Dissertations / Theses on the topic 'Fer hydroxyde'
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Drissi, Sidi El Hassane. "Oxydation des espèces du fer en milieu aqueux carbonate : préparation et propriétés thermodynamiques de l'hydroxyde carbonate Fe2+-Fe3+ en milieu aqueux (rouille verte 1 carbonatée) et sa formation directe à partir du fer métallique." Nancy 1, 1995. http://www.theses.fr/1995NAN10349.
Full textTrolard, Fabienne. "Physicochimie des cuirasses latéritiques : domaines de stabilité des oxydes et hydroxydes de fer et d'aluminium." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13268.
Full textWang, Yuheng. "Etude cristallochimique de l'immobilisation de l'arsenic par les (hydr)oxydes de fer dans les environnements anoxiques." Paris 6, 2007. http://www.theses.fr/2007PA066384.
Full textAyadi, Sondra. "Nouveaux nanomatériaux hybrides métal/hydroxyde de fer. Synthèse, caractérisation et application à la catalyse chimique et électrochimique." Thesis, Evry-Val d'Essonne, 2015. http://www.theses.fr/2015EVRY0011/document.
Full textWe developed simple, fast and "green" synthesis of new nanohybrids, composed of metal nanoparticles supported on inorganic matrix of iron hydroxide. Their synthesis in suspension involves first, the formation of the FeII-bearing inorganic solid matrix, then the reaction with metal salt solution, in the same reactor. Three inorganic matrices (carbonated or sulfated green rusts (GRc or GRs) and chukanovite Chu) and three metals (Au, Ag and Pt) were studied. The nanohybrids, noted metal-exMatrix, were characterized by XRD, FTIR, SEM, TEM and voltammetry. The matrix acts as a reducing agent supplying electrons by solid state oxidation, and also as the support of metal nanoparticles. Two reaction mechanisms with intra- or inter-particle electron transfer are proposed. Nanoparticles sizes vary between 20 and 200 nm. The first application involves the building of amperometric H2O2 sensors. Carbon ink electrodes incorporating silver-based nanohybrids, particularly Ag-exRVs, or platinum, Pt-exChu, provide electrochemical catalytic properties, enabling us to quantify the peroxide by its electrochemical response in reduction or oxidation. For the second application, the reduction reaction of 4-nitrophenol by borohydride, we showed that our nanohybrids were more efficient catalysts than the best current materials, with similar metal load and temperature
Rézel, Dominique Roland. "Structure hyperfine et cinétique de formation des composés de corrosion humide du fer en milieu aqueux chloré : Rôle de la rouille verte 1." Nancy 1, 1988. http://www.theses.fr/1988NAN10494.
Full textEchchachoui, Khalid. "Préparation de catalyseurs au fer ou au cuivre pour l'oxydation du phénol en milieu aqueux dilué." Poitiers, 1996. http://www.theses.fr/1996POIT2295.
Full textCombes, Jean-Marie. "Evolution de la structure locale des polymeres et gels ferriques lors de la cristallisation des oxydes de fer : application au piegeage de l'uranium." Paris 6, 1988. http://www.theses.fr/1988PA066163.
Full textDemoisson, Frédéric. "Réactivité aux échelles micronique et submicronique de particules colloïdales : oxydation d'un sulfure de fer (pyrite) par du chrome (VI) et sorption sur un hydroxyde d'aluminium (gibbsite) d'espèces organiques." Nancy 1, 2006. http://docnum.univ-lorraine.fr/public/SCD_T_2006_0004_DEMOISSON.pdf.
