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Photocatalytic degradation of TCE in dry and wet air conditions with TiO2 porous thin films

Paper ID Volume ID Publish Year Pages File Format Full-Text
46762 46448 2011 8 PDF Available
Title
Photocatalytic degradation of TCE in dry and wet air conditions with TiO2 porous thin films
Abstract

Porous TiO2-anatase thin films were prepared by the sol–gel route and used for the study of the influence of structural properties in their photocatalytic activity. Sols were prepared by using titanium isopropoxide with two types of modifier ligands, namely acetic acid and acetyl acetone, and pore generating agents such as polyethylene glycol, pluronic F-127 and polyethylene glycol hexadecyl ether (Brij 58). The photocatalytic activity for the degradation of trichloroethylene in air was evaluated under ultraviolet irradiation at different gas flows and water vapour contents. The photocatalytic activity depends on the nature of the pore generating agent which influences the TiO2 crystallite size and the textural properties of the final material. The samples obtained by using acetic acid as the modifier ligand and either Brij 58 or PEG as the pore generating agent exhibited the best photocatalytic behaviour even in the presence of high quantities of water vapour. The direct trichloroethylene oxidation pathway to CO2 is favoured at low water vapour contents, but an important generation of COCl2 is observed even at low water partial pressures.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Photocatalytic performance on TiO2 thin films for TCE abatement. ► Increase of the photocatalytic activity by effect of the pore generating agent. ► Influence of the relative humidity on the mineralization. ► Formation of COCl2 even at low water partial pressure.

Keywords
Photocatalysis; Trichloroethylene degradation; Gas phase; Phosgene; COCl2; Relative humidity; TiO2 thin films; Sol–gel; Pore generating agent; PEG; Brij 58; F-127; Porosity; Spectral ellipsometry; Environmental ellipsometric porosimetry (EEP)
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Photocatalytic degradation of TCE in dry and wet air conditions with TiO2 porous thin films
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 108–109, 11 October 2011, Pages 14–21
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