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Auteur Chahrazed Boukhalfa- Djebbar |
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Affiner la recherche Interroger des sources externesEtude de l’elimination des ions Cr(VI) par des procédés physico-chimiques application aux eaux de chromage / Imene Chaabna
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 "?????? ??????? ?????? ?????? ???????? ??????? ??????? ??????? ??? ???? ???? (???- ???? ) 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 : https://bu.umc.edu.dz/md/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 . - [S.l.] : 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 "?????? ??????? ?????? ?????? ???????? ??????? ??????? ??????? ??? ???? ???? (???- ???? ) 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 : https://bu.umc.edu.dz/md/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 : 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 ?????? ( )III??????? ?????????????? ?????? ?????????????? ?????????? ???????? ??????? ??????? 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 : https://bu.umc.edu.dz/md/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 . - [S.l.] : 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 ?????? ( )III??????? ?????????????? ?????? ?????????????? ?????????? ???????? ??????? ??????? 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 : https://bu.umc.edu.dz/md/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 macroscopique et spectroscopique de la fixation des Ions phosphate sur les oxyhydroxydes de Fer -Application aux sédiments aquatiques Type de document : texte imprimé Auteurs : Lamia Boukemara, 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 : Phosphate Adsorption Ferrihydrite Goethite Hématite Sédiments Analyse spectroscopique DRIFT Phosphorus Hematite Sediment Spectroscopic analysis DRIFT ?????? ?????? ???????? ???????????????? ?????? ??????? ???????? ?????????
???????Index. décimale : 540 Chimie et sciences connexes Résumé : The present study is a contribution to the evaluation of the adsorbing properties of
iron oxyhydroxides (Ferrihydrite, Goethite and Hematite) towards phosphate ions. As
application, the evaluation of the retention of phosphate by mining sediments was
evaluated. Ferrihydrite, goethite and hematite were prepared in laboratory. The used
sediments came from a mining site located in the North-eastern of Algeria in the region
of Oum Toub.
The prepared iron oxyhydroxides and sediment samples were characterized by DRX,
DRIFT, SEM, BET, PZC, TGA, DSC and particles size analysis,. The obtained results
show that ferrihydrite has the highest surface area and particles size with the
predominance of micropores. Goethite and hematite are characterized by the presence of
mesopores. The sampled sediments consist essentially of quartz, jarosite, kaolinite,
schwertmannite and goethite.
Phosphate sorption was studied through macroscopics and spectroscopics analysis. The
macroscopic experiments were carried out in batch in order to determine the effects of
various parameters. Equilibrium and thermodynamic studies were performed.
The macroscopic results show that the phosphate ions fixation on the prepared iron
oxyhydroxides is strongly related to the pH; it is significant at acidic pH (pH <5). The
phosphate adsorption capacities of the iron oxyhydroxides follow the order:
Ferrihydrite> Goethite> Hematite. The calculated thermodynamic parameters show that
the adsorption process is endothermic in the case of ferrihydrite and exothermic in the
cases of goethite and hematite. The effects of the presence of foreign ions depend on the
nature of the ion and the iron oxyhydroxide. At pH <7, a decrease in the binding of
phosphate ions is recorded in the presence of Cd (II) ions in the case of goethite and
hematite. In the presence of Cu (II), Pb (II) and Cd (II), a clear improvement in the
binding is recorded in the case of ferrihydrite at pH> 7. In aquatic environment, the
phosphate uptake by the mining sediments is related to their composition. The
predominance of amorphous iron oxyhydroxides implies better adsorption. However,
that of quartz causes a decrease in the fixing rate.
The spectroscopic analysis (DRIFT) show that in the absence of competitive ions,
phosphates form inner sphere complexes with the symmetry C3v in the case of
ferrihydrite and the symmetry C2v in the case of goethite and hematite. The presence of
chromate and oxalate ions involves a modification of the mechanism of phosphate ions
retention. In the presence of cations, the formation of ternary complexes is shown in the
case of ferrihydrite. In mining sediments, phosphate replaces sulphate in shwertmannite.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU7050.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10550 Etude macroscopique et spectroscopique de la fixation des Ions phosphate sur les oxyhydroxydes de Fer -Application aux sédiments aquatiques [texte imprimé] / Lamia Boukemara, Auteur ; Chahrazed Boukhalfa- Djebbar, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 172 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ChimieTags : Phosphate Adsorption Ferrihydrite Goethite Hématite Sédiments Analyse spectroscopique DRIFT Phosphorus Hematite Sediment Spectroscopic analysis DRIFT ?????? ?????? ???????? ???????????????? ?????? ??????? ???????? ?????????
???????Index. décimale : 540 Chimie et sciences connexes Résumé : The present study is a contribution to the evaluation of the adsorbing properties of
iron oxyhydroxides (Ferrihydrite, Goethite and Hematite) towards phosphate ions. As
application, the evaluation of the retention of phosphate by mining sediments was
evaluated. Ferrihydrite, goethite and hematite were prepared in laboratory. The used
sediments came from a mining site located in the North-eastern of Algeria in the region
of Oum Toub.
The prepared iron oxyhydroxides and sediment samples were characterized by DRX,
DRIFT, SEM, BET, PZC, TGA, DSC and particles size analysis,. The obtained results
show that ferrihydrite has the highest surface area and particles size with the
predominance of micropores. Goethite and hematite are characterized by the presence of
mesopores. The sampled sediments consist essentially of quartz, jarosite, kaolinite,
schwertmannite and goethite.
Phosphate sorption was studied through macroscopics and spectroscopics analysis. The
macroscopic experiments were carried out in batch in order to determine the effects of
various parameters. Equilibrium and thermodynamic studies were performed.
The macroscopic results show that the phosphate ions fixation on the prepared iron
oxyhydroxides is strongly related to the pH; it is significant at acidic pH (pH <5). The
phosphate adsorption capacities of the iron oxyhydroxides follow the order:
Ferrihydrite> Goethite> Hematite. The calculated thermodynamic parameters show that
the adsorption process is endothermic in the case of ferrihydrite and exothermic in the
cases of goethite and hematite. The effects of the presence of foreign ions depend on the
nature of the ion and the iron oxyhydroxide. At pH <7, a decrease in the binding of
phosphate ions is recorded in the presence of Cd (II) ions in the case of goethite and
hematite. In the presence of Cu (II), Pb (II) and Cd (II), a clear improvement in the
binding is recorded in the case of ferrihydrite at pH> 7. In aquatic environment, the
phosphate uptake by the mining sediments is related to their composition. The
predominance of amorphous iron oxyhydroxides implies better adsorption. However,
that of quartz causes a decrease in the fixing rate.
The spectroscopic analysis (DRIFT) show that in the absence of competitive ions,
phosphates form inner sphere complexes with the symmetry C3v in the case of
ferrihydrite and the symmetry C2v in the case of goethite and hematite. The presence of
chromate and oxalate ions involves a modification of the mechanism of phosphate ions
retention. In the presence of cations, the formation of ternary complexes is shown in the
case of ferrihydrite. In mining sediments, phosphate replaces sulphate in shwertmannite.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU7050.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10550 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7050 BOU/7050 Thèse Bibliothèque principale Thèses Disponible
