Résultat de la recherche
10 recherche sur le tag
'Fenton' 
Affiner la recherche Générer le flux rss de la recherche
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 : Contribution à l’étude de la dégradation photochimique de polluants organiques par les oxyhydroxydes de Fe (III) en solution aqueuse en phase hétérogène. Type de document : texte imprimé Auteurs : Sara Belattar, Auteur ; Nadra Debbache, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 161 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Photodégradation La GOE Dérivés phénoliques Radicaux hydroxyle Fenton Photodegradation GOE Phenolic derivatives Hydroxyl radicals التحلل الضوئي GOمشتقات الفینول ، جذور الھیدروكسیل فنتون Index. décimale : 540 Chimie et sciences connexes Résumé : The effectiveness of Goethite (GOE) in inducing the photodegradation of organic pollutants under artificial and solar irradiation in a heterogeneous medium and in aqueous solution was the main objective of this study. We used four organic pollutants of the phenol family (RP, BBP, BCP, phenol) whose chemical structure differs depending on the substitute nature. In the absence of light and in our experimental conditions, two distinct behaviors were observed as a function of the pollutants studied during the mixing of the GOE-substrate. Indeed, in the Phenol-GOE mixture, no interaction was observed whereas a slow reaction, in the presence of the GOE, was demonstrated with RP, BBP and BCP. This interaction can be attributed to a low adsorption of the substrate on the GOE in the following order: BCP (15%)> BBP (12%)> RP (5%)> Phenol (1%), and this phenomenon is optimal in acidic medium. The addition of H2O2 accelerates the thermal process in RP-GOE system while an inhibitory effect was observed for the other two substrates (BBP, BCP) in the presence of GOE. The presence of carboxylic acids in the substrate-GOE system has shown that oxalic acid has a positive effect on the kinetics of BCP and RP eliminations under our experimental conditions. Under irradiation at 365 nm, the photodegradation of these pollutants by the GOE, was characterized by slow kinetics and seems to be dependent on several parameters such as the pH, the concentration of the substrate, the catalyst concentration, the oxygen and the molecular structure of the substrates. The mechanistic study reveals that the radicals HO • do not intervene in the mechanism of degradation of the phenol on the other hand they govern the reaction in the case of RP, BBP and BCP. The addition of H2O2 in a GOE suspension significantly improves the rate of photodegradation due to additional production of HO• radicals generated by the Fenton photo process. Different parameters have been studied to optimize this process. In the same way, the efficiency of the photochemical process is improved by the presence of carboxylic acid in a GOE suspension following the involvement of the heterogeneous like-Fenton process resulting from the reductive photo dissolution of the surface complex formed between the Fe (III) Goethite and oxalic acid. 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 irradiation, which can reduce the energy costs of the photochemical process.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BEL7350.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11000 Contribution à l’étude de la dégradation photochimique de polluants organiques par les oxyhydroxydes de Fe (III) en solution aqueuse en phase hétérogène. [texte imprimé] / Sara Belattar, Auteur ; Nadra Debbache, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 161 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Photodégradation La GOE Dérivés phénoliques Radicaux hydroxyle Fenton Photodegradation GOE Phenolic derivatives Hydroxyl radicals التحلل الضوئي GOمشتقات الفینول ، جذور الھیدروكسیل فنتون Index. décimale : 540 Chimie et sciences connexes Résumé : The effectiveness of Goethite (GOE) in inducing the photodegradation of organic pollutants under artificial and solar irradiation in a heterogeneous medium and in aqueous solution was the main objective of this study. We used four organic pollutants of the phenol family (RP, BBP, BCP, phenol) whose chemical structure differs depending on the substitute nature. In the absence of light and in our experimental conditions, two distinct behaviors were observed as a function of the pollutants studied during the mixing of the GOE-substrate. Indeed, in the Phenol-GOE mixture, no interaction was observed whereas a slow reaction, in the presence of the GOE, was demonstrated with RP, BBP and BCP. This interaction can be attributed to a low adsorption of the substrate on the GOE in the following order: BCP (15%)> BBP (12%)> RP (5%)> Phenol (1%), and this phenomenon is optimal in acidic medium. The addition of H2O2 accelerates the thermal process in RP-GOE system while an inhibitory effect was observed for the other two substrates (BBP, BCP) in the presence of GOE. The presence of carboxylic acids in the substrate-GOE system has shown that oxalic acid has a positive effect on the kinetics of BCP and RP eliminations under our experimental conditions. Under irradiation at 365 nm, the photodegradation of these pollutants by the GOE, was characterized by slow kinetics and seems to be dependent on several parameters such as the pH, the concentration of the