Full textTwo systems characterised by oxydoreduction and sorption of surface reactions are studied: the pyrite oxidation (FeS2) by chromium (VI) and the sorption of dinitro-2,4 benzoic species on gibbsite (γ-Al(OH)3). The aim of the first system is to study the pyrite oxidation processes of the pyrite by using chromium (VI) like a metal probe. The solution analysis by UV-visible spectroscopy and the solid phase characterisation by confocal Raman spectrometry, XPS, EXAFS and XANES allow to suggest a mechanism model of oxidation/dissolution. The objective of the second study is to display a specific chemical reactivity between two crystalline face types of the gibbsite by using an organic probe with the help of sub-wavelength spectroscopy (SNOM). Correlations between crystalline faces and near field spectra show difference reactivity between mono and bi coordinated OH groups from the mineral phase. A model of sorption is presented
Mathieu, Catherine. "Élaboration d'un procédé industriel d'élimination de si, al et cr des bains acides de chlorure de fer et étude de l'influence du silicium sur les propriétés magnétiques des ferrites." Nancy 1, 1993. http://www.theses.fr/1993NAN10292.
Full textRamanaïdou, Erick. "Génèse d'un gisement latéritique : évolution supergène des itabirites proterozoïques de la mine de fer de Capanema (Minas Gerais, Brésil)." Poitiers, 1989. http://www.theses.fr/1989POIT2272.
Full textDavranche, Mélanie. "Impacts des processus aux interfaces solide/liquide sur la mobilité des éléments : Observations de terrain-Expérimentation-modélisation." Habilitation à diriger des recherches, Université Rennes 1, 2008. http://tel.archives-ouvertes.fr/tel-00289457.
Full textRefait, Philippe. "La rouille verte 1 chlorée : rôle dans les mécanismes de corrosion du fer en milieu aqueux chlores et chloro-sulfates, dans l'oxydation d'hydroxydes mixtes fer-nickel : sa structure cristallographique." Nancy 1, 1991. http://www.theses.fr/1991NAN10091.
Full textChahboune, Rajae. "Transformation photochimique des sulfonylurées et des organophosphorés sous excitation de complexes aqueux de fer (III) : rôle du fer (II) et du peroxyde d'hydrogène." Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22550/document.
Full textWaste waters resulting from industrial and artisanal activities as well as from hospital discharges contain numerous toxic organic and inorganic contaminants that require efficient treatment. In the present work, we employed various combinations of ferric and ferrous ions, oxygen, hydrogen peroxide and sunlight (Fe(III)/Fe(II)/O2/hν) to induce the transformation of two pesticide families: sulfonylureas and organophosphorus. The main objective of the study was devoted to the role of iron(II) species in the whole transformation process and also to the elucidation of the generated byproducts. In a first step, we used the system H2O2/ hν as a preliminary process for the degradation of the pollutant. This allowed a complete and fast removal of sulfonylureas. The reaction mainly involves hydroxyl radicals that were identified and quantified by nanosecond laser photolysis technique. The process highly depends on the initial substrate concentration, pH and the concentration of the photoinductor (H2O2). The presence of inorganic ions that could be present in waste waters was shown to inhibit the degradation, in the following decreasing order: SO42- > Cl- > NO3- > CO32- . In a second step, the study of the photochemical behavior of the iron(III) aquacomplex, [Fe(H2O)5(OH)]2+, upon light excitation at 365 nm as well as by using a solar simulator also showed the generation of hydroxyl radical together with iron(II) species. A complete elimination of studied pesticides was obtained even at low concentrations of iron(III) complex (1,0x10-6 mol L-1), indicating the high efficiency of the process. To gain insight into the degradation mechanism, the evolution of iron species upon irradiation was investigated in the absence and in the presence of molecular oxygen. The results suggested that a regeneration mechanism of iron(III) occurs through two consecutives steps. First, the excitation of iron(III) in trace concentrations, leads to the formation of iron(II) excited states through energy transfer process followed an electron transfer process that involves molecular oxygen and iron(II) excited state. As a conclusion, the solution becomes more and more enriched by iron(III) via the light excitation and in the presence of oxygen revealing the photocatalytic behavior of [Fe(H2O)5(OH)]2+. Within this work, a special attention was also devoted to the identification of products formed during the above photocatalytic process. This was performed by using liquid chromatography coupled to tandem mass spectrometry LC/ESI/MS2. The close investigation of the fragmentation processes of the generated products, permitted the establishment of precise chemical structures. In addition to the classical degradation of sulfonylureas by hydroxyl radicals (hydroxylation of the aromatic ring, the scission of sulfonylurea bridge and demethylation) a ring opening of the triazine skeleton was also obtained. This was observed under acidic conditions and was clearly confirmed by theoretical studies at the B3LYP / 6-31G (d, p) level. This triazine scission was only obtained with sulfonylures that contain a methoxy group and a secondary amine adjacent to the triazine moiety. Such ring opening constitutes an important and fundamental step when decontamination or/and mineralization of waste waters are concerned
Demougeot, Céline. "Etude de la toxicité cérébrale du fer et évaluation du N-Acétyl-L-aspartate comme marqueur biochimique de la mort neuronale : application à l'ischémie cérébrale." Dijon, 2001. http://www.theses.fr/2001DIJOPE02.
