American Journal of Innovative Research & Applied Sciences
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| ARTICLES | Am. J. innov. res. appl. sci. Volume 7, Issue 1, Pages 36-43 (July 2018)
American Journal of innovative
Research & Applied Sciences
ISSN 2429-5396 (Online)
OCLC Number: 920041286
| JULY VOLUME 7 | N° 1 | 2018 |
*Correspondant author and authors Copyright © 2018:
| El Mouraille Nadia 1| Belmouden Moustapha *1 | and | Ait Ichou Yahia 1|
1. Ibn Zohr university | Department of Chemistry | Agadir | Morocco |
This article is made freely available as part of this journal's Open Access: ID | Nadia-ManuscriptRef.2-ajira040718 |
Background: The use of pesticides massively in agriculture is considered among the causes of pollution most probable of surface and ground water. These organic compounds are very hazardous and harmful to health, as most are toxic and carcinogenic, even at low concentrations. For these reasons, in recent years, environmental regulations in many countries have become strict for the production of drinking water and wastewater treatment, in particular concerning pollution by pesticides. Objective: The removal of pesticides from contaminated water is an extremely complex problem due to the wide range of pesticides of multiple chemical structures and properties. Among the unconventional methods of treatment of polluted water, heterogeneous photocatalysis has been used for the treatment of several pollutants such as pesticides. The objective of this work is the evaluation of this method for the elimination of a pesticide under different operating conditions Methods: Photocatalytic degradation of aqueous commercial pesticide "Mythos" solution has been tested by using TiO2 as a photocatalyst and a new batch reactor using low voltage UV lamps as an irradiation source. The influence of some parameters such as the presence of UV irradiation, aeration, pH, pesticide concentration and time of reaction was examined. The effect of some inorganic anions, such as Cl-, SO42- and NO3-, commonly present in real effluents, on the photocatalytic degradation, was also studied. Results: The degradation rates were found to be strongly influenced by all the above parameters, except pH which has a moderate effect. It is found that the photocatalytic degradation process follows first-order reaction kinetics represented by the Langmuir-Hinshelwood mechanism. The presence of Cl- and SO42- anions led to a slight decrease of the effectiveness of the photocatalytic degradation. However, the observed inhibitive effect on the degradation of the tested fungicide is shown to follow the order: Cl-< SO42- < CO32-< PO42-< NO3-. The aeration of the medium bulk enhanced the photodegradation rate of the pollutant. Conclusion: based on the results, the photocatalytic degradation using a low-voltage UV light could be a useful method for the removal, of wastewaters containing Mythos.
Keywords: Photocatalysis, TiO2, low-voltage UV, Mythos, kinetic model.
UV/TiO2 PHOTOCATALYTIC OXIDATION OF COMMERCIAL PESTICIDE IN AQUEOUS SOLUTION
| El Mouraille Nadia 1 | Belmouden Moustapha *1 | and | Ait Ichou Yahia 1 |. Am. J. innov. res. appl. sci. 2018; 7(1):36-43.
| PDF FULL TEXT | XML FILE | HTML FILE | Received | 01 July 2018 | | Published | 26 July 2018 |