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Partager le résultat de cette recherche Interroger des sources externesContribution à l’élimination de colorants (Vert de méthyle et Bromocrésol pourpre) par procédés photochimiques en phase homogène (séparés et mélangés), en phase hétérogène en milieu aqueux et par adsorption (Vert de méthyle) sur ZnO. / Ibtissem Bousnoubra
Titre : Contribution à l’élimination de colorants (Vert de méthyle et Bromocrésol pourpre) par procédés photochimiques en phase homogène (séparés et mélangés), en phase hétérogène en milieu aqueux et par adsorption (Vert de méthyle) sur ZnO. Type de document : texte imprimé Auteurs : Ibtissem Bousnoubra, Auteur ; Kamel Djebbar, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 209 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Photodégradation Procédés d’oxydation Avancés Photocatalyse Vert de méthyle Bromocrésol pourpre Photodegradation Advanced oxidation Processes photocatalysis Méthyle green Bromocresol purple ???? ???? ?????? ??????? ???????? ????????????? ???? ?????? ?????? ???????????? Index. décimale : 540 Chimie et sciences connexes Résumé : The study was aimed to study and to compare efficiences of photochemical processes (direct photolysis and advanced oxidation processes POAs) in the degradation of two dyes: the méthyle green and purple Bromocresol. These experiments have occurred in homogeneous phase where the two dyes were studied separately, in a binary mixture and in heterogeneous phase by using ZnO / UV and TiO2 (PC500) / UV.
In Direct photolysis (365 nm and solar light), the elimination yields is weak, mainly,in rtificial light. However and at 254 nm, the BCP only conducts to good results comparatively to these of MG. In another part, a total decolorization of both substrates is obtained by using a
photosensitizer: acetone (10-1 mol. L-1).
In photooxidation (H2O2/UV et S2O8-2/UV), this process was much efficient due to the participation of radicals •OH and SO4•-, this work was undertaken by taking into account the
sensitivity of both dyes in presence of H2O2 and S2O8-2 in absence of light where we observe an insensitivity of BCP towards H2O2 but a sensitivity of MG for H2O2> 10-5M. In this
research, other processes have led also to a good elimination like Fe2+/ H2O2/ UV (254 nm) and Fe3+/ H2O2/
UV (254 nm). The results obtained with these systems, were much more probants comparatively
with Fenton and Like-Fenton. For the binary system, it was observed in one part that the
decolorization of the dye decreases with the addition of the second dye and in another part that
the process acetone/UV is the best system comparatively to direct photolysis UV and H2O2 / UV.
Besides, no change in the kinetics models is observed in the binary system.
In photocatalysis, the elimination of MG and BCP was total with ZnO/UV and TiO2
(PC500)/UV where this one is related directly to radical •OH. Studies were also conducted in
sunlight and demonstrate the superiority of this latter comparatively to the artificial light (99,
74% in 60 minutes for MG and 100% in 120 minutes for BCP). The Langmuir Hinshelwood model describes correctly this process. It should be mentioned that in absence of light, MG showed a better adsorption capacity than BCP where it reached 92% in 180 minutes. The monitoring function of the DCO elimination showed that it depends to the organic matter and decreases over time.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU7006.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10382 Contribution à l’élimination de colorants (Vert de méthyle et Bromocrésol pourpre) par procédés photochimiques en phase homogène (séparés et mélangés), en phase hétérogène en milieu aqueux et par adsorption (Vert de méthyle) sur ZnO. [texte imprimé] / Ibtissem Bousnoubra, Auteur ; Kamel Djebbar, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 209 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Photodégradation Procédés d’oxydation Avancés Photocatalyse Vert de méthyle Bromocrésol pourpre Photodegradation Advanced oxidation Processes photocatalysis Méthyle green Bromocresol purple ???? ???? ?????? ??????? ???????? ????????????? ???? ?????? ?????? ???????????? Index. décimale : 540 Chimie et sciences connexes Résumé : The study was aimed to study and to compare efficiences of photochemical processes (direct photolysis and advanced oxidation processes POAs) in the degradation of two dyes: the méthyle green and purple Bromocresol. These experiments have occurred in homogeneous phase where the two dyes were studied separately, in a binary mixture and in heterogeneous phase by using ZnO / UV and TiO2 (PC500) / UV.
In Direct photolysis (365 nm and solar light), the elimination yields is weak, mainly,in rtificial light. However and at 254 nm, the BCP only conducts to good results comparatively to these of MG. In another part, a total decolorization of both substrates is obtained by using a
photosensitizer: acetone (10-1 mol. L-1).
In photooxidation (H2O2/UV et S2O8-2/UV), this process was much efficient due to the participation of radicals •OH and SO4•-, this work was undertaken by taking into account the
sensitivity of both dyes in presence of H2O2 and S2O8-2 in absence of light where we observe an insensitivity of BCP towards H2O2 but a sensitivity of MG for H2O2> 10-5M. In this
research, other processes have led also to a good elimination like Fe2+/ H2O2/ UV (254 nm) and Fe3+/ H2O2/
UV (254 nm). The results obtained with these systems, were much more probants comparatively
with Fenton and Like-Fenton. For the binary system, it was observed in one part that the
decolorization of the dye decreases with the addition of the second dye and in another part that
the process acetone/UV is the best system comparatively to direct photolysis UV and H2O2 / UV.
Besides, no change in the kinetics models is observed in the binary system.
In photocatalysis, the elimination of MG and BCP was total with ZnO/UV and TiO2
(PC500)/UV where this one is related directly to radical •OH. Studies were also conducted in
sunlight and demonstrate the superiority of this latter comparatively to the artificial light (99,
74% in 60 minutes for MG and 100% in 120 minutes for BCP). The Langmuir Hinshelwood model describes correctly this process. It should be mentioned that in absence of light, MG showed a better adsorption capacity than BCP where it reached 92% in 180 minutes. The monitoring function of the DCO elimination showed that it depends to the organic matter and decreases over time.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU7006.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10382 Exemplaires
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Titre : Etude de l’élimination de deux colorants (Cristal violet et Jaune d’alizarine) par des procédés photochimiques en milieu homogène (lumière artificielle et solaire) et en milieu hétérogène (TiO2/UV et ZnO/UV) : Cas de la transformation photocatalytique du Jaune d’alizarine sur un support transformé : ZnO-Bi2O3/UV Type de document : texte imprimé Auteurs : Sihem Aliouche, Auteur ; Kamel Ezzine Djebbar, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 190 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Dye Photodegradation advanced oxidation processes Photocatalysis semiconductor ???? ?????? ?????? ??? ??????? ???????? ??????? ?????? ???????? Colorant Photodégradation procédés d’oxydation avancés Photocatalyse semiconducteur Index. décimale : 540 Chimie et sciences connexes Résumé : This study is focused in the application of different advanced oxidation processes in a
homogeneous and heterogeneous phase for the treatment of two dyes: the AY and the CV.
The direct photolysis of dyes by the artificial light (254nm and 365nm) and solar light is slow
and can be accelerated by increasing of intensity of photon flux incident, or by adding a
photosensitizer such as acetone at high concentration.
In the case of the two dyes studied, it has been shown that the rate of decolorization by the
AOPs in a homogeneous medium such as H2O2/UV, S2O82-/UV and H2O2/S2O82-/UV, has been
substantially improved compared to that obtained by UV photolysis and that the rate depends on
the experimental parameters such as: concentration of substrate, concentration of catalyst and pH
of medium. This improvement could be related to the production of HO• and SO4•- radicals.
Regarding the system UV/S2O82-/H2O2, we have observed that efficiency decreased slightly
due to a competition effect. On the other hand, the persulfate can generate sulfates radicals ions
by heat activation in absence of light. The degradation of the two dyes has been more effective in
Photo-Fenton and Photo-like-Fenton system than in the Fenton and Fenton-like systems
respectively where the performances of these systems could be optimised by variation of the
experimental parameters such as the pH, the [H2O2]/ [Fe2+] and the [H2O2]/ [Fe3+] ratio. In the
(Fe2+/ S2O82-) and the (UV/Fe2+/S2O82-) system, the persulfate acts on the JA similarly to H2O2
compared to the Fenton and Photo-Fenton processes.
In heterogeneous photocatalysis, the degradation of the JA and the CV has been studied using
different semiconductors (TiO2, ZnO, ZnOpure-Bi2O3). The photocatalysis study of the two dyes
by the TiO2 process (Degussa P25)/UV and ZnO/UV has been presented after overseeing a low
adsorption until saturation (30 minutes). Photocatalysis is influenced by various factors where
this process is improved by the addition of H2O2 but has been inhibited by certain inorganic
anions and alcohols. TiO2-P25 is more efficient than Tiona photocatalysts. In addition, the
Langmuir-Hinshelwood model has adequately described this process. The follow up by the
Chemical Oxygen Demand (DCO), confirms that the photocatalysis process leads to the decrease
of the organic matter content until mineralization of pollutants. Tests in natural radiation showed
a faster degradation of bith pollutant. The ZnO pure-Bi2O3/UV process is more efficient than the
two ZnO commercial/UV and ZnO pur/UV processes in terms of degradation.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/ALI7106.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10495 Etude de l’élimination de deux colorants (Cristal violet et Jaune d’alizarine) par des procédés photochimiques en milieu homogène (lumière artificielle et solaire) et en milieu hétérogène (TiO2/UV et ZnO/UV) : Cas de la transformation photocatalytique du Jaune d’alizarine sur un support transformé : ZnO-Bi2O3/UV [texte imprimé] / Sihem Aliouche, Auteur ; Kamel Ezzine Djebbar, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 190 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Dye Photodegradation advanced oxidation processes Photocatalysis semiconductor ???? ?????? ?????? ??? ??????? ???????? ??????? ?????? ???????? Colorant Photodégradation procédés d’oxydation avancés Photocatalyse semiconducteur Index. décimale : 540 Chimie et sciences connexes Résumé : This study is focused in the application of different advanced oxidation processes in a
homogeneous and heterogeneous phase for the treatment of two dyes: the AY and the CV.
The direct photolysis of dyes by the artificial light (254nm and 365nm) and solar light is slow
and can be accelerated by increasing of intensity of photon flux incident, or by adding a
photosensitizer such as acetone at high concentration.
In the case of the two dyes studied, it has been shown that the rate of decolorization by the
AOPs in a homogeneous medium such as H2O2/UV, S2O82-/UV and H2O2/S2O82-/UV, has been
substantially improved compared to that obtained by UV photolysis and that the rate depends on
the experimental parameters such as: concentration of substrate, concentration of catalyst and pH
of medium. This improvement could be related to the production of HO• and SO4•- radicals.
Regarding the system UV/S2O82-/H2O2, we have observed that efficiency decreased slightly
due to a competition effect. On the other hand, the persulfate can generate sulfates radicals ions
by heat activation in absence of light. The degradation of the two dyes has been more effective in
Photo-Fenton and Photo-like-Fenton system than in the Fenton and Fenton-like systems
respectively where the performances of these systems could be optimised by variation of the
experimental parameters such as the pH, the [H2O2]/ [Fe2+] and the [H2O2]/ [Fe3+] ratio. In the
(Fe2+/ S2O82-) and the (UV/Fe2+/S2O82-) system, the persulfate acts on the JA similarly to H2O2
compared to the Fenton and Photo-Fenton processes.
In heterogeneous photocatalysis, the degradation of the JA and the CV has been studied using
different semiconductors (TiO2, ZnO, ZnOpure-Bi2O3). The photocatalysis study of the two dyes
by the TiO2 process (Degussa P25)/UV and ZnO/UV has been presented after overseeing a low
adsorption until saturation (30 minutes). Photocatalysis is influenced by various factors where
this process is improved by the addition of H2O2 but has been inhibited by certain inorganic
anions and alcohols. TiO2-P25 is more efficient than Tiona photocatalysts. In addition, the
Langmuir-Hinshelwood model has adequately described this process. The follow up by the
Chemical Oxygen Demand (DCO), confirms that the photocatalysis process leads to the decrease
of the organic matter content until mineralization of pollutants. Tests in natural radiation showed
a faster degradation of bith pollutant. The ZnO pure-Bi2O3/UV process is more efficient than the
two ZnO commercial/UV and ZnO pur/UV processes in terms of degradation.Diplôme : Doctorat en sciences En ligne : ../theses/chimie/ALI7106.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10495 Exemplaires
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Titre : Photodégradation du chlorure de 1-hexyl-3- methylimidazolium en milieu aqueux homogène et hétérogène. Type de document : texte imprimé Auteurs : Ameur Boutiti, Auteur ; Razika Zouaghi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 123 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Photodégradation Liquide ionique Procédé d’Oxydation Avancée H2O2/UV S2O82–/UV TiO2/UV Photodegradation Ionic liquid Advanced Oxidation Processes ????? ?????? ?????? ??????? ??? ??????? Index. décimale : 540 Chimie et sciences connexes Résumé : 1-hexyl-3-methylimidazolium chloride (HMImCl) removal from aqueous solution has been achieved by different advanced oxidation processes (AOPs).