Full textTrolard, Fabienne. "Physicochimie des cuirasses latéritiques domaines de stabilité des oxydes et hydroxydes de fer et d'aluminium /." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb376016635.
Full textLi, Jing. "17beta-estradiol degradation photoinduced by iron complex, clay and iron oxide minerals : effect of the iron complexing agent ethylenediamine-N,N'-disuccinic acid." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2010. http://tel.archives-ouvertes.fr/tel-00719247.
Full textBon, Catherine. "Oxydoréduction de la rouille verte II sulfatée en solution aqueuse." Nancy 1, 1997. http://www.theses.fr/1997NAN10045.
Full textQuienne, Pascale. "Mécanisme de coagulation-floculation de la silice colloi͏̈dale par les hydroxydes de fer : étude par diffusion aux petits angles des rayons X." Orléans, 1989. http://www.theses.fr/1989ORLE2024.
Full textMuller, Pascal. "Gestion des déchets minéraux industriels : de l'inertage à la valorisation matière : application aux effluents et boues d'hydroxydes à base de fer, zinc et nickel." Metz, 1997. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1997/Muller.Pascal.SMZ9721.pdf.
Full textThe treatment process of liquid waste containing heavy metals by metal hydroxyde precipitation is the most commonly employed. At the present time, the sludge are an ultimate waste wich are stored in landfilling. In a first time, the objective is the inertizing of heavy metal like zinc. The principle of transformation of leaching forms containing heavy metal in metallic sulfides slightly soluble appears like a way to explore. The present work confirms that a sulfurization of mineralogic form of zinc containing in sludge is faisable from polysulfides solutions. The performance of this process is confirmed in the case of real sample stemming from industry. In a second time, we studied the possibility of the selective extraction method by leaching of zinc-bearing phases. Chemical leaching of ZnO and Zn(OH)2 with a solution of inorganic ligand as thiosulphate and organic ligand such as polyethylene-polyamine appeared to be an efficient method. This detoxication method has been validated using these reagents on the real hydroxyde sludge stemming from industry. The result confirms that this treatment led to the extraction of the potential polluting zinc fraction contained in the waste. The last method studied the possibility of selective precipitation of heavy metal contained in liquid waste before classical physicochemical treatment. The reducing power of polysulfides and the formation possibility of metallic sulfides slighthly soluble bring about the selective precipitation of zinc sulfide and nickel in mixte solution of fer-zinc-nickel. The treatment of liquid waste containing heavy metal is possible. The final-products are a sulfur-metallic sulfur heavy metal mixture and an hydroxie ferric cake. The use of this products as new materials in different industries is actually under study
Francke, Loïc. "Préparation et caractérisation d'hydroxy-et d'oxyhydroxyfluorures d'aluminium, de fer ou de chrome : corrélation entre la composition / structure, la stabilité thermique et les propriétés acides." Bordeaux 1, 2002. http://www.theses.fr/2002BOR12567.
