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| Titre : | Comparative study of the photocatalytic degradation of pesticides using different types of catalysts |
| Auteurs : | Mr Y. AIMER, Directeur de thèse ; Assala NASRI, Auteur |
| Type de document : | texte imprimé |
| Editeur : | Algèrie:unv saida-Dr Moulay Tahar, 2020/2021 |
| ISBN/ISSN/EAN : | tect06415 |
| Format : | 94 P / 27 CM |
| Note générale : |
CHAPTER I:WATER POLLUTION BY PESTICIDES AND WASTEWATER TREATMENT
CHAPTER II:ADVANCED OXIDATION PROCESSES (AOPS) AND PHOTOCATALYSIS CHAPETR III: EXPERIMENTAL DEVICES CHAPTER IV: RESULTS AND DISCUSSION |
| Langues: | Français |
| Catégories : | |
| Résumé : |
This work was carried out in the laboratory of the Department of Process Engineering at
the University of Saida. Its first part was devoted to the bibliographical study of treatment methods specific to pollutants that are difficult to degrade such as pesticides, in the second, the photocatalysis of THB with DIM in an aqueous medium was studied using a photoreactor and two catalysts in mass form under different conditions and in the end, we noticed the following points: - For ZnO, the concentration effect of the catalyst revealed that [ZnO] = 5g/L is the most efficient with a THB elimination rate of more than 60% and almost 70% mineralization (IP), as to the nature of the medium, neutral pH is by far the best condition for eliminating the pesticide. - The addition of another pesticide which is the DIM to have the cocktail effect or the real effluent influenced the operating conditions and forced us to double the quantity of the catalyst ([ZnO] = 10g/L) have a better yield of almost 60% but with less time than when the THB is alone which leads us to deduce that the presence of DIM has positively influenced the degradation reaction rate of the THB in the mixture. - The comparison of the reduction in the permanganate index shows us that it reaches more than 40% for the mixture after 2 hours of photocatalysis against 31% for THB alone, this can be explained by the accumulation of intermediate products in the mixture. - The reuse of the catalyst has shown us that the more the ZnO is reused, the more its catalytic efficiency decreases, after 1h30, ZnO (50%), ZnO x1 (35%), ZnO x2 (30%) and ZnO x3 (28%) which is normal because its structure is influenced by the catalytic act and the number of its active sites decreases. - For TiO 2 , the degradation of THB has reached its best level of more than 30% for 200 mg/L, the catalytic efficiency is low compared to the literature but we remind that we are working with the mass form which takes us to using it in its supported form in the perspectives of this work. |
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 Comparative study of the photocatalytic degradation of pesticides using different types of catalysts Adobe Acrobat PDF |
