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Partager le résultat de cette recherche Interroger des sources externesElimination des polluants organiques par méthodes physicochimiques et photochimiques en milieux aqueux. / Abdessemed Ala
Titre : Elimination des polluants organiques par méthodes physicochimiques et photochimiques en milieux aqueux. : Cas de l’éthyle violet et du rouge congo (séparés et mélangés) et de la monochloramine Type de document : texte imprimé Auteurs : Abdessemed Ala, Auteur ; Kamel Djebbar, Auteur Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 224 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Éthyle Violet Rouge Congo Mochloramine TiO2 Charbon actif ZnO Adsorption Rayonnement UV Photolyse H2O2 NaOCl •OH Ethyl violet Congo red Monochloramine Activated carbon UV radiation Photolysis Violet Ethyle) (Congo Rouge) ???????????? (NH2Cl) (PC500 TiO2) ????? ???? (ZnO) ?????? ???? ??? ??????? (H2O2) (NaOCl) (•OH ) (•Cl) Index. décimale : 540 Chimie et sciences connexes Résumé : The aim of this research is to study the decolorization of two dyes separated and in a mixture by physico-chemical processes (adsorption, TiO2 and CA-ZnO) and photocatalytic processes like: TiO2/UV and CA-ZnO/UV. Another study has been led on the degradation of Monocloramine in homogeneous phase via direct UV photolysis, H2O2/UV and
NaOCl/UV. Treated separately, both dyes have shown an appreciable adsorption on the two supports and that this process is well represented by an apparent kinetic of order 2.
Besides, Congo Red and Ethyl Violet are described by isotherms of type L and S respectively and that process is also well represented by the model of Langmuir for Ethyl Violet and Redlish-Peterson of Congo Red. On the other hand, the photocatalytic system led via TiO2/UV has been efficient toward both dyes and this process follows an apparent
rate constant of order 1. In another part, this process is well described by the kinetic model of Langmuir-Hinshelwood and that oxidation process occurs, mainly, in surface. The inhibition process has been demonstrated by alcohols proving thereby that radicals •OH are the main oxidation route. The photoproducts issued from the decolorization of the two dyes have been identified using masse spectroscopy technic. This has permitted to establish a mechanism of degradation for the two dyes. Same efficiency is obtained using CAZnO/UV process (CA: activated carbon issued from olive cakes). In another side and in the mixture, the treatment of the two dyes by both systems has, shown that the efficiency decreases as the concentration of the other added dye increases. Indeed, the addition of the second substrate slows down the disappearance speed of the other. The kinitics model
remained unchanged for the two processes (2nd order for adsorption and 1 st order for photocatalysis) The last part treats the degradation of the Monochloramine which occurs via direct UV photolysis in presence of two lamps:
BP (254 nm) and MP (200-600 nm).
The obtained results have been significant. Furthermore, these results have been greatly enhanced mainly by H2O2/UV. However, for NaOCl/UV system we could mention that the disappearance rate slows down because of the formation of photoproducts such as: Mono, Di and Trichloramines. Moreover, the process is well described by an apparent kinetic of order 1 and those photoproducts identified in H2O2/UV, NaOCl/UV and direct photolysis systems are nitrates and nitritesDiplôme : Doctorat en sciences En ligne : ../theses/chimie/ALA6959.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10358 Elimination des polluants organiques par méthodes physicochimiques et photochimiques en milieux aqueux. : Cas de l’éthyle violet et du rouge congo (séparés et mélangés) et de la monochloramine [texte imprimé] / Abdessemed Ala, Auteur ; Kamel Djebbar, Auteur . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 224 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Éthyle Violet Rouge Congo Mochloramine TiO2 Charbon actif ZnO Adsorption Rayonnement UV Photolyse H2O2 NaOCl •OH Ethyl violet Congo red Monochloramine Activated carbon UV radiation Photolysis Violet Ethyle) (Congo Rouge) ???????????? (NH2Cl) (PC500 TiO2) ????? ???? (ZnO) ?????? ???? ??? ??????? (H2O2) (NaOCl) (•OH ) (•Cl) Index. décimale : 540 Chimie et sciences connexes Résumé : The aim of this research is to study the decolorization of two dyes separated and in a mixture by physico-chemical processes (adsorption, TiO2 and CA-ZnO) and photocatalytic processes like: TiO2/UV and CA-ZnO/UV. Another study has been led on the degradation of Monocloramine in homogeneous phase via direct UV photolysis, H2O2/UV and
NaOCl/UV. Treated separately, both dyes have shown an appreciable adsorption on the two supports and that this process is well represented by an apparent kinetic of order 2.
Besides, Congo Red and Ethyl Violet are described by isotherms of type L and S respectively and that process is also well represented by the model of Langmuir for Ethyl Violet and Redlish-Peterson of Congo Red. On the other hand, the photocatalytic system led via TiO2/UV has been efficient toward both dyes and this process follows an apparent
rate constant of order 1. In another part, this process is well described by the kinetic model of Langmuir-Hinshelwood and that oxidation process occurs, mainly, in surface. The inhibition process has been demonstrated by alcohols proving thereby that radicals •OH are the main oxidation route. The photoproducts issued from the decolorization of the two dyes have been identified using masse spectroscopy technic. This has permitted to establish a mechanism of degradation for the two dyes. Same efficiency is obtained using CAZnO/UV process (CA: activated carbon issued from olive cakes). In another side and in the mixture, the treatment of the two dyes by both systems has, shown that the efficiency decreases as the concentration of the other added dye increases. Indeed, the addition of the second substrate slows down the disappearance speed of the other. The kinitics model
remained unchanged for the two processes (2nd order for adsorption and 1 st order for photocatalysis) The last part treats the degradation of the Monochloramine which occurs via direct UV photolysis in presence of two lamps:
BP (254 nm) and MP (200-600 nm).
The obtained results have been significant. Furthermore, these results have been greatly enhanced mainly by H2O2/UV. However, for NaOCl/UV system we could mention that the disappearance rate slows down because of the formation of photoproducts such as: Mono, Di and Trichloramines. Moreover, the process is well described by an apparent kinetic of order 1 and those photoproducts identified in H2O2/UV, NaOCl/UV and direct photolysis systems are nitrates and nitritesDiplôme : Doctorat en sciences En ligne : ../theses/chimie/ALA6959.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10358 Exemplaires
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Titre : Etude de la Laccase produite par des Mycètes isolés à partir de différents ecosystèmes Algériens Type de document : texte imprimé Auteurs : Sara Benhassine, Auteur ; Noreddine Kacem Chaouche, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 104 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : ???? ????? ??????? ???? ??????? ???? ???????
Laccase Trichoderma longibrachiatum Trametes versicolor Chaetomium
globosum pumpkin waste Malachite Green Congo Red déchets de citrouille Vert de Malachite Rouge CongoIndex. décimale : 570 Sciences de la vie. Biologie Résumé : 1 fungal isolates were isolated from forests in eastern Algeria (Kenouaâ, Belezma and
Chettaba), three of them showed positive laccase activity. The morphological and molecular
study carried out allowed identifying them as Trichoderma longibrachiatum, Trametes
versicolor and Chaetomium globosum.
The production kinetics of laccase on PDB medium exposed that Chaetomium globosum
produced a large amount of laccase after 12 days of fermentation, reaching 550 U / L in
Erlens and 987U / L in 20 L fermenter, while Trametes versicolor secretes after 8 days of
fermentation 1400 U / L of laccasic activity in Erlens and 833U / L in fermenter (20L).
Furthermore, the laccase activity secreted by Trametes versicolor has been shown to be at its
maximum at pH 3 and at 55 ° C., whereas the enzymatic activity produced by Chaetomium
globosum reaches its maximum at 35 ° C. and at pH between 5 and 6.
The partial characterization of laccase performed on a Native page gel revealed two different
isozymes produced by Trametes versicolor (Lac1 and Lac2) and a single isozyme produced
by Chaetomium globosum.
