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FeOOH catalytic ozonation of oxalic acid and the effect of phosphate binding on its catalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
47450 46472 2010 7 PDF Available
Title
FeOOH catalytic ozonation of oxalic acid and the effect of phosphate binding on its catalytic activity
Abstract

The catalytic activity of FeOOH on ozonation of oxalic acid at pH 4.0 and 7.0 conditions was investigated in a semi-continuous experimental mode. The results indicate that FeOOH can effectively promote the generation of hydroxyl radicals (OH) under acidic and neutral pH conditions, resulting in the enhancement of the degradation efficiency of oxalic acid by ozone. It is deduced that the hydroxyl groups both of in neutral state (Me-OH) and positive charge state (Me-OH2+) can perform as the active sites for ozone decomposition into hydroxyl radicals generation. The ligand exchange of hydroxyl groups by phosphate adsorption deteriorates the catalytic activity of FeOOH on ozonation, but the phosphate is found to desorb from FeOOH during the catalytic ozonation process, resulting in the reactivation of the catalytic activity of FeOOH.

Keywords
Catalytic ozonation; FeOOH; Hydroxyl groups; Oxalic acid; Phosphate
First Page Preview
FeOOH catalytic ozonation of oxalic acid and the effect of phosphate binding on its catalytic activity
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 96, Issues 1–2, 26 April 2010, Pages 94–100
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis