Traitement des eaux par action combinée de la photocatalyse solaire et de l'adsorption sur charbon actif : conception et réalisation du procédé

Abstract : Our studies have focused on the development of a simple photoreactor hand-made from polymer wastes and recover the coconut shell waste tuning them into activated carbon for the treatment of wastewater. The first part of our study, the photoreactor allowed for the photodegradation of Diuron (abundant in herbicides used in agriculture), under artificial (UV lamp) and natural (sunlight) irradiation. The tests were conducted on two commercial supported catalysts (the Quartzel for Saint-Gobain Quartz and cellulosic support for Ahlstrom). The photodegradation of Diuron kinetics follows a pseudo-first order. The cellulosic support is suitable of our photoreactor even if the Quartzel is more efficient than the cellulosic support. The photodégradation under both two irradiation sources is the same. In order to recover the waste agricultural on Côte d'Ivoire (mainly final waste coconut shell), active carbons were prepared from them by physical activation. We have developed a method that takes into account the cost factor and product performance. Tests of physical and chemical characterizations were performed. Our coal "optimized" has a specific surface of 750 m² per gram about is essentially microporous and contains features acids and bases on its surface. Kinetic studies of adsorption of Diuron showed that the optimized coal has a good affinity with the probe molecule. We have in the last part of our study combined the two processes (photocatalysis followed by adsorption on activated carbon). Preliminary studies on the photo-reactors were carried out. These tests have allowed us to establish the experimental protocol used, which was to make the photodegradation for 90 minutes and then pass the solution through a cartridge of activated carbon prepared by ourselves. A comparative study of three methods was performed and we observed the benefits of coupling TiO2/CA. We could eliminate 10 % of Diuron, and by-products of photodegradation of Diuron remained on the solution. Also technically we can do the process by the day by Photocatalysis and by night by adsorption
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Grah Patrick Atheba. Traitement des eaux par action combinée de la photocatalyse solaire et de l'adsorption sur charbon actif : conception et réalisation du procédé. Autre. Université Paul Verlaine - Metz, 2009. Français. ⟨NNT : 2009METZ032S⟩. ⟨tel-01752657⟩

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