Full textMaestre, Philippe. "Métaux redox (cuivre, fer) et production de radicaux hydroxyles. Application à la cytotoxicité des quinones." Toulouse 3, 1991. http://www.theses.fr/1991TOU30211.
Full textKolar, Michal. "Degradation of organic pollutants employing various photocatalytic systems." Clermont-Ferrand 2, 2008. http://www.theses.fr/2008CLF21885.
Full textGreffie, Catherine. "Contribution à la connaissance du comportement de l'or en milieu latéritique : étude expérimentale des mécanismes de coprécipitation de l'or et des oxy-hydroxydes de fer." Aix-Marseille 3, 1994. http://www.theses.fr/1994AIX30022.
Full textChevrier, Vincent. "Approche magnétique de la formation du régolithe martien : étude sur analogues terrestres et expérimentaux." Aix-Marseille 3, 2004. http://www.theses.fr/2004AIX30061.
Full textResults of Martian spacecraft missions have evidenced the presence of a strongly altered regolith, of which possible origin is alteration of primary basaltic substrate by atmosphere and hydrosphere. This hypothesis of weathering is tested on a terrestrial analogue: the Ferrar dolerite from Antarctic and on some phases experimentally altered in a simulated Martian atmosphere. Meteoric weathering under Martian conditions produces strongly magnetic phases, either inherited from parent bedrock (titanomagnetite), either from exogenic contribution (iron metal), or neoformed (maghemite). Red ferric (oxy)hydroxides (goethite and hematite) as well as most secondary phases detected in the Martian regolith, i. E. Sulfates and carbonates, may also result from weathering. Finally this study demonstrates that weathering may occur in the absence of O2. Water is then the main reactive species, responsible for oxidation reactions of the surface
Géhin, Antoine. "Etude de la coprécipitation des cations FeII et FeIII en milieu sulfaté : influence des ions phosphate et carbonate." Nancy 1, 2002. http://www.theses.fr/2002NAN10148.
Full textThe coprecipitation of the ferrous FeII and ferric cations FeIII is studied in sulphated medium. The follows of the potential and the pH during the coprecipitations are coupled with the characterisation of the solid phases by X-rays diffraction and Mössbauer spectroscopy. The solid phases present during the coprecipitation are ferrous hydroxide Fe(OH)2, sulphated green rust FeII4 FeIII2 (OH)12 SO4 · 8H2O, magnetite Fe3O4, the gœthite a-FeOOH and a ferric basic salt. A stœchiometric diagram of the solid compounds was plotted, and it becomes the appropriate tool of this study. We also studied influence of phosphate and carbonate anions on the coprecipitation. The carbonate ions replace the sulphate ions, in order to form the carbonate green rust FeII4 FeIII2 (OH)12 CO3 · 2H2O. In addition, in anoxic conditions, this green rust is transformed into a mixture of ferrous hydroxide and magnetite. We showed that phosphate ions stabilise carbonated green rust, by adsorption on the side faces of the crystallites
Demourgues-Guerlou, Liliane. "Sur de nouveaux hydroxydes et oxydroxydes de nickel substitués au fer et au manganèse pour batteries nickel-cadmium ou nickel-hydrure métallique." Bordeaux 1, 1992. http://www.theses.fr/1992BOR10670.
Full textPons, Tony. "Caractérisation des oxy-hydroxydes de fer et des éléments associés (S, Se, As, Mo, V, Zr) dans les environnements redox favorables aux gisements d’uranium." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112197/document.
