xerogels and their application in the catalytic and photocatalytic degradation of azo dye acid black 1 (AB1) are presented. To study the effect of Cu precursor, copper (II) formate, copper (II) chloride, and copper (II) nitrate were incorporated into the titanium alkoxide solution at various Cu/Ti atomic ratios. XRD, TEM, and N2-adsorption studies evidenced the crystallite size and textural properties dependency on Cu-precursor and Cu/Ti ratio. All catalysts were mesoporous and underwent pore enlargement with increasing Cu content. They showed first order kinetics for AB1 discoloration with the reaction rate constant k being in the range of 0.2–0.5 min−1 in catalytic degradation (dark experiments), slightly improving under diffuse illumination, and clearly increasing under UV light in catalysts obtained from inorganic precursors with large Cu content. Under dark conditions, degradation proceeds through a Fenton like mechanism, while under illumination it benefits from interfacial charge transfer from TiO2 to Cu (II). Both mechanisms require an intimate contact between Cu (II) and titania, which is favored in catalysts formed from inorganic Cu-precursors, in contrast to formate precursors that favored bulk CuO formation.

► Highly active mesoporous CuxO–TiO2 catalysts. ► Control of crystallite size and textural properties by means of the selection of Cu-precursor and Cu/Ti ratio. ► Copper chloride and nitrate superior than formate to improve the performance of Cu-doped catalysts. ► Fast degradation of AB1 dye under dark and diffuse light with mesoporous CuxO–TiO2.

Keywords
Mesoporous; Titanium oxide; Copper; AB1 dye
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Catalytic and photocatalytic performance of mesoporous CuxO–TiO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 222, Issue 1, 5 July 2011, Pages 249–257
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