The study of laccase production using waste media showed the ability of Trametes versicolor
and Chaetomium globosum to produce laccase on all media tested, however, the optimum of
laccase produced by Trametes versicolor (350U / L) and by Chaetomium globosum (400 U /
L) is obtained on pumpkin waste medium. According to the literature consulted, this work
is the first to use these two fungal strains for the production of laccase using only the
pumpkin waste as the exclusive source of carbon.
The study of synthetic dyes degradation carried out on solid medium and on submerged
medium, demonstrated that selective strains degrade two dyes effectively: Malachite Green
and Congo Red. Degradation was followed by spectrophotometric analysis and HPLC. It was
found that 100% decolorization of Congo Red by Trametes versicolor’s laccase was complete
after 45 minutes of reaction and Malachite green after 60 minutes. On the other hand, the
laccasic extract from Chaetomium globosum allowed a 100% discoloration of Malachite
Green and Congo Red after 55 minutes of reaction. This result can be promising, and
considerable progress in the field of biotechnological applications.
The literature consulted did not mention the ability of Chaetomium species to degrade
Malachite Green or Congo Red. As a result, this work is considered original.Diplôme : Doctorat En ligne : ../theses/biologie/BEN7062.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10539 Etude de la Laccase produite par des Mycètes isolés à partir de différents ecosystèmes Algériens [texte imprimé] / Sara Benhassine, Auteur ; Noreddine Kacem Chaouche, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 104 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : ???? ????? ??????? ???? ??????? ???? ???????
Laccase Trichoderma longibrachiatum Trametes versicolor Chaetomium
globosum pumpkin waste Malachite Green Congo Red déchets de citrouille Vert de Malachite Rouge CongoIndex. décimale : 570 Sciences de la vie. Biologie Résumé : 1 fungal isolates were isolated from forests in eastern Algeria (Kenouaâ, Belezma and
Chettaba), three of them showed positive laccase activity. The morphological and molecular
study carried out allowed identifying them as Trichoderma longibrachiatum, Trametes
versicolor and Chaetomium globosum.
The production kinetics of laccase on PDB medium exposed that Chaetomium globosum
produced a large amount of laccase after 12 days of fermentation, reaching 550 U / L in
Erlens and 987U / L in 20 L fermenter, while Trametes versicolor secretes after 8 days of
fermentation 1400 U / L of laccasic activity in Erlens and 833U / L in fermenter (20L).
Furthermore, the laccase activity secreted by Trametes versicolor has been shown to be at its
maximum at pH 3 and at 55 ° C., whereas the enzymatic activity produced by Chaetomium
globosum reaches its maximum at 35 ° C. and at pH between 5 and 6.
The partial characterization of laccase performed on a Native page gel revealed two different
isozymes produced by Trametes versicolor (Lac1 and Lac2) and a single isozyme produced
by Chaetomium globosum.
The study of laccase production using waste media showed the ability of Trametes versicolor
and Chaetomium globosum to produce laccase on all media tested, however, the optimum of
laccase produced by Trametes versicolor (350U / L) and by Chaetomium globosum (400 U /
L) is obtained on pumpkin waste medium. According to the literature consulted, this work
is the first to use these two fungal strains for the production of laccase using only the
pumpkin waste as the exclusive source of carbon.
The study of synthetic dyes degradation carried out on solid medium and on submerged
medium, demonstrated that selective strains degrade two dyes effectively: Malachite Green
and Congo Red. Degradation was followed by spectrophotometric analysis and HPLC. It was
found that 100% decolorization of Congo Red by Trametes versicolor’s laccase was complete
after 45 minutes of reaction and Malachite green after 60 minutes. On the other hand, the
laccasic extract from Chaetomium globosum allowed a 100% discoloration of Malachite
Green and Congo Red after 55 minutes of reaction. This result can be promising, and
considerable progress in the field of biotechnological applications.
The literature consulted did not mention the ability of Chaetomium species to degrade
Malachite Green or Congo Red. As a result, this work is considered original.Diplôme : Doctorat En ligne : ../theses/biologie/BEN7062.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10539 Exemplaires
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