Full textThis work presents a multi-scale and a multi-technical study for the characterization of iron oxi-hydroxides in three uranium-type deposits and host rock. The choice of sites has focused on a roll front deposit: Zoovch Ovoo in a Cretaceous basin of East Gobi (Mongolia); a tectonic-lithological type: Akola/Ebba in Tim Mersoï basin (Niger) and a Proterozoic unconformity type: Kiggavik in Thelon basin (Canada). A new approach has been implemented to characterize the iron oxi-hydroxides on macroscopic samples: field infrared spectroscopy using the ASD TerraSpec® spectrometer. From the original indexes calculated on the spectra, it was possible both to characterize the iron oxi-hydroxides; only hematite and goethite were identified in the different parts of oxidized uranium fronts, and visualize the alteration zonation along the redox front. In addition, the visible part of spectrum was used to quantify the color of samples through the IHS system parameters (Intensity – Hue – Saturation) and the Munsell system. The color setting of the study identified a specific hue for mineralized samples studied: a mixture of yellow and red (2.5 to 10YR in Munsell notation). At the crystals scale, the iron-hydroxides were characterized by µ-Raman spectroscopy. The study highlighted a difference in crystallinity of hematite crystals in different fields. From a morphological point of view, the crystals of goethite in the Zoovch Ovoo deposit, is only authigenic iron oxi-hydroxides described in this uranium front, are twinned in the form of six-pointed star, reflecting a low crystallization temperature, compared to Niger and Kiggavik deposits. This crystallization is mainly controlled by the availability of Feᴵᴵᴵ ions in the fluid, released by pyrite dissolution in an oxidizing environment and pH. From a chemical point of view, iron oxi-hydroxides record the fluid passage owing their uranium content. Secondly, the composition in trace elements marks the type of deposit, for example zirconium content in oxi-hydroxides from Niger deposit, volcanic source. This typical mobility of zirconium is particularly expressed in the uranium front in Ebba deposit by the precipitation of authigenic crystals of zircon contemporary of pitchblende. The mineralogical and geochemical data obtained in this work on the Zoovch Ovoo deposit (Mongolia) allow us to propose an original model for its formation: uranium did not precipitate massively in upstream edge of front, because not radiation halo is visible in cathodoluminescence in detrital minerals in the oxidized area. Uranium precipitated when the oxidizing water met with sedimentary facies having a fairly strong reducing power to allow uranium reduction. The precipitation occurs in a particular location of the formation: paleo-lake where organic matter and pyrite are abundant
Majesté, Labourdenne Annie. "Etude de la réactivité et de la nature des espèces actives dans l'oxydation en milieu aqueux du phénol par le peroxyde d'hydrogène, en présence de catalyseurs à base de fer déposé sur support carboné." Poitiers, 2000. http://www.theses.fr/2000POIT2296.
Full textKolář, Michal. "Degradation of organic pollutants employing various photocatalytic systems." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2008. http://tel.archives-ouvertes.fr/tel-00731166.
Full textGallard, Hervé. "Modélisation cinétique de la décomposition de H2O2 et de composés organiques en milieu aqueux par les procédés d'oxydation H2O2/Fe(II) et H2O2/Fe(III)." Poitiers, 1998. http://www.theses.fr/1998POIT2299.
Full textLeoni, Nadine. "Amélioration du traitement de clarification. Contribution à l'étude des mécanismes de coagulation d'eaux douces et peu turbides par le fer(III) et d'un procédé de floculation lestée." Toulouse, INPT, 1996. http://www.theses.fr/1996INPT036G.
Full textOlowe, A. Abiodun. "Corrosion aqueuse du fer en milieux sulfates : Mécanisme, cinétique et structures." Nancy 1, 1988. http://www.theses.fr/1988NAN10297.
Full textLenoble, Véronique. "Elimination de l'Arsenic pour la production d'eau potable :oxydation chimique et adsorption sur des substrats solides innovants." Phd thesis, Université de Limoges, 2003. http://tel.archives-ouvertes.fr/tel-00105947.
Full text(agriculture, extraction et exploitation de minerais principalement) ont conduit à son accumulation dans l'environnement.
L'abaissement à 10 µg/L de la limite de qualité pour l'arsenic dans l'eau de consommation pose la question de l'efficacité des
traitements existants. De nouvelles techniques plus performantes d'élimination de l'arsenic sont donc de plus en plus
nécessaires. L'objectif de ce travail est de développer de nouvelles méthodes d'analyses de l'arsenic, fiables et utilisables sur le
terrain, ainsi que des méthodes simples d'élimination de l'arsenic, de mise en œuvre facile et applicables à de petites unités de
traitement comme celles rencontrées en zones à habitat dispersé (débit < 10 m3/h).
