| Titre : |
Dégradation photocatalytique de polluant pharmaceutique en présence des acides organiques et des métaux de transitions en solution aqueuse. |
| Type de document : |
texte imprimé |
| Auteurs : |
Mohamed El Hadi Benssassi, Auteur ; Tahar Sehili, Directeur de thèse |
| Mention d'édition : |
04-juil-21 |
| Editeur : |
جامعة الإخوة منتوري قسنطينة |
| Année de publication : |
2021 |
| Importance : |
179 f. |
| Format : |
30 cm. |
| Note générale : |
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Chimie
|
| Tags : |
Chime: Chimie Analytique et Environnement Paracétamol Photodégradation FeIII-Aspartate FeIII-Glutamate FeIII-Lactate Radicaux hydroxyle Paracetamol Photodegradation hydroxyl radicals الباراسيتامول التحلل الضوئي الجذور الهيدروكسيلية FeIII-Asp FeIII-Glu FeIII-Lac |
| Index. décimale : |
540 Chimie et sciences connexes |
| Résumé : |
The objective of this work is to study the photochemical fate of paracetamol or acetaminophen (PC) as a model pharmaceutical pollutant, in the presence of three iron complexes (FeIII-Aspartate, FeIII-Glutamate, or FeIII-Lactate) under irradiation at 365 nm. First, the FeIII complexes were characterized by UV-visible spectrophotometry; the results confirmed that these complexes are stable in the dark and at room temperature. Under irradiation at 365 nm, the photolysis of these complexes is relatively rapid: about 71% of the FeIII-Aspartate complex (t1/2 = 10.5 min, pH = 3.0) decomposed after 1 hour of irradiation, and about 73% (t½ = 6.2 min, pH = 3.40), and 91% (t½ = 6.4 min, pH = 3.0) in the case of the FeIII-Glutamate and FeIII-Lactate complex, respectively. In addition, this photochemical transformation depends on the wavelength of irradiation and pH. Direct photolysis of paracetamol under UVA irradiation showed a negligible effect, while the presence of FeIIIcomplexes favors the photodegradation of PC, which is faster in the presence of the FeIII-Lactate complex. Photodegradation was studied using various parameters such as initial pH, complex concentration, oxygen, and paracetamol concentration. The addition of T-BuOH as a hydroxyl radical scavenger and anaerobic conditions inhibit the photodegradation of PC, indicating that the photodegradation of paracetamol in the presence of FeIII-Asp, FeIII-Glu, or FeIII-Lact complexes is limited by the formation of hydrogen peroxide, the source of HO●. Seven transformation by-products have been identified by HPLC-MS, mainly hydroxylated derivatives. Reaction pathways are identified, highlighting the role of long-lived photoformed radicals. This study highlights the important role that organic iron complexes can play on the fate of pharmaceutical pollutants in the environment aquatic.
|
| Diplôme : |
Doctorat |
| En ligne : |
../theses/chimie/BEN7775.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11609 |
Dégradation photocatalytique de polluant pharmaceutique en présence des acides organiques et des métaux de transitions en solution aqueuse. [texte imprimé] / Mohamed El Hadi Benssassi, Auteur ; Tahar Sehili, Directeur de thèse . - 04-juil-21 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 179 f. ; 30 cm. Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français ( fre)
| Catégories : |
Français - Anglais
Chimie
|
| Tags : |
Chime: Chimie Analytique et Environnement Paracétamol Photodégradation FeIII-Aspartate FeIII-Glutamate FeIII-Lactate Radicaux hydroxyle Paracetamol Photodegradation hydroxyl radicals الباراسيتامول التحلل الضوئي الجذور الهيدروكسيلية FeIII-Asp FeIII-Glu FeIII-Lac |
| Index. décimale : |
540 Chimie et sciences connexes |
| Résumé : |
The objective of this work is to study the photochemical fate of paracetamol or acetaminophen (PC) as a model pharmaceutical pollutant, in the presence of three iron complexes (FeIII-Aspartate, FeIII-Glutamate, or FeIII-Lactate) under irradiation at 365 nm. First, the FeIII complexes were characterized by UV-visible spectrophotometry; the results confirmed that these complexes are stable in the dark and at room temperature. Under irradiation at 365 nm, the photolysis of these complexes is relatively rapid: about 71% of the FeIII-Aspartate complex (t1/2 = 10.5 min, pH = 3.0) decomposed after 1 hour of irradiation, and about 73% (t½ = 6.2 min, pH = 3.40), and 91% (t½ = 6.4 min, pH = 3.0) in the case of the FeIII-Glutamate and FeIII-Lactate complex, respectively. In addition, this photochemical transformation depends on the wavelength of irradiation and pH. Direct photolysis of paracetamol under UVA irradiation showed a negligible effect, while the presence of FeIIIcomplexes favors the photodegradation of PC, which is faster in the presence of the FeIII-Lactate complex. Photodegradation was studied using various parameters such as initial pH, complex concentration, oxygen, and paracetamol concentration. The addition of T-BuOH as a hydroxyl radical scavenger and anaerobic conditions inhibit the photodegradation of PC, indicating that the photodegradation of paracetamol in the presence of FeIII-Asp, FeIII-Glu, or FeIII-Lact complexes is limited by the formation of hydrogen peroxide, the source of HO●. Seven transformation by-products have been identified by HPLC-MS, mainly hydroxylated derivatives. Reaction pathways are identified, highlighting the role of long-lived photoformed radicals. This study highlights the important role that organic iron complexes can play on the fate of pharmaceutical pollutants in the environment aquatic.
|
| Diplôme : |
Doctorat |
| En ligne : |
../theses/chimie/BEN7775.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=11609 |
|
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