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Shift of initial mechanism in TiO2-assisted photocatalytic process

Paper ID Volume ID Publish Year Pages File Format Full-Text
44619 46046 2006 6 PDF Available
Title
Shift of initial mechanism in TiO2-assisted photocatalytic process
Abstract

There are still open questions concerning the initial steps in photocatalytic mechanisms. In this paper, the effects of TiO2 surface modification on the shift of initial mechanism in UV light photodegradation of three model azo dyes, Orange I (OI), Orange II (OII), and Orange G (OG), are reported. Without modification, the direct hole mechanism plays a major role for all the three dyes; the relative percentage of hole mechanism (ph) is in the order of OI > OII > OG. However, with additives (F− or SO42−), which change the surface chemistry of the semiconductor, the initial steps shift partly from direct hole oxidation to radical induced mechanism; the reaction sites move from the particle surface to the solution. The shift potential is in the order of OI < OII < OG. Adsorption isotherm experiments show that there is no correlation between the adsorption ability of dyes and the photodegradation mechanism. The reaction mechanism is probably related to the dyes’ affinity with active species.

Keywords
Photocatalysis; Mechanism; Initial steps; Surface modification
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 301, Issue 2, 24 February 2006, Pages 152–157
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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