L'élimination du diuron dans l'eau à partir des ressources naturelles de la Côte d'Ivoire : photocatalyse solaire et adsorbants carbones à base de coques de noix de coco

Abstract : Our researches were about the elimination of diuron in aqueous solution. It is concerned the degradation exclusively by the TiO2 under artificial and solar irradiation, either by adsorption on the activated carbon prepared from coconut shells.The influence of the catalyst concentration, pollutant mass and inorganic ions in solution (as well nitrate, ammonium and sulphate) has been studied. We brought to the fore that the disappearance of diuron followed the model of Langmuir-Hinshelwood like many other pollutants. The presence of ions has little influence on the photocatalytic activity of catalyst. The use of catalyst and especially re-use supported catalyst on cellulose materials under solar irradiation without loss of photocatalytic activity made it possible to show that the process is applicable industrially.With the aim of develop the natural resources of the ivory Coast some activated carbons have been prepared from coconut shells according two methods of activation. These materials developed a good porosity of meso and micro porosity. Specific surfaces are comprised between 200 and 1300 m2.g-1. These surfaces are important and tests of Boehm showed that all these carbons contain many surface functions. These functions are mainly lactone and carboxylic acid. The kinetic studies of the diuron revealed that these carbons showed a good affinity with pollutant. However the activated carbons have a better diffusion physically in relation to those gotten by the chemical method. We showed that these two techniques of water treatment are especially the best methods peasants in way of the Third World countries
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Drissa Bamba. L'élimination du diuron dans l'eau à partir des ressources naturelles de la Côte d'Ivoire : photocatalyse solaire et adsorbants carbones à base de coques de noix de coco. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ048S⟩. ⟨tel-01752683⟩

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