HMImCl direct photolysis at 254 nm showed that oxygen mainly intervenes to give O2–·, it can then react with water to form hydrogen peroxide, capable to photolyze and lead to the formation of radicals HO•. On the other hand, singlet oxygen does not participate in the oxidation reaction.
HMImCl degradation rate is appreciably increased by combining the strong oxidant H2O2 with UV light. The H2O2/UV process efficiency is enhanced by increasing H2O2 concentration up to a limit value imposed by self-quenching reactions. High alkalinity favors the disappearance while current inorganic anions chlorides, in acidic medium, inhibit it. Very similar results are obtained with S2O82-/UV process with, in particular, a rate that increases up to a limiting value of the oxidant concentration.
The reaction rate constants of the hydroxyl radicals determined for the two ionic liquids studied, transcribe the high reactivity and the speed of reaction of hydroxyl radicals on ionic liquid. The reaction rate constant of hydroxyl radicals on HMImCl is the same whatever the concentration of HMImCl Heterogeneous photocatalysis on TiO2 proved to be efficient to degrade HMImCl. The process is further improved by H2O2 or S2O82- addition up to an optimum but inhibited by anion chloride in acidic medium. The process is adequately described by the LangmuirHinshelwood kinetic model.
Selective heterogeneous photocatalysis of HMImCl in presence of benzoic acid has demonstrated that benzoic acid affect HMImCl’s degradation. A good selectivity was obtained in acidic medium, where only benzoic acid has been degraded.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU7188.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10750 Photodégradation du chlorure de 1-hexyl-3- methylimidazolium en milieu aqueux homogène et hétérogène. [texte imprimé] / Ameur Boutiti, Auteur ; Razika Zouaghi, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 123 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Photodégradation Liquide ionique Procédé d’Oxydation Avancée H2O2/UV S2O82–/UV TiO2/UV Photodegradation Ionic liquid Advanced Oxidation Processes ????? ?????? ?????? ??????? ??? ??????? Index. décimale : 540 Chimie et sciences connexes Résumé : 1-hexyl-3-methylimidazolium chloride (HMImCl) removal from aqueous solution has been achieved by different advanced oxidation processes (AOPs).
HMImCl direct photolysis at 254 nm showed that oxygen mainly intervenes to give O2–·, it can then react with water to form hydrogen peroxide, capable to photolyze and lead to the formation of radicals HO•. On the other hand, singlet oxygen does not participate in the oxidation reaction.
HMImCl degradation rate is appreciably increased by combining the strong oxidant H2O2 with UV light. The H2O2/UV process efficiency is enhanced by increasing H2O2 concentration up to a limit value imposed by self-quenching reactions. High alkalinity favors the disappearance while current inorganic anions chlorides, in acidic medium, inhibit it. Very similar results are obtained with S2O82-/UV process with, in particular, a rate that increases up to a limiting value of the oxidant concentration.
The reaction rate constants of the hydroxyl radicals determined for the two ionic liquids studied, transcribe the high reactivity and the speed of reaction of hydroxyl radicals on ionic liquid. The reaction rate constant of hydroxyl radicals on HMImCl is the same whatever the concentration of HMImCl Heterogeneous photocatalysis on TiO2 proved to be efficient to degrade HMImCl. The process is further improved by H2O2 or S2O82- addition up to an optimum but inhibited by anion chloride in acidic medium. The process is adequately described by the LangmuirHinshelwood kinetic model.
Selective heterogeneous photocatalysis of HMImCl in presence of benzoic acid has demonstrated that benzoic acid affect HMImCl’s degradation. A good selectivity was obtained in acidic medium, where only benzoic acid has been degraded.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/BOU7188.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10750 Exemplaires
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Titre : Elimination de deux polluants organiques par photo-induction en phase homogène et hétérogène et par adsorption sur des supports inorganiques locaux. Type de document : texte imprimé Auteurs : Badis Khennaoui, Auteur ; Moulay Abderrahmane Malouki, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 164 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles. Langues : Français (fre) Tags : Processus avancés d'oxydation Photo-Fenton hétérogène Photodégradation Polluants Photocatalyseur Advanced oxidation processes heterogeneous Photo-Fenton Photodegradation Pollutants Photocatalyst ????? ??????? ???????? ????-????? ??? ??????? ?????? ?????? ???????? ??????? ?????? Index. décimale : 540 Chimie et sciences connexes Résumé : This work aims to study and evaluate the efficiency of a photo- catalytic process photoFenton-type for the removal from aqueous medium of an azo dye (orange methyl) and a pesticide (linuron) belonging to phenylurea family. It was for objective to study (or to investigate) the photocatalytic activity of a local clay rich in iron oxide for the degradation of certain kind of organic compounds, in particular dyes and pesticides.
