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The influence of Fe(III) speciation on supported TiO2 efficiency: example of monuron photocatalytic degradation |
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| Authors: | H M &#x;t&#x;nkov J Krýsa J Jirkovský G Mailhot M Bolte |
| Affiliation: | a Department of Inorganic Technology, Institute of Chemical Technology, Technická 5, CZ-166 28, Prague 6, Czech Republic b Jaroslav Heyrovský Institute of Physical Chemistry, Academy of Sciences, Dolejškova 3, CZ-182 23, Prague 8, Czech Republic c Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR CNRS 6505,Université Blaise Pascal de Clermont-Ferrand, F-63177, Aubière Cedex, France |
| Abstract: | The degradation of herbicide monuron (initial concentration 5×10−5 M) in plate photoreactor with laminar flow of the solution using heterogeneous (TiO2) and/or homogeneous photocatalyst (Fe(ClO4)3) was investigated. For the rate of photoinduced degradation with Fe(III) aquacomplexes, the initial concentration of monomer Fe(OH)2+, which is the most photocatalytically active form of Fe(III), is crucial. The degradation rate for combination of both photocatalysts is higher than the sum of the rates for separately taken single catalysts. This is caused not only by the addition of the two effects but also by the fact that Fe(III) acts as scavanger of electrons photogenerated in TiO2 particles thus let down hole–electron recombination. Fe(OH)2+ appears to be the most photoactive trap for electrons. |
| Keywords: | Supported TiO2 Iron Fe(OH)2+ Monuron Photodegradation |
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