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International Journal of Photoenergy
Volume 5 (2003), Issue 2, Pages 69-74

Photocatalytic mineralization of humic acids with TiO2: Effect of pH, sulfate and chloride anions

1Environmental Biotechnology Department, Silesian University of Technology, Akademika 2, Gliwice 44-100, Poland
2Laboratoire de Chimie et Applications (EA 3471), Universite de Metz, rue Victor Demange, Saint-Avold 57500, France

Copyright © 2003 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Aims of the present work are to investigate the photomineralization of commercial humic acid in water solution.The effect of initial pH of solution and different anions (chloride, sulfate and mixture) on the photocatalytic degradation of HA with titanium dioxide in aqueous solution has been examined. The photocatalytic mineralization rate in alkaline solution is lower than in neutral and acidic solution. In our conditions no effect of chloride ions on the degradation rate is observed. The influence of the sulfate depends on its concentration in the solution. For a large concentration, we note a decrease of the mineralization rate.