L'adsorption de As(III) et As(V), méthode répondant aux critères précédemment définis, a été étudiée. Tout d'abord des
supports classiques ont été considérés : des (oxy)hydroxydes de fer; puis des supports innovants : des argiles pontées dérivées
d'une montmorillonite. Celle-ci a été modifiée par différents polycations (fer, titane et aluminium) de façon à créer des sites
favorables à l'adsorption. L'adsorption a été réalisée selon différentes conditions, et dans des milieux plus ou moins complexes.
Il s'avère que les (oxy)hydroxydes de fer fixent plus d'arsenic que les argiles pontées, tant sous la forme As(III) que As(V).
Néanmoins, l'étude de la désorption a montré que l'argile pontée au fer était le seul support régénérable quasiment à 100%.
Connaissant les différences de comportement selon la nature des espèces de l'arsenic inorganique As(III) et As(V), l'oxydation
de As(III) par différents oxydants usuels a été l'objet d'une partie de l'étude. Les oxydants testés sont H2O2, NaOCl, FeCl3,
KMnO4 et MnO2(s), couramment employés dans les traitements. De façon à quantifier la capacité oxydante de ces réactifs, une
méthode colorimétrique a été développée. Celle-ci, facilement transposable sur le terrain, peut être appliquée aux eaux peu
chargées en phosphate avec une limite de quantification de 20 µg As/L. Il s'avère que les oxydants les plus facilement
utilisables dans une unité de potabilisation sont KMnO4 et FeCl3. A la suite de cette étude, un support à base d'une résine de
polystyrène recouverte d'oxyde de manganèse a été synthétisé. Ce solide combine des propriétés d'oxydation et d'adsorption
simultanées. Les capacités d'adsorption de ce solide vis-à-vis de As(V) et de As(III) sont remarquables et supérieures à une
majorité des adsorbants étudiés récemment.
La dernière partie a consisté en l'étude de la faisabilité des procédés mis au point sur un milieu plus proche des conditions
naturelles. Pour cela, une eau artificielle représentative des eaux de type granitique, habituellement concernées par la pollution
arséniée, a été préparée à partir de la compilation des compositions d'eaux souterraines destinées à la production d'eau potable.
Ainsi, les concentrations en ions majeurs communes à ces eaux ont pu être déterminées. Cette eau artificielle a ensuite été
utilisée après dopage en As(III) et As(V) dans diverses expériences d'oxydation et d'adsorption de façon à appréhender les
mécanismes mis en jeu dans le milieu naturel. Il apparaît que les ions majeurs ont peu d'influence sur ces procédés, démontrant
leur applicabilité au sein d'une filière de traitement.
Özcan, Ali. "Degradation of hazardous organic compounds by using electro-fenton technology." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00601213.
Full textDuc, Myriam. "Contribution à l'étude des mécanismes de sorption aux interfaces solide-liquide : application aux cas des apatites et des oxy-hydroxydes." Phd thesis, Ecole Centrale Paris, 2002. http://tel.archives-ouvertes.fr/tel-00012139.
Full textBeaujolais, Virginie. "Cavités moléculaires chirales à groupements hydroxyles convergents : synthèses et étude de complexation." Université Joseph Fourier (Grenoble), 1996. http://www.theses.fr/1996GRE10148.
Full textDillenseger, Christine. "Modelisation experimentale de la dissolution des oxy-hydroxydes d'aluminium et de fer dans une solution 5 m naoh, a 200 et 250c : application au procede bayer de traitement de la bauxite." Orléans, 1995. http://www.theses.fr/1995ORLE2068.
