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Partager le résultat de cette recherche Interroger des sources externesAnalyse caractérisation et valorisation des eaux et des boues de la station d’epuration de Sidi-Merouane (Wilaya de Mila). / Amina Boughachiche
Titre : Analyse caractérisation et valorisation des eaux et des boues de la station d’epuration de Sidi-Merouane (Wilaya de Mila). Type de document : texte imprimé Auteurs : Amina Boughachiche, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse Mention d'édition : 08/11/2018 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 151 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 station d’épuration des eaux eaux épurée boues résiduaires valorisation charbon actif adsorption traitement des eaux wastewater treatment plant treated water waste sludge valorization activated carbon water treatment محطة تنقية المياه مياه التصفية حماة التثمين الرربون المنط الإدمصاص معالجة المياه Index. décimale : 540 Chimie et sciences connexes Résumé :
In this work, the purified water and waste sludge of Sidi Merouane wastewater treatment plant located in Mila in the Northeast Algeria are characterized in the objective of their valorization in agriculture. The sludge is also used in the production of activated carbon for water water treatment application. The quality of Sidi Merouane treated waters is evaluated through physicochemical analysis. The obtained results show that they are characterized by alkaline pH, high electrical conductivity and low concentrations of nitrate and phosphate. The contents of the analyzed heavy metals are below the limits of water discharges. The mineralogical composition of waste sludge is evaluated by XRD and FTIR analysis. It reveals the presence of clay phases associated with organic matter. Their physicochemical characterization is carried out by measuring pH, electrical conductivity and by analysis of major elements, nutrients, organic matter and metals. The obtained results show the mineral character of the Sidi Merouane waste sludge. Nitrogen is predominantly in organic form; among its mineral species, ammonium predominates whatever the season. Phosphorus is predominantly inorganic and the fraction bound to oxyhydroxids is the most important. The calculated C/N ratio shows that nitrogen is not immobilized.in the waste sludge of the Sidi Merouane wastewater treatment plant. The concentrations of the analyzed heavy metals are below the limits allowed for valorization sludge in agricultural. Activated carbons are prepared from waste sludge of Sidi Merouane plant by calcination at 550 °C and by chemical activation using an acidic mixture (H2SO4 + H3PO4). They are characterized by FTIR and BET analysis and by the determination of pHpzc and iodine number. The effectiveness of the use of the prepared carbons in waste water treatment is evaluated through the adsorption of an organic pollutant (a dye) and an inorganic pollutant (metal ion). A commercial activated carbon is also used for a comparison. The obtained results show that the activated carbon prepared by chemical activation is characterized by a high specific surface area (1114 m2/g), an important iodine number (1435) and an acidic pHpzc (3.6). Its adsorption capacities for Black Eriochrome T and chromium (III) ions are 370mg/g and 32mg/g respectively. These capacities are higher than those of the commercial activated carbon used.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/BOU7818.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11650 Analyse caractérisation et valorisation des eaux et des boues de la station d’epuration de Sidi-Merouane (Wilaya de Mila). [texte imprimé] / Amina Boughachiche, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse . - 08/11/2018 . - جامعة الإخوة منتوري قسنطينة, 2018 . - 151 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chime: Chimie Analytique et Environnement station d’épuration des eaux eaux épurée boues résiduaires valorisation charbon actif adsorption traitement des eaux wastewater treatment plant treated water waste sludge valorization activated carbon water treatment محطة تنقية المياه مياه التصفية حماة التثمين الرربون المنط الإدمصاص معالجة المياه Index. décimale : 540 Chimie et sciences connexes Résumé :
