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Partager le résultat de cette recherche Interroger des sources externesComportements thermique et photochimique du paracétamol et de l’aspirine par la goethite en solution aqueuse en phase hétérogène / Yazid Mameri
Titre : Comportements thermique et photochimique du paracétamol et de l’aspirine par la goethite en solution aqueuse en phase hétérogène Type de document : texte imprimé Auteurs : Yazid Mameri, Auteur ; Nadra Debbache, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 177 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Paracétamol Aspirine Photodégradation Radicaux hydroxyle Goethite Fenton Paracetamol Aspirin Photodegradation Hydroxyl radicals الباراسيتامول الأسبرين التفكك الضوئي جذور الهيدروكسيل فانتون Index. décimale : 540 Chimie et sciences connexes Résumé : The photodegradation of two pharmaceuticals (PP), paracetamol (PC) and aspirin (ASP), induced by an iron (III) oxyhydroxide (Goethite) was studied in aqueous solution in heterogeneous phase. The phototransformation of the substrates was followed by spectrophotometry and HPLC in various mixtures namely: PP-Goethite, PP-Goethite-H2O2 and PP-Goethite-carboxylic acid. In absence of light both substrates showed different behavior with regard to Goethite in aqueous solution. Indeed, no interaction was observed in the case of the PC whereas a particular reaction was highlighted in the case of the ASP. Under irradiation, photodegradation of PP induced by Goethite shows slow kinetics and is dependent on several parameters such as pH, substrate concentration and catalyst. Fe (II) formed exclusively in the ASP-Goethite mixture shows the photocatalytic dissolution of Goethite. The mechanistic study reveals that hydroxyl radicals are not involved in the photocatalytic process of PC, however they govern on the photodegradation mechanism of ASP. The addition of hydrogen peroxide in the PP-Goethite mixture improves significantly the rate of disappearance of the substrates following a large production of ●OH radicals generated by a heterogeneous photo Fenton reaction. Different parameters have been studied, the effect of pH, as well as the concentration of H2O2.
The addition of carboxylic acid to the PP-Goethite system has also been studied and shows that oxalic acid has the most important photoactivity following the involvement of the eterogeneous like-Fenton process resulting from the photoreductive dissolution of the complex surface formed between Fe (III) of Goethite and oxalic acid. The following of the mineralization shows that the life of intermediates reaction is much greater than the starting product. In order to verify the feasibility of the photochemical process in the environment, the same systems were studied under solar irradiation. The results show that such systems operate with kinetics of the same order as those observed in artificial irradiations. These results provide some knowledge about the fate of PP in the aquatic environment as well as the photocatalytic treatment with oxy (hydroxides) of Fe (III). These results are very promising for the application of this system under pH conditions close to those met in the environment.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/MAM7351.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11001 Comportements thermique et photochimique du paracétamol et de l’aspirine par la goethite en solution aqueuse en phase hétérogène [texte imprimé] / Yazid Mameri, Auteur ; Nadra Debbache, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 177 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Paracétamol Aspirine Photodégradation Radicaux hydroxyle Goethite Fenton Paracetamol Aspirin Photodegradation Hydroxyl radicals الباراسيتامول الأسبرين التفكك الضوئي جذور الهيدروكسيل فانتون Index. décimale : 540 Chimie et sciences connexes Résumé : The photodegradation of two pharmaceuticals (PP), paracetamol (PC) and aspirin (ASP), induced by an iron (III) oxyhydroxide (Goethite) was studied in aqueous solution in heterogeneous phase. The phototransformation of the substrates was followed by spectrophotometry and HPLC in various mixtures namely: PP-Goethite, PP-Goethite-H2O2 and PP-Goethite-carboxylic acid. In absence of light both substrates showed different behavior with regard to Goethite in aqueous solution. Indeed, no interaction was observed in the case of the PC whereas a particular reaction was highlighted in the case of the ASP. Under irradiation, photodegradation of PP induced by Goethite shows slow kinetics and is dependent on several parameters such as pH, substrate concentration and catalyst. Fe (II) formed exclusively in the ASP-Goethite mixture shows the photocatalytic dissolution of Goethite. The mechanistic study reveals that hydroxyl radicals are not involved in the photocatalytic process of PC, however they govern on the photodegradation mechanism of ASP. The addition of hydrogen peroxide in the PP-Goethite mixture improves significantly the rate of disappearance of the substrates following a large production of ●OH radicals generated by a heterogeneous photo Fenton reaction. Different parameters have been studied, the effect of pH, as well as the concentration of H2O2.
The addition of carboxylic acid to the PP-Goethite system has also been studied and shows that oxalic acid has the most important photoactivity following the involvement of the eterogeneous like-Fenton process resulting from the photoreductive dissolution of the complex surface formed between Fe (III) of Goethite and oxalic acid. The following of the mineralization shows that the life of intermediates reaction is much greater than the starting product. In order to verify the feasibility of the photochemical process in the environment, the same systems were studied under solar irradiation. The results show that such systems operate with kinetics of the same order as those observed in artificial irradiations. These results provide some knowledge about the fate of PP in the aquatic environment as well as the photocatalytic treatment with oxy (hydroxides) of Fe (III). These results are very promising for the application of this system under pH conditions close to those met in the environment.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/MAM7351.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11001 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité MAM/7351 MAM/7351 Thèse Bibliothèque principale Thèses Disponible
Titre : Effet hépatoprotecteur d'extraits polyphénoliques de Cynara cardunculus,Genista quadriflora munby et Teucruim poluim geryii maire sur le dysfonctionnement mitochondrial induit par le paracétamol Type de document : texte imprimé Auteurs : Nacera Bensaou, Auteur ; Souad Ameddah, Directeur de thèse ; Chantal Wrutniak-Cabello, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 133 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
BiologieTags : cynara cardunculus gensista quadriflora Mundy Teucruim poluim geryii maire extraits polyphénoliques mitochondrie hépatique stress oxydatif paracétamol CYP2E1 Index. décimale : 570 Sciences de la vie. Biologie Diplôme : Doctorat en sciences En ligne : ../theses/biologie/BAA7083.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10518 Effet hépatoprotecteur d'extraits polyphénoliques de Cynara cardunculus,Genista quadriflora munby et Teucruim poluim geryii maire sur le dysfonctionnement mitochondrial induit par le paracétamol [texte imprimé] / Nacera Bensaou, Auteur ; Souad Ameddah, Directeur de thèse ; Chantal Wrutniak-Cabello, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2017 . - 133 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
BiologieTags : cynara cardunculus gensista quadriflora Mundy Teucruim poluim geryii maire extraits polyphénoliques mitochondrie hépatique stress oxydatif paracétamol CYP2E1 Index. décimale : 570 Sciences de la vie. Biologie Diplôme : Doctorat en sciences En ligne : ../theses/biologie/BAA7083.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10518 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BAA/7083 BAA/7083 Thèse Bibliothèque principale Thèses Disponible
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
ChimieTags : 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 : Permalink : 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
ChimieTags : 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 : Permalink : index.php?lvl=notice_display&id=11609 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/7775 BEN/7775 Thèse Bibliothèque principale Thèses Disponible
