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Effect of iron speciation on the photodegradation of Monuron in combined photocatalytic systems with immobilized or suspended TiO2 |
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| Authors: | Hana Měšťánková Gilles Mailhot Jaromír Jirkovský Josef Krýsa Michèle Bolte |
| Institution: | 1. Laboratoire de Photochimie Moléculaire et Macromoléculaire, Université Blaise Pascal, 63177, Aubière Cedex, France 2. J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolej?kova 3, 128 23, Prague 8, Czech Republic 4. Laboratoire de Photochimie Moléculaire et Macromoléculaire UMR CNRS-UBP 6505, Ensemble Universitaire des Cézeaux, 63177, Aubière Cedex, France 3. Department of Inorganic Technology, Institute of Chemical Technology, Technická 5, 166 26, Prague 6, Czech Republic |
| Abstract: | Photodegradation kinetics of Monuron (3-(4-chlorophenyl)-1,1-dimethylurea) in photoreactor with immobilized and suspended TiO2 photocatalyst were studied. The effect of addition of ferric or ferrous perchlorate was investigated. Whatever the concentration of Fe(III/II) added there is no significant negative effect on the photodegradation rate of pollutants. On the contrary, depending on speciation and concentration of iron salts, slight or marked acceleration of the photodegradation kinetics was observed. This positive influence was more pronounced in the case of TiO2 suspensions than for TiO2 layers. Fe(III) was generally more effective than Fe(II). |
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