In this work, the purified water and waste sludge of Sidi Merouane wastewater treatment plant located in Mila in the Northeast Algeria are characterized in the objective of their valorization in agriculture. The sludge is also used in the production of activated carbon for water water treatment application. The quality of Sidi Merouane treated waters is evaluated through physicochemical analysis. The obtained results show that they are characterized by alkaline pH, high electrical conductivity and low concentrations of nitrate and phosphate. The contents of the analyzed heavy metals are below the limits of water discharges. The mineralogical composition of waste sludge is evaluated by XRD and FTIR analysis. It reveals the presence of clay phases associated with organic matter. Their physicochemical characterization is carried out by measuring pH, electrical conductivity and by analysis of major elements, nutrients, organic matter and metals. The obtained results show the mineral character of the Sidi Merouane waste sludge. Nitrogen is predominantly in organic form; among its mineral species, ammonium predominates whatever the season. Phosphorus is predominantly inorganic and the fraction bound to oxyhydroxids is the most important. The calculated C/N ratio shows that nitrogen is not immobilized.in the waste sludge of the Sidi Merouane wastewater treatment plant. The concentrations of the analyzed heavy metals are below the limits allowed for valorization sludge in agricultural. Activated carbons are prepared from waste sludge of Sidi Merouane plant by calcination at 550 °C and by chemical activation using an acidic mixture (H2SO4 + H3PO4). They are characterized by FTIR and BET analysis and by the determination of pHpzc and iodine number. The effectiveness of the use of the prepared carbons in waste water treatment is evaluated through the adsorption of an organic pollutant (a dye) and an inorganic pollutant (metal ion). A commercial activated carbon is also used for a comparison. The obtained results show that the activated carbon prepared by chemical activation is characterized by a high specific surface area (1114 m2/g), an important iodine number (1435) and an acidic pHpzc (3.6). Its adsorption capacities for Black Eriochrome T and chromium (III) ions are 370mg/g and 32mg/g respectively. These capacities are higher than those of the commercial activated carbon used.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/BOU7818.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11650 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7818 BOU/7818 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 : Évaluation de la qualité des eaux souterraines de Constantine et étude du potentiel d'utilisation d'un matériau naturel enrobé par un polymère pour le traitement des eaux. Type de document : texte imprimé Auteurs : Awatef Dali, Auteur ; Chabane Mouats, Directeur de thèse Mention d'édition : 17/06/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 165 f. Format : 30 cm. Note générale : Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ChimieTags : Chimie: Chimie analytique instrumentale appliquée Eaux souterraines Analyses physicochimiques et microbiologiques Traitement des eaux Polyaniline Luffa cylindrique Adsorption du chrome Groundwater Physicochemical and microbiological analysis Water treatment Luffa cylindrica Chromium adsorption المياه الجوفية التحليلات الفيزيائية والكيميائية والميكروبيولوجية معالجة المياه البوليانيلين اللوفة الأسطوانية امتصاص الكروم Index. décimale : 540 Chimie et sciences connexes Résumé :
The continuous monitoring and protection of the quality of water resources plays an important role in public health and also in the environment. Given this major importance, this study was conducted in order to determine the level of contamination of groundwater in the wilaya of Constantine. On the other hand, the protection of these water resources against pollution. Water samples were collected in two regions: Ain Smara and Ibn Badis. Physicochemical and microbiological analyses were carried out, and it was found that the groundwater selected was chemically and bacteriologically unsuitable for human consumption. Human activities have a significant influence on the quality of water resources in Constantine. For this purpose, we tried to develop an original adsorbent to treat the influence of these activities. The coating of the fibrous skeleton of luffa cylindrica (LC) with polyaniline (PANI) was carried out by in-situ polymerization of aniline. A thin PANI layer in its emeraldine-salt form got bound on to the LC surface, as revealed by the green color the latter developed, procuring more roughness to the luffa fibers. The surfaces of both materials, i.e., the purified original luffa (LC) and the PANI-coated luffa (PANI/LC) were characterized by FTIR, completed by the Raman, SEM/EDX and XRD. After characterization, PANI/LC was tested for its capacity to adsorb hexavalent chromium anionic species. First, the emergence of the chromium characteristic peak in the EDX spectrum brought experimental evidence for the effective sorption of chromium onto the PANI/LC surface. Then, the novel material displayed a high efficiency to retain the metallic pollutant, going up to ~ 300 mg/g. Thus, after the PANI-grafting, this light and cheap agricultural by-product should compete advantageously with commercial anionic exchangers, at least in terms of efficiency and economically. Besides, adsorption parameters were examined. The Cr (VI) uptake process was found to follow second order kinetics. The computed thermodynamic parameters (namely ΔH°, ΔS° and ΔG°) indicate that adsorption is exothermic and spontaneous. None of some classical models fitted the equilibrium sorption data, a result that expresses the sorption mechanism complexity.