The first part of this work has been devoted to the acquisition of some local clay and the obtaining of their characteristic properties by a few characterization methods such as: thermal analysis (ATD and ATG), scanning electron microscope, X-ray diffraction, UV-visible spectroscopy and X-ray fluorescence.
The adsorption kinetics of two pollutants showed that the equilibrium is reached practically in 30 minutes. The adsorption rate was rapid at the first 15 minutes of the process and then becomes slow for the rest of stirring time to reach equilibrium after 30 minutes.
The photo-degradation process of heterogeneous photo-Fenton type (clay/pollutant/oxalic acid/UV system) was studied by monitoring the change in the concentration of organic pollutants using the UV-Vis spectroscopic analysis technique as a function of irradiation time.
The degradation was studied by investigating the effect of different operational parameters such as: the initial pH, the concentration of the catalyst and the concentration of organic materials.
The results indicated that the photodegradation rate of two pollutants was clearly increased in the presence of clay compared with the direct photolysis. The introduction of oxalic acid considerably improved the photocatalytic process (about 90% removal). The optimal conditions for a better degradation were obtained for: [clay] = 1 g/L and acidic pH (between 3 and 4) in the presence of [oxalic acid] = 10-2 M.
The exposition of the photocatalytic system to sunlight causes the disappearance the organic pollutant in a significant way. This fact is very promising and highlighting the possibility of using sunlight, a source of renewable and free energy as an alternative to UV radiations for the elimination of organic pollutants from the aquatic environment.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/KHE7205.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10758 Elimination de deux polluants organiques par photo-induction en phase homogène et hétérogène et par adsorption sur des supports inorganiques locaux. [texte imprimé] / Badis Khennaoui, Auteur ; Moulay Abderrahmane Malouki, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 164 f. ; 30 cm.
2 copies imprimées disponibles.
Langues : Français (fre)
Tags : Processus avancés d'oxydation Photo-Fenton hétérogène Photodégradation Polluants Photocatalyseur Advanced oxidation processes heterogeneous Photo-Fenton Photodegradation Pollutants Photocatalyst ????? ??????? ???????? ????-????? ??? ??????? ?????? ?????? ???????? ??????? ?????? Index. décimale : 540 Chimie et sciences connexes Résumé : This work aims to study and evaluate the efficiency of a photo- catalytic process photoFenton-type for the removal from aqueous medium of an azo dye (orange methyl) and a pesticide (linuron) belonging to phenylurea family. It was for objective to study (or to investigate) the photocatalytic activity of a local clay rich in iron oxide for the degradation of certain kind of organic compounds, in particular dyes and pesticides.
The first part of this work has been devoted to the acquisition of some local clay and the obtaining of their characteristic properties by a few characterization methods such as: thermal analysis (ATD and ATG), scanning electron microscope, X-ray diffraction, UV-visible spectroscopy and X-ray fluorescence.
The adsorption kinetics of two pollutants showed that the equilibrium is reached practically in 30 minutes. The adsorption rate was rapid at the first 15 minutes of the process and then becomes slow for the rest of stirring time to reach equilibrium after 30 minutes.
The photo-degradation process of heterogeneous photo-Fenton type (clay/pollutant/oxalic acid/UV system) was studied by monitoring the change in the concentration of organic pollutants using the UV-Vis spectroscopic analysis technique as a function of irradiation time.
The degradation was studied by investigating the effect of different operational parameters such as: the initial pH, the concentration of the catalyst and the concentration of organic materials.
The results indicated that the photodegradation rate of two pollutants was clearly increased in the presence of clay compared with the direct photolysis. The introduction of oxalic acid considerably improved the photocatalytic process (about 90% removal). The optimal conditions for a better degradation were obtained for: [clay] = 1 g/L and acidic pH (between 3 and 4) in the presence of [oxalic acid] = 10-2 M.
The exposition of the photocatalytic system to sunlight causes the disappearance the organic pollutant in a significant way. This fact is very promising and highlighting the possibility of using sunlight, a source of renewable and free energy as an alternative to UV radiations for the elimination of organic pollutants from the aquatic environment.
Diplôme : Doctorat en sciences En ligne : ../theses/chimie/KHE7205.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10758 Exemplaires
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