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Partager le résultat de cette recherche Interroger des sources externesEtude de l’Interaction des ions Cr(III) avec des Surfaces Solides dans l’Environnement et le Traitement des Eaux / Souad Merabet -Boumendjel
Titre : Etude de l’Interaction des ions Cr(III) avec des Surfaces Solides dans l’Environnement et le Traitement des Eaux Type de document : texte imprimé Auteurs : Souad Merabet -Boumendjel, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 167 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : chromium (III) sediments iron oxyhydroxide aluminum oxyhydroxide calcite kaolinite adsorption coprecipitation ion exchange الكروم ( )IIIالرواسب اوكسيهيدروكسيد الحديد اوكسيهيدروكسيد الألومنيوم الكالسيت الكولنيت الامتزاز الترسيب المصطحب التبادل الأيوني chrome(III) sédiments oxyhydroxyde de fer oxyhydroxyde d’aluminium coprécipitation échange d’ions Index. décimale : 540 Chimie et sciences connexes Résumé : In the present work, the fixing of chromium (III) is studied using various solids
encountered in aquatic environment and water treatment.
In the environment, sediments were collected from Rhumel and Hemimim rivers located in
Constantine city in the North East Algeria. Commercial solid were used (alumina, calcite, kaolinite and ion exchangers) and others were prepared (iron and aluminum oxyhydroxides).
All solids were characterized by XRD and FTIR analysis. The fixing of Cr (III) ions was evaluated according to different parameters in static mode. Kinetic and equilibrium studies were performed.
The obtained results show that for the used sediments, the binding capacity of Cr (III) ions is in relation to their constitution. The significant presence of quartz involves a decrease in fixing rates. The use of the different minerals encountered in the sediments shows that the fixing rate of chromium (III) increases in the order:
kaolinite < calcite < alumina < ferrihydrite
In all cases, fixing kinetic is best described by the second order model. The Temkin model is more appropriate to describe the fixing isotherms of chromium in the case of sediments.
However, Langmuir and Freundlich models better describe in the case of ferrihydrite and alumina.
In water treatment, the effectiveness of Cr (III) removal by the oxyhydroxides of Fe (III) or / and Al (III) freshly prepared depends largely on the water pH. It follows the order:
Al (III) < Fe(III)/Al(III) < Fe(III).
The maximum exchange capacity of IR120 and IRC 86 resins towards Cr (III) ions are
112mg/g and 23mg/g respectively. The interaction of Cr(III) ions with the two resins is controlled by a diffusion process.
Note de contenu :
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/MER6914.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10266 Etude de l’Interaction des ions Cr(III) avec des Surfaces Solides dans l’Environnement et le Traitement des Eaux [texte imprimé] / Souad Merabet -Boumendjel, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2016 . - 167 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : chromium (III) sediments iron oxyhydroxide aluminum oxyhydroxide calcite kaolinite adsorption coprecipitation ion exchange الكروم ( )IIIالرواسب اوكسيهيدروكسيد الحديد اوكسيهيدروكسيد الألومنيوم الكالسيت الكولنيت الامتزاز الترسيب المصطحب التبادل الأيوني chrome(III) sédiments oxyhydroxyde de fer oxyhydroxyde d’aluminium coprécipitation échange d’ions Index. décimale : 540 Chimie et sciences connexes Résumé : In the present work, the fixing of chromium (III) is studied using various solids
encountered in aquatic environment and water treatment.
In the environment, sediments were collected from Rhumel and Hemimim rivers located in
Constantine city in the North East Algeria. Commercial solid were used (alumina, calcite, kaolinite and ion exchangers) and others were prepared (iron and aluminum oxyhydroxides).
All solids were characterized by XRD and FTIR analysis. The fixing of Cr (III) ions was evaluated according to different parameters in static mode. Kinetic and equilibrium studies were performed.
The obtained results show that for the used sediments, the binding capacity of Cr (III) ions is in relation to their constitution. The significant presence of quartz involves a decrease in fixing rates. The use of the different minerals encountered in the sediments shows that the fixing rate of chromium (III) increases in the order:
kaolinite < calcite < alumina < ferrihydrite
In all cases, fixing kinetic is best described by the second order model. The Temkin model is more appropriate to describe the fixing isotherms of chromium in the case of sediments.
However, Langmuir and Freundlich models better describe in the case of ferrihydrite and alumina.
In water treatment, the effectiveness of Cr (III) removal by the oxyhydroxides of Fe (III) or / and Al (III) freshly prepared depends largely on the water pH. It follows the order:
Al (III) < Fe(III)/Al(III) < Fe(III).
The maximum exchange capacity of IR120 and IRC 86 resins towards Cr (III) ions are
112mg/g and 23mg/g respectively. The interaction of Cr(III) ions with the two resins is controlled by a diffusion process.
Note de contenu :
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/MER6914.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10266 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité MER/6914 MER/6914 Thèse Bibliothèque principale Thèses Disponible
Titre : Etude de l’elimination des ions Cr(VI) par des procédés physico-chimiques application aux eaux de chromage Type de document : texte imprimé Auteurs : Imene Chaabna, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 172 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Cr(VI) traitement des eaux adsorption échange d’ions réduction charbon actif ferrihydrite composite (charbon actif/fer) Amberlite A21 Amberlite IRN78 eaux de chromage water treatment ion exchange reduction activated carbon composite (activated carbon/iron) chrome plating water "الكروم السداسي معالجة المیاه الإدمصاص التبادل الأیوني الإرجاع فحم منشط فیریدریث مركب (فحم- حدید ) Index. décimale : 540 Chimie et sciences connexes Résumé : The present work focuses on the development of effective, practical and inexpensive physico-chemical processes for the decontamination of water containing Cr (VI) ions.