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/DAL7765.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11598 Évaluation de la qualité des eaux souterraines de Constantine et étude du potentiel d'utilisation d'un matériau naturel enrobé par un polymère pour le traitement des eaux. [texte imprimé] / Awatef Dali, Auteur ; Chabane Mouats, Directeur de thèse . - 17/06/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 165 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie: Chimie analytique instrumentale appliquée Eaux souterraines Analyses physicochimiques et microbiologiques Traitement des eaux Polyaniline Luffa cylindrique Adsorption du chrome Groundwater Physicochemical and microbiological analysis Water treatment Luffa cylindrica Chromium adsorption المياه الجوفية التحليلات الفيزيائية والكيميائية والميكروبيولوجية معالجة المياه البوليانيلين اللوفة الأسطوانية امتصاص الكروم Index. décimale : 540 Chimie et sciences connexes Résumé :
The continuous monitoring and protection of the quality of water resources plays an important role in public health and also in the environment. Given this major importance, this study was conducted in order to determine the level of contamination of groundwater in the wilaya of Constantine. On the other hand, the protection of these water resources against pollution. Water samples were collected in two regions: Ain Smara and Ibn Badis. Physicochemical and microbiological analyses were carried out, and it was found that the groundwater selected was chemically and bacteriologically unsuitable for human consumption. Human activities have a significant influence on the quality of water resources in Constantine. For this purpose, we tried to develop an original adsorbent to treat the influence of these activities. The coating of the fibrous skeleton of luffa cylindrica (LC) with polyaniline (PANI) was carried out by in-situ polymerization of aniline. A thin PANI layer in its emeraldine-salt form got bound on to the LC surface, as revealed by the green color the latter developed, procuring more roughness to the luffa fibers. The surfaces of both materials, i.e., the purified original luffa (LC) and the PANI-coated luffa (PANI/LC) were characterized by FTIR, completed by the Raman, SEM/EDX and XRD. After characterization, PANI/LC was tested for its capacity to adsorb hexavalent chromium anionic species. First, the emergence of the chromium characteristic peak in the EDX spectrum brought experimental evidence for the effective sorption of chromium onto the PANI/LC surface. Then, the novel material displayed a high efficiency to retain the metallic pollutant, going up to ~ 300 mg/g. Thus, after the PANI-grafting, this light and cheap agricultural by-product should compete advantageously with commercial anionic exchangers, at least in terms of efficiency and economically. Besides, adsorption parameters were examined. The Cr (VI) uptake process was found to follow second order kinetics. The computed thermodynamic parameters (namely ΔH°, ΔS° and ΔG°) indicate that adsorption is exothermic and spontaneous. None of some classical models fitted the equilibrium sorption data, a result that expresses the sorption mechanism complexity.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/DAL7765.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11598 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DAL/7765 DAL/7765 Thèse Bibliothèque principale Thèses Disponible
Titre : Synthèse et caractérisation de matériaux composites de fer Application à l’élimination des ions Cr(VI) Type de document : texte imprimé Auteurs : Nourhane Amani Bounab, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse ; Laurent Duclaux, Directeur de thèse Mention d'édition : 12/04/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 161 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 matériaux composites Fe(III) oxyde de fer Amberlite IRN150 kaolinite fer zéro valent Cr(VI) traitement des eaux composites materials iron oxide zero valent iron water treatment Index. décimale : 540 Chimie et sciences connexes Résumé :