substrate, the catalyst concentration, the oxygen and the molecular structure of the substrates. The mechanistic study reveals that the radicals HO • do not intervene in the mechanism of degradation of the phenol on the other hand they govern the reaction in the case of RP, BBP and BCP. The addition of H2O2 in a GOE suspension significantly improves the rate of photodegradation due to additional production of HO• radicals generated by the Fenton photo process. Different parameters have been studied to optimize this process. In the same way, the efficiency of the photochemical process is improved by the presence of carboxylic acid in a GOE suspension following the involvement of the heterogeneous like-Fenton process resulting from the reductive photo dissolution of the surface complex formed between the Fe (III) Goethite and oxalic acid. 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 irradiation, which can reduce the energy costs of the photochemical process.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BEL7350.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11000 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/7350 BEL/7350 Thèse Bibliothèque principale Thèses Disponible
Titre : Degradation des dimethylphenols (XYLENOLS) par des chromophores photoinducteurs en solution aqueuse Type de document : texte imprimé Auteurs : Sihem Belaidi, Auteur ; T. Sehili, Directeur de thèse Editeur : Constantine : Université Mentouri Constantine Année de publication : 2015 Importance : 194 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie analytique physique et environnement Fenton photo-Fenton oxyde de fer naturel complexes Fe(III) – oxalate acide
oxalique DCO irradiation solaire natural iron oxide oxalic acid complex Fe (III) - oxalate COD sunlight فانتون فانتون الضوئي أكسید الحدید الطبیعي حمض الأكسالیك معقد (الحدید
(III) – الأكسالات) DCO الإشعاع الشمسيIndex. décimale : 540 Chimie et sciences connexes Résumé : In this study we have used dimethylphenols (xylenol) as models pollutants to show the effectiveness of the natural hematite (Fe2O3 natural) on the photocatalytic processes in heterogeneous environment.
The degradation of 3,5-dimethylphenol by Fenton and photo-Fenton processes was investigated, starting with the study of its photolysis at 254 nm and by H2O2/UV process.
Different physico-chemical parameters (concentrations of H2O2, Fe2+ and the pH) were tested in order to optimize the efficiency of Fenton process for degradation of 3,5-DMP. A Comparison of the performance of mineralization by different processes studied (Fenton and photo-Fenton) has shown that 70% and 80% of DOC removal was obtained after only 4 hours of photo-Fenton process at 365 nm and 254 nm respectively.
In the field of heterogeneous photocatalysis, a naturally occurring mineral was used. It was characterized by XRD, BET, IR and SEM. The XRD analysis showed the presence of 9 characteristic peaks attributed to hematite. Its photocatalytic efficiency was tested by the oxidation of 2,6-dimethylphenol (2,6-DMP). Photocatalysts based on iron (Fe2O3) have photocatalytic efficiency in the visible region. The results showed good efficiency under solar irradiation for the degradation of 2,6-DMP. Experiments carried at 365 nm required activation of the iron oxide with carboxylic acids. oxalic acid was the most effective carboxylic acid in terms of dissolution of natural iron oxide, and degradation of 2,6-DMP. Fe (III) - oxalate complex produce Fe2+ species by the photo-reduction of Fe3+ species and also lead to the
formation of hydrogen peroxide which reacts with Fe2+ to give •OH (Fenton reaction). We have optimized the experimental parameters affecting the degradation rate (oxalic acid concentration, pH, O2, temperature, inorganic ions ...) and propose a mechanism of degradation. The abatement rate of COD was 85% obtained for a treatment time of 14 hours in natural iron oxide - oxalate system under irradiation at 365 nm, demonstrating the ability of this technique to clean up effluents loaded with organic matter. The coupling of the system with the solar light has increased the rate of degradation of 2,6-DMP to 92% after 5 hours.
The use of natural iron oxide alone or in the presence of oxalic acid seems to be favored under solar irradiation which can reduce energy costs, especially in a country like Algeria.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BEL6735.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9888 Degradation des dimethylphenols (XYLENOLS) par des chromophores photoinducteurs en solution aqueuse [texte imprimé] / Sihem Belaidi, Auteur ; T. Sehili, Directeur de thèse . - Constantine : Université Mentouri Constantine, 2015 . - 194 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie analytique physique et environnement Fenton photo-Fenton oxyde de fer naturel complexes Fe(III) – oxalate acide
oxalique DCO irradiation solaire natural iron oxide oxalic acid complex Fe (III) - oxalate COD sunlight فانتون فانتون الضوئي أكسید الحدید الطبیعي حمض الأكسالیك معقد (الحدید
(III) – الأكسالات) DCO الإشعاع الشمسيIndex. décimale : 540 Chimie et sciences connexes Résumé : In this study we have used dimethylphenols (xylenol) as models pollutants to show the effectiveness of the natural hematite (Fe2O3 natural) on the photocatalytic processes in heterogeneous environment.
