E3S Web of Conferences
Volume 1, 2013Proceedings of the 16th International Conference on Heavy Metals in the Environment
|Number of page(s)||4|
|Section||Heavy Metals in Waste and Wastewater|
|Published online||23 April 2013|
Photo-reduction of Hexavalent Chromium in Aqueous Solution in the Presence of TiO2 as Semiconductor Catalyst
Laboratoire de Traitement des Eaux et Valorisation des Déchets Industriels, University Badji Mokhtar, Annaba, BP N°12, 23000 ALGERIA
The objective of this work is to determine the optimal conditions for the reduction of the hexavalent chromium in water using the photocatalytic system TiO2/ UV. The results show that the effectiveness of this system was significantly higher compared to direct photolysis. The influence of parameters such as photocatalyst loading and initial concentration of the substrate was studied. The study of the influence of pH shows that the reduction rates are grater for acid solutions. Furthermore the experimental results show that the presence of H2O2 at small concentration (10-6M) accelerates the reduction. However at higher concentration (10-4M) H2O2 inhibits the reduction. The presence of inorganic ions such as Cl- and SO42- does not seem to have any significant influence on the reduction rate of Cr (VI).
Key words: Hexavalent chromium / reduction / TiO2 / UV / pollution
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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