Treatment of Pesticides in Wastewater by Heterogeneous and Homogeneous Photocatalysis

The effect of different heterogeneous and homogeneous photocatalytic systems on the oxidative degradation of mepiquat chloride in aqueous solutions was investigated. In the case of heterogeneous reactions, the influence of five factors was studied: the type of catalyst, photocatalyst concentration,...

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Published inInternational Journal of Photoenergy Vol. 2012; no. 2012; pp. 265 - 270-030
Main Authors Poulios, Ioannis, Cretescu, Igor, Coromelci-Pastravanu, Cristina, Drăgan, Maria, Stan, Catalina Daniela
Format Journal Article
LanguageEnglish
Published Cairo, Egypt Hindawi Limiteds 01.01.2012
Hindawi Puplishing Corporation
Hindawi Publishing Corporation
John Wiley & Sons, Inc
Hindawi Limited
Subjects
Aqueous solutions
Catalysts
Chemical properties
Chlorides
Control
Degradation
Environmental aspects
Environmental chemistry
Identification and classification
Pesticides
Photocatalysis
Purification
Sewage
Titanium dioxide
Waste water
Romania
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Summary:The effect of different heterogeneous and homogeneous photocatalytic systems on the oxidative degradation of mepiquat chloride in aqueous solutions was investigated. In the case of heterogeneous reactions, the influence of five factors was studied: the type of catalyst, photocatalyst concentration, pH, pesticide concentration, and the presence of H2O2 and/or Fe3+. For homogeneous catalysis, other factors were studied: the oxidising agent and the light source. Nearly complete degradation of mepiquat chloride was obtained after about 180 minutes in the presence of an acid medium (pH3) using a UV-A lamp and TiO2P-25 catalyst (0.5 g/L), for an initial pesticide concentration of 10 ppm. Degradation rates corresponding to homogeneous photocatalysis were lower compared to those corresponding to the use of TiO2 as the photocatalyst.
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ISSN:1110-662X
1687-529X
DOI:10.1155/2012/194823