The degradation of 3,5-dimethylphenol by Fenton and photo-Fenton processes was investigated, starting with the study of its photolysis at 254 nm and by H2O2/UV process.
Different physico-chemical parameters (concentrations of H2O2, Fe2+ and the pH) were tested in order to optimize the efficiency of Fenton process for degradation of 3,5-DMP. A Comparison of the performance of mineralization by different processes studied (Fenton and photo-Fenton) has shown that 70% and 80% of DOC removal was obtained after only 4 hours of photo-Fenton process at 365 nm and 254 nm respectively.
In the field of heterogeneous photocatalysis, a naturally occurring mineral was used. It was characterized by XRD, BET, IR and SEM. The XRD analysis showed the presence of 9 characteristic peaks attributed to hematite. Its photocatalytic efficiency was tested by the oxidation of 2,6-dimethylphenol (2,6-DMP). Photocatalysts based on iron (Fe2O3) have photocatalytic efficiency in the visible region. The results showed good efficiency under solar irradiation for the degradation of 2,6-DMP. Experiments carried at 365 nm required activation of the iron oxide with carboxylic acids. oxalic acid was the most effective carboxylic acid in terms of dissolution of natural iron oxide, and degradation of 2,6-DMP. Fe (III) - oxalate complex produce Fe2+ species by the photo-reduction of Fe3+ species and also lead to the
formation of hydrogen peroxide which reacts with Fe2+ to give •OH (Fenton reaction). We have optimized the experimental parameters affecting the degradation rate (oxalic acid concentration, pH, O2, temperature, inorganic ions ...) and propose a mechanism of degradation. The abatement rate of COD was 85% obtained for a treatment time of 14 hours in natural iron oxide - oxalate system under irradiation at 365 nm, demonstrating the ability of this technique to clean up effluents loaded with organic matter. The coupling of the system with the solar light has increased the rate of degradation of 2,6-DMP to 92% after 5 hours.
The use of natural iron oxide alone or in the presence of oxalic acid seems to be favored under solar irradiation which can reduce energy costs, especially in a country like Algeria.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BEL6735.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9888 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/6735 BEL/6735 Thèse Bibliothèque principale Thèses Disponible
Titre : Elimination d’un colorant industriel par des méthodes physico-chimiques cas du Noir Acide 210. Type de document : texte imprimé Auteurs : Amina Talhi, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse Mention d'édition : 07-mars-21 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 185 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie: Chimie Analytique et Environnement Noir Acide 210 calcite bentonite Amberlite IRA400 adsorption échange d’ions oxydation avancée Fenton ultrasons traitement des eaux de tannage Acid Black 210 ion exchange advanced oxidation ultrasound tanning water treatment ملون اسود حمض 012الادمصاص التبادل الايوني طين البنتونيت الكالسيت آمبرليت IRA400الاكسدة المتقدمة فنتون الاشعة فوق الصوتية Index. décimale : 540 Chimie et sciences connexes Résumé :
The objective of this work is to study the removal of a triazoic anionic dye Acid Black 210 present in the tanning industry effluents by practical and not costly physico-chemical processes. The treatment methods used in this study for the removal of Acid Black 210 in synthetic solutions are adsorption, ion exchange and advanced oxidation. The adsorbent used are bentonite and calcite. Amberlite IRA400 resin is used for ion exchange. The three materials are characterized by DRX, ATR-FTIR, ATG/ATD and BET analysis. The advanced oxidation processes tested are Fenton (Fe(II)/H2O2) and Fenton/ultrasound (Fe (II)/H2O2/ultrasound). The obtained results, show that the Acid Black 210 removal by adsorption on calcite is more effective than that by bentonite. The dye removal by calcite is important at pH ≤6. However, in the case of bentonite, the removal is maximum at very acidic pH then decreases rapidly with the pH increase. The adsorption capacities of Acid Black 210 by calcite and bentonite are 210 mg/g and 71 mg/g respectively. Under ultrasonic irradiation, the Acid Black 210 removal by calcite and bentonite is improved. The removal of Acid Black 210 by Amberlite IRA400 is fast and important in a wide pH range (pH≤ 8). The temperature enhancement implies a slight increase in the dye removal. The maximum exchange capacity calculated by the Langmuir equation is 657 mg/g. The presence of competitive ions hes not a significant effect on the Acid Black removal 210 by Amberlite IRA400. The Acid Black 210 removal by the Fenton process is optimal at pH: 4 wathever the used conditions. The combination Fenton process with ultrasound, implies an acceleration of the oxidation reaction and a decrease of the efficiency.