The present work focuses on the development of new efficient and practical composite materials for the removal of pollutants from water. The main objective is to prepare iron composites and their use in the removal of Cr(VI) ions. Three types of composites were prepared: Fe(III)-Amberlite IRN150, Fe(III)- kaolinite and zero valent iron-kaolinite. These materials were characterized by SEMEDX, XRD, ATR-FTIR, BET and by TGA-DTA analysis. Fe(III)-Amberlite IRN150 composites were prepared by ion exchange processus and by precipitation under magnetic stirring and under ultrasound. Fe(III)-kaolinite composites were prepared with different proportions of iron and kaolinite, under magnetic stirring and under ultrasound. Zero valent iron-kaolinite composites as well as zero valent iron were prepared under mechanical stirring and under ultrasound. The characterization of the prepared composites shows the formation of hydrated iron oxide only in the case of Fe(III)-Amberlite IRN150 composites. In the case of Fe(III)- kaolinite and zero valent iron-kaolinite composites, the combination with iron is confirmed by EDX analysis. The results, of Cr(VI) removal show that whatever the used composite, the highest Cr(VI) removal is observed at acidic pH. The use of ultrasound in the preparation of the composites or in Cr(VI) removal experiments, enhances the composites efficencies. Fe(III)-Amberlite IRN150 composites prepared by precipitation are more efficient in removing Cr(VI) ions than those prepared by ion exchange processus. The removal of Cr(VI) ions by Fe(III)-kaolinite composites increases with the increase of iron percentage. Their removal capacities are greater than that of kaolinite and lower than that of hydrated iron oxide. In the case of zero iron nanoparticles alone and supported on kaolinite, the removal of Cr(VI) ions is maximum at acidic pH. Zero valent ironkaolinite composites are less efficient than zero valent iron alone for removing Cr(VI) ions.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/BOU7751.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11584 Synthèse et caractérisation de matériaux composites de fer Application à l’élimination des ions Cr(VI) [texte imprimé] / Nourhane Amani Bounab, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse ; Laurent Duclaux, Directeur de thèse . - 12/04/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 161 f. ; 30 cm.
Doctorat 3éme CYCLE LMD.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Chimie: Chimie Analytique et Environnement matériaux composites Fe(III) oxyde de fer Amberlite IRN150 kaolinite fer zéro valent Cr(VI) traitement des eaux composites materials iron oxide zero valent iron water treatment Index. décimale : 540 Chimie et sciences connexes Résumé :
The present work focuses on the development of new efficient and practical composite materials for the removal of pollutants from water. The main objective is to prepare iron composites and their use in the removal of Cr(VI) ions. Three types of composites were prepared: Fe(III)-Amberlite IRN150, Fe(III)- kaolinite and zero valent iron-kaolinite. These materials were characterized by SEMEDX, XRD, ATR-FTIR, BET and by TGA-DTA analysis. Fe(III)-Amberlite IRN150 composites were prepared by ion exchange processus and by precipitation under magnetic stirring and under ultrasound. Fe(III)-kaolinite composites were prepared with different proportions of iron and kaolinite, under magnetic stirring and under ultrasound. Zero valent iron-kaolinite composites as well as zero valent iron were prepared under mechanical stirring and under ultrasound. The characterization of the prepared composites shows the formation of hydrated iron oxide only in the case of Fe(III)-Amberlite IRN150 composites. In the case of Fe(III)- kaolinite and zero valent iron-kaolinite composites, the combination with iron is confirmed by EDX analysis. The results, of Cr(VI) removal show that whatever the used composite, the highest Cr(VI) removal is observed at acidic pH. The use of ultrasound in the preparation of the composites or in Cr(VI) removal experiments, enhances the composites efficencies. Fe(III)-Amberlite IRN150 composites prepared by precipitation are more efficient in removing Cr(VI) ions than those prepared by ion exchange processus. The removal of Cr(VI) ions by Fe(III)-kaolinite composites increases with the increase of iron percentage. Their removal capacities are greater than that of kaolinite and lower than that of hydrated iron oxide. In the case of zero iron nanoparticles alone and supported on kaolinite, the removal of Cr(VI) ions is maximum at acidic pH. Zero valent ironkaolinite composites are less efficient than zero valent iron alone for removing Cr(VI) ions.
Note de contenu :
Annexes.Diplôme : Doctorat En ligne : ../theses/chimie/BOU7751.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11584 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7751 BOU/7751 Thèse Bibliothèque principale Thèses Disponible