Adsorption removal was carried out using commercial activated charcoal, prepared ferrihydrite and composites (activated carbon/iron) prepared by precipitation of Fe (III) ions in the presence of coal at mass ratios (1/10) and 1/5). These adsorbents are characterized by DRX, ATR-FTIR, BET analysis, thermal analysis and by physicochemical analysis. The ion exchange removal is carried out using the Amberlite A21 resin (weak base type) and the Amberlite IRN78 resin (strong base type). The removal efficiency of Cr (VI) ions by precipitation after reduction is evaluated using ascorbic acid and sodium sulfite as reducing agents and soda and lime as precipitants.
In synthetic solutions, macroscopic experiments of Cr (VI) ions removal are carried out in the absence and in the presence of competitives ions in batch and in column (according the case). kinetics, equilibrium and thermodynamics studies are carried out.
The binding of Cr (VI) ions by adsorption is also studied through spectroscopic analysis. In chrome-plating waters, removal of Cr (VI) ions by these methods is evaluated as a function of pH The synthesized composites are characterized by the predominance of mesopores. Their specific surfaces are similar to that of ferrihydrite. Increasing the amount of iron involves increasing the content of basic functions and the formation of hematite.
The results of macroscopic experiments show that whatever the method used, the maximum elimination of Cr (VI) ions is recorded at acidic pH. The effectiveness of sodium sulfite in reducing Cr (VI) ions decreases rapidly with increasing pH. The increase in temperature implies an increase in the elimination in the case of the resins
and a decrease in the case of the adsorbents. The presence of competitive ions implies a decrease in the optimum pH range of the removal and a slowing down of adsorption and exchange processes. The removal efficiency of Cr (VI) ions by ferrihydrite, composites and resins is strongly influenced by the presence of sulfate ions.
The spectroscopic analysis (ATR-FTIR) suggest that the mechanism of Cr (VI) uptake by ferrihydrite and composites depends on pH and the presence of competitive ions. At pH <6, Cr (VI) ions form inner-sphere surface complexes. Whatever the pH, the interaction of the Cr (VI) ions is essentially electrostatic in the presence of the
competitive ions.
In chrome-plating waters, the efficiencies of Cr (VI) removal by the used solids at pH: 3 follow the order: IRN78> CAC> CACFe (1/5)> Ferrihydrite.
Diplôme : Doctorat En ligne : ../theses/chimie/CHA7019.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10421 Etude de l’elimination des ions Cr(VI) par des procédés physico-chimiques application aux eaux de chromage [texte imprimé] / Imene Chaabna, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2017 . - 172 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Cr(VI) traitement des eaux adsorption échange d’ions réduction charbon actif ferrihydrite composite (charbon actif/fer) Amberlite A21 Amberlite IRN78 eaux de chromage water treatment ion exchange reduction activated carbon composite (activated carbon/iron) chrome plating water "الكروم السداسي معالجة المیاه الإدمصاص التبادل الأیوني الإرجاع فحم منشط فیریدریث مركب (فحم- حدید ) Index. décimale : 540 Chimie et sciences connexes Résumé : The present work focuses on the development of effective, practical and inexpensive physico-chemical processes for the decontamination of water containing Cr (VI) ions.
Adsorption removal was carried out using commercial activated charcoal, prepared ferrihydrite and composites (activated carbon/iron) prepared by precipitation of Fe (III) ions in the presence of coal at mass ratios (1/10) and 1/5). These adsorbents are characterized by DRX, ATR-FTIR, BET analysis, thermal analysis and by physicochemical analysis. The ion exchange removal is carried out using the Amberlite A21 resin (weak base type) and the Amberlite IRN78 resin (strong base type). The removal efficiency of Cr (VI) ions by precipitation after reduction is evaluated using ascorbic acid and sodium sulfite as reducing agents and soda and lime as precipitants.
In synthetic solutions, macroscopic experiments of Cr (VI) ions removal are carried out in the absence and in the presence of competitives ions in batch and in column (according the case). kinetics, equilibrium and thermodynamics studies are carried out.
The binding of Cr (VI) ions by adsorption is also studied through spectroscopic analysis. In chrome-plating waters, removal of Cr (VI) ions by these methods is evaluated as a function of pH The synthesized composites are characterized by the predominance of mesopores. Their specific surfaces are similar to that of ferrihydrite. Increasing the amount of iron involves increasing the content of basic functions and the formation of hematite.
The results of macroscopic experiments show that whatever the method used, the maximum elimination of Cr (VI) ions is recorded at acidic pH. The effectiveness of sodium sulfite in reducing Cr (VI) ions decreases rapidly with increasing pH. The increase in temperature implies an increase in the elimination in the case of the resins
and a decrease in the case of the adsorbents. The presence of competitive ions implies a decrease in the optimum pH range of the removal and a slowing down of adsorption and exchange processes. The removal efficiency of Cr (VI) ions by ferrihydrite, composites and resins is strongly influenced by the presence of sulfate ions.
The spectroscopic analysis (ATR-FTIR) suggest that the mechanism of Cr (VI) uptake by ferrihydrite and composites depends on pH and the presence of competitive ions. At pH <6, Cr (VI) ions form inner-sphere surface complexes. Whatever the pH, the interaction of the Cr (VI) ions is essentially electrostatic in the presence of the
competitive ions.
In chrome-plating waters, the efficiencies of Cr (VI) removal by the used solids at pH: 3 follow the order: IRN78> CAC> CACFe (1/5)> Ferrihydrite.
Diplôme : Doctorat En ligne : ../theses/chimie/CHA7019.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10421 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité CHA/7019 CHA/7019 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