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/TAL7748.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11581 Elimination d’un colorant industriel par des méthodes physico-chimiques cas du Noir Acide 210. [texte imprimé] / Amina Talhi, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse . - 07-mars-21 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 185 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie: Chimie Analytique et Environnement Noir Acide 210 calcite bentonite Amberlite IRA400 adsorption échange d’ions oxydation avancée Fenton ultrasons traitement des eaux de tannage Acid Black 210 ion exchange advanced oxidation ultrasound tanning water treatment ملون اسود حمض 012الادمصاص التبادل الايوني طين البنتونيت الكالسيت آمبرليت IRA400الاكسدة المتقدمة فنتون الاشعة فوق الصوتية Index. décimale : 540 Chimie et sciences connexes Résumé :
The objective of this work is to study the removal of a triazoic anionic dye Acid Black 210 present in the tanning industry effluents by practical and not costly physico-chemical processes. The treatment methods used in this study for the removal of Acid Black 210 in synthetic solutions are adsorption, ion exchange and advanced oxidation. The adsorbent used are bentonite and calcite. Amberlite IRA400 resin is used for ion exchange. The three materials are characterized by DRX, ATR-FTIR, ATG/ATD and BET analysis. The advanced oxidation processes tested are Fenton (Fe(II)/H2O2) and Fenton/ultrasound (Fe (II)/H2O2/ultrasound). The obtained results, show that the Acid Black 210 removal by adsorption on calcite is more effective than that by bentonite. The dye removal by calcite is important at pH ≤6. However, in the case of bentonite, the removal is maximum at very acidic pH then decreases rapidly with the pH increase. The adsorption capacities of Acid Black 210 by calcite and bentonite are 210 mg/g and 71 mg/g respectively. Under ultrasonic irradiation, the Acid Black 210 removal by calcite and bentonite is improved. The removal of Acid Black 210 by Amberlite IRA400 is fast and important in a wide pH range (pH≤ 8). The temperature enhancement implies a slight increase in the dye removal. The maximum exchange capacity calculated by the Langmuir equation is 657 mg/g. The presence of competitive ions hes not a significant effect on the Acid Black removal 210 by Amberlite IRA400. The Acid Black 210 removal by the Fenton process is optimal at pH: 4 wathever the used conditions. The combination Fenton process with ultrasound, implies an acceleration of the oxidation reaction and a decrease of the efficiency.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/TAL7748.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11581 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité TAL/7748 TAL/7748 Thèse Bibliothèque principale Thèses Disponible
Titre : Photodegradation du naproxene induite par un Oxyde de Fer (III) (Goethite) sous forme particulaire et nanoparticulaire. Type de document : texte imprimé Auteurs : Nessrine Setifi, Auteur ; Nadra Debbache, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2019 Importance : 196 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
2 copies imprimées disponiblesLangues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie: Chimie Analytique et Environnement Naproxène Photodégradation Nanoparticule Nanocomposite Goethite Fenton نابروكسين التحلل الضوئي جسيمات متناهية الصغر بمركب متناهي في الصغر الجيوثايت فنتون Index. décimale : 540 Chimie et sciences connexes Résumé :
The photodegradation under artificial and solar irradiation of Naproxen (NPX, induced by 3 iron (III) oxy (hydroxide) based semiconductors (Goethite) was studied in aqueous solution in heterogeneous phase. The phototransformation of the substrate was followed by spectrophotometry and HPLC in the different systems. Semiconductors including particulate Goethite (GO), nanoparticle (nGO) and nanocomposite montmorillonite - Goethite (MGO) were synthesized at laboratory, and characterized by different methods (RDX, BET, SEM, TEM ...). The results of the XRD show good crystallinity. In addition, SEM and TEM analysis revealed that the particle sizes of GO, nGO and MGO are: 5 μm, 37.64 nm and 45.79 nm respectively. The removal of NPX in the presence of GO, in the absence and in the presence of light, has shown that the NPX is eliminated by both processes with a faster rate in the presence of light and seems closely dependent on the PH. The optimization of important parameters in the photochemical process was also undertaken in order to quantify the reagents necessary for the completion of the reaction. The addition of activators such as hydrogen peroxide and oxalic acid in the NPX-GO mixture significantly improves the disappearance of the substrate. In a second part, the degradation of NPX by nGO was undertaken in a similar way comparing with GO. It appeared in the systems nGO-H2O2-UV and nGO- AOx-UV are more efficient than the corresponding simple system. Finally, the performance of the new MGO catalyst has been demonstrated in the degradation of NPX. In the absence of light, an interaction between NPX and MGO was found where 33% of NPX was eliminated for a quantity of MGO of 1 g / L. Under light irradiation, 96.5% of NPX was degraded after 5 hours. The Fe (II) formed exclusively in the mixture shows the photocatalytic dissolution of the MGO. The influence of some parameters has been treated. The degradation efficiency of NPX in mixture (NPX-MGO- H2O2, pH = 3) made it possible to improve the rate of degradation to 100% NPX in 60 minutes. The formation of iron (II) in the H2O2- containing mixture creates the Fenton process under these conditions. The hydroxyl radicals have been demonstrated by the use of 1% isopropanol. Illumination of this mixture significantly advanced the reaction with 100% substrate degradation in only 10 minutes. Several parameters affecting this process have been optimized: pH, MGO dosage and H2O2 concentration. Under solar irradiation, the results showed that 30 minutes were sufficient for complete degradation of NPX at free pH. The effect of pH and some cationic metals allows considering this low-cost process in the elimination of this kind of emerging pollutants.Diplôme : Doctorat En ligne : ../theses/chimie/SET7532.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11371 Photodegradation du naproxene induite par un Oxyde de Fer (III) (Goethite) sous forme particulaire et nanoparticulaire. [texte imprimé] / Nessrine Setifi, Auteur ; Nadra Debbache, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2019 . - 196 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie: Chimie Analytique et Environnement Naproxène Photodégradation Nanoparticule Nanocomposite Goethite Fenton نابروكسين التحلل الضوئي جسيمات متناهية الصغر بمركب متناهي في الصغر الجيوثايت فنتون Index. décimale : 540 Chimie et sciences connexes Résumé :
The photodegradation under artificial and solar irradiation of Naproxen (NPX, induced by 3 iron (III) oxy (hydroxide) based semiconductors (Goethite) was studied in aqueous solution in heterogeneous phase. The phototransformation of the substrate was followed by spectrophotometry and HPLC in the different systems. Semiconductors including particulate Goethite (GO), nanoparticle (nGO) and nanocomposite montmorillonite - Goethite (MGO) were synthesized at laboratory, and characterized by different methods (RDX, BET, SEM, TEM ...). The results of the XRD show good crystallinity. In addition, SEM and TEM analysis revealed that the particle sizes of GO, nGO and MGO are: 5 μm, 37.64 nm and 45.79 nm respectively. The removal of NPX in the presence of GO, in the absence and in the presence of light, has shown that the NPX is eliminated by both processes with a faster rate in the presence of light and seems closely dependent on the PH. The optimization of important parameters in the photochemical process was also undertaken in order to quantify the reagents necessary for the completion of the reaction. The addition of activators such as hydrogen peroxide and oxalic acid in the NPX-GO mixture significantly improves the disappearance of the substrate. In a second part, the degradation of NPX by nGO was undertaken in a similar way comparing with GO. It appeared in the systems nGO-H2O2-UV and nGO- AOx-UV are more efficient than the corresponding simple system. Finally, the performance of the new MGO catalyst has been demonstrated in the degradation of NPX. In the absence of light, an interaction between NPX and MGO was found where 33% of NPX was eliminated for a quantity of MGO of 1 g / L. Under light irradiation, 96.5% of NPX was degraded after 5 hours. The Fe (II) formed exclusively in the mixture shows the photocatalytic dissolution of the MGO. The influence of some parameters has been treated. The degradation efficiency of NPX in mixture (NPX-MGO- H2O2, pH = 3) made it possible to improve the rate of degradation to 100% NPX in 60 minutes. The formation of iron (II) in the H2O2- containing mixture creates the Fenton process under these conditions. The hydroxyl radicals have been demonstrated by the use of 1% isopropanol. Illumination of this mixture significantly advanced the reaction with 100% substrate degradation in only 10 minutes. Several parameters affecting this process have been optimized: pH, MGO dosage and H2O2 concentration. Under solar irradiation, the results showed that 30 minutes were sufficient for complete degradation of NPX at free pH. The effect of pH and some cationic metals allows considering this low-cost process in the elimination of this kind of emerging pollutants.Diplôme : Doctorat En ligne : ../theses/chimie/SET7532.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11371 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité SET/7532 SET/7532 Thèse Bibliothèque principale Thèses Disponible
Permalink
Permalink
Permalink
Permalink
Permalink
