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Degradation of 2,4-dichlorophenoxyacetic acid by photolysis and photo-Fenton oxidation

Cruz González, Germán and Julcour-Lebigue, Carine and Chaumat, Hélène and Jáuregui-Haza, Ulises and Delmas, Henri Degradation of 2,4-dichlorophenoxyacetic acid by photolysis and photo-Fenton oxidation. (2018) Journal of Environmental Chemical Engineering, 6 (1). 874-882. ISSN 2213-3437

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Official URL: https://doi.org/10.1016/j.jece.2017.12.049

Abstract

This work aimed at comparing different UV and H2O2 based advanced oxidation processes (AOPs) −photolysis, UV/H2O2, and photo-Fenton reaction- for the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D), a common ingredient of phytosanitary products. The influence of oxidant dose (H2O2), catalyst type and concentration, pollutant concentration, water matrix and irradiation spectrum was also analyzed. Under reference conditions (25 mg/L of 2,4-D in osmosed water), photo-Fenton oxidation using Fe2+ salt, initial pH value of 2.6 and a low pressure mercury vapor lamp (10 W, λ=254 nm) yielded more than 85% of pollutant mineralization in one hour, as compared to 60% and less than 10% for UV/H2O2 and photolysis, respectively. Such a performance could be achieved in 10 min only when applying optimal concentration range for Fenton’s reagent (2 to 5 times the stoichiometric amount of H2O2 and oxidant-to-catalyst molar ratio from 25 to 40). Conversely, addition of a ZSM-5 zeolite bearing iron active sites albeit catalyzing Fenton oxidation at natural pH – did not bring additional benefit to UV/H2O2 process. Use of wastewater treatment plant effluent as aqueous matrix or irradiation in the UVA-visible range somewhat lowered the fficiency of the homogeneous photo-Fenton process. Nonetheless, bench scale experiments under sunlight gave promising results for 2,4 D remediation in wastewater, leading to over 80% conversion of the pollutant within ten minutes.

Item Type:Article
HAL Id:hal-01879971
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universidad de La Habana - UH (CUBA)
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Deposited By: Carine JULCOUR LEBIGUE
Deposited On:24 Sep 2018 11:53

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