Full textBensalem, Hadia. "Implication des radicaux libres dans le cancer et la pathologie bilharzienne : exploitation des propriétés anti-radiculaires de l'hydrogène moléculaire." Aix-Marseille 2, 2002. http://theses.univ-amu.fr.lama.univ-amu.fr/2002AIX20657.pdf.
Full textOur work is the first attempt to examine the opportunity to use the radical scavenging properties of gaseous hydrogen for protection against ionizing radiations and in a new anticancerous strategy. Hydrogen reacts with the hydroxyl radical, which is responsible for most of the radiation's damages ; the radical also initiates tumoral proliferation through several mechanisms, especially DNA alteration. We showed that 0. 7 MPa hydrogen reduces by 40 % base alteration in a gamma-irradiated DNA solution. The proportion of oxidized/reduced byproducts is unchanged, showing that hydrogen acts on the hydroxyl radical itself and not on down-stream reactions. Moreover, hydrogen triggers the apoptosis of cancer cell lines which are in active mitosis. Together with previous experiments showing a protective effect of hydrogen towards chronic hepatic inflammation, our findings illustrate the potential therapeutic properties of molecular hydrogen. Compared with all known drugs, hydrogen has the advantage to scavenge the hydroxyl radical without side effects. Ln the second part of our work, we examined the implication of nitric oxide (NO) in the hepatic injury due to the parasite Schistosoma mansoni, in the mouse. We showed that the activity of endothelial NO synthase (eNOS) is dramatically decreased. This is probably due to the nitrosylation/nitration of the enzyme by peroxynitrite, because of the simultaneous production of i) reactive oxygen species and ii) NO by the inducible NO synthase isoform (iNOS). We showed also that the expression and activity of iron regulatory protein-1 (IRP-1) is altered. This is likely to result in a change of the hepatic iron homeostasis. Actually, the disease induces a marked increase of free iron concentration in the liver. These observations should be taken into consideration for the human pathology
Wu, Yanlin. "Application of Fe(III)-EDDS complex in advanced oxidation processes : 4-ter-butylphenol degradation." Thesis, Clermont-Ferrand 2, 2014. http://www.theses.fr/2014CLF22455/document.
Full textAdvanced Oxidation Processes (AOPs) have been proved to be successfully applied in the treatment of sewage. It can decolorize the wastewater, reduce the toxicity of pollutants, convert the pollutants to be a biodegradable by-product and achieve the completed mineralization of the organic pollutants. The Fenton technologies which are performed by iron-activated hydrogen peroxide (H2O2) to produce hydroxyl radical (HO•) has been widely investigated in the past few decades. Recently, Sulfate radical (SO4•-) which was produced by the activation of persulfate (S2O82-) is applied to the degradation of organic pollutants in water and soil. It is a new technology recently developed. It is also believed to be one of the most promising advanced oxidation technologies.In this study, a new iron complex is introduced to the traditional Fenton reaction. The ferric iron (Fe(III)) and Ethylene diamine-N,N′-disuccinic acid (EDDS) formed the complex named Fe(III)-EDDS. It can overcome the main disadvantage of traditional Fenton technology, which is the fact that traditional Fenton technology can only perform high efficiency in acidic condition. Simultaneously, EDDS is biodegradable and it is one of the best environment-friendly complexing agents. On the other hand, the transition metal is able to activate S2O82- to generate SO4•-. Therefore, Fe(III)-EDDS will also be applied to activate S2O82- in the present study. 4-tert-Butylphenol (4-t-BP) has been chosen as a target pollutant in this study. It is widely used as a chemical raw material and is classified as endocrine disrupting chemicals due to the estrogenic effects. The 4-t-BP degradation rate (R4-t-BP) is used to indicate the efficiency of the advanced oxidation processes which are based on Fe(III)-EDDS utilization. The main contents and conclusions of this research are shown as follows:In the first part, the chemical structure and properties of Fe(III)-EDDS and the 4-t-BP degradation efficiency in UV/Fe(III)-EDDS system were studied. The results showed that Fe(III)-EDDS was a stable complex which was formed by the Fe(III) and EDDS with the molar ratio 1:1. From the photoredox process of Fe(III)-EDDS, the formation of hydroxyl radical was confirmed including that HO• is the main species responsible for the degradation of 4-t-BP in aqueous solution. Ferrous ion (Fe(II)) was also formed during the reaction. With the increasing Fe(III)-EDDS concentration, 4-t-BP degradation rate increased but is inhibited when the Fe(III)-EDDS concentration was too high. Indeed, Fe(III)-EDDS is the scavenger of HO•. pH value had a significant effect on the degradation efficiency of 4-t-BP that was enhanced under neutral or alkaline conditions. On the one hand, Fe(III)-EDDS presented in the FeL-, Fe(OH)L2-, Fe(OH)2L3-, Fe(OH)4- four different forms under different pH conditions and they had different sensitivity to the UV light. On the other hand, pH value affected the cycle between Fe(III) and Fe(II ). The formation of hydroperoxy radicals (HO2•) and superoxide radical anions (O2•-) (pka = 4.88) as a function of pH was also one of the reasons. It was observed that O2 was an important parameter affecting the efficiency of this process. This effect of O2 is mainly due to its important role during the oxidation of the first radical formed on the pollutant. (...)
Gorgy, Karine. "Etude électrochimique de deux catalyseurs d'oxydation : les N-hydroxyphtalimides et les complexes binucléaires oxo de fer (III)." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10258.
Full textGherman, Vasile-Daniel. "Recherches sur les relations entre populations microbiennes et minéralisations des spéléothèmes dans les mines d'Oravita (Roumanie) : le problème des transformations du soufre et du fer." Thesis, Tours, 2008. http://www.theses.fr/2008TOUR4043/document.
Full textLes parois de l'ancienne mine d'or de Kiesberg (Oravita, SO Roumanie), alimentées par les eaux météoriques qui percolent par les microfissures, sont colonisées par des consortiums microbiens diversifiés. Leur fonctionnement repose sur la chimiolithoautotrophie, impliquant l'oxidation de minéraux, essentiellement des sulfures abondants dans la roche, d'ou la formation de différents composés minéraux (hydroxydes de fer, jarosite, composés alumineux amorphes) qui se déposent à l'extérieur des cellules vivantes et forment des accumulations de divers types. Comprendre le fonctionnement de ces microécosystèmes et la génèse des dépôts minéraux induits nécessitait un inventaire microbiologique (techniques classiques et méthode génétique), le suivi au cours du temps des populations des microorganismes en parallèle avec la chimie des solutions, et l'établissement des rapports spatiaux et temporels entre minéraux et organismes, nécessitant des observations macroscopiques et microscopiques par l'utilisation de la microscopie électronique (MET, MEB-EDS, CRYO-MEB)
Locoge, Nadine Galloo Jean-Claude. "Caractérisation des composés organiques volatils dans l'air ambiant de la mesure à l'étude des sources /." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2009. https://iris.univ-lille1.fr/dspace/handle/1908/1223.
Full textN° d'ordre (Lille 1) : 534. Synthèse des travaux (en français) avec publications (en anglais) reproduites dans le texte. Curriculum vitae. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 319-329. Liste des publications et communications.
Hoffendahl, Carmen. "Flame retardancy of EVM-based polymers with low smoke emission." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10048/document.
Full textThis work deals with new elastomeric ethylene-vinyl acetate (EVM) materials containing aluminum trihydroxide (ATH) in combination with melamine or its derivatives are evaluated regarding mechanical properties, hydrothermal aging, fire retardancy and smoke release. The decomposition mechanism of EVM containing ATH and melamine borate (MB) (EVM-ATH-MB) is analyzed in details because of its high stability during hydrothermal aging and its low smoke release. Decomposition reactions EVM-ATH-MB are studies using amongst others new approaches such as pyrolysis-gas chromatography-mass spectrometry (py-GCMS) and mass loss calorimeter coupled with Fourier