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The effect of acetic acid on the photocatalytic degradation of catechol and resorcinol

Paper ID Volume ID Publish Year Pages File Format Full-Text
44205 46007 2006 11 PDF Available
Title
The effect of acetic acid on the photocatalytic degradation of catechol and resorcinol
Abstract

The photocatalytic degradation of catechol and resorcinol with TiO2 in presence of acetic acid has been studied. Low concentrations of the acid (30–50 ppm) can modify the adsorption and degradation of the dihydroxybenzenes. However, the acetic acid concentration threshold at which effects are observed depends on the compound.FTIR analyses have shown that due to steric factors, catechol and resorcinol molecules adsorb on different TiO2 surface centres. Additionally, acetic acid molecules are able to displace Ti4+ coordinated water molecules and those interacting by hydrogen bonds, to a lesser extent. Consequently, the catalyst surface becomes restructured, favouring the adsorption of the dihydroxybenzenes. The acetates reaction with holes and oxygen molecules with photogenerated electrons to give O2− radicals which react with OH groups with acidic character to give new radicals that enhance catechol and resorcinol degradations.

Keywords
Photocatalysis; FTIR; Acetic acid–dihydroxybenzenes interaction; TiO2
First Page Preview
The effect of acetic acid on the photocatalytic degradation of catechol and resorcinol
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 299, 17 January 2006, Pages 274–284
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis