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An improvement of photocatalytic activity of TiO2 Degussa P25 powder

Paper ID Volume ID Publish Year Pages File Format Full-Text
39144 45808 2015 11 PDF Available
Title
An improvement of photocatalytic activity of TiO2 Degussa P25 powder
Abstract

•Surface of TiO2 Degussa P25 powder is modified by annealing in air and in vacuum.•Essential changes in surface composition were confirmed by XPS.•An adsorption measurement exhibits several structural features.•By annealing in vacuum the photocatalytic activity can be significantly increased.•Specific kinetic constant calculations permit to reveal efficiency of adsorption.

The photocatalytic activities of Degussa P25 powders annealed at various temperatures in vacuum and air were studied together with investigations of their compositions by XPS, of their crystal structures by XRD and of their specific surface areas by BET. It is shown that the photocatalytic activity of P25 powders was remarkably enhanced after vacuum annealing; the kinetic coefficient can be raised by 75% during annealing at 400 °C. It is obvious that this enhancement is not related to the adhesion ability of the P25 powders.

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Keywords
Nano-powder; Titanium dioxide; Photocatalysis; Water treatment
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An improvement of photocatalytic activity of TiO2 Degussa P25 powder
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 500, 5 July 2015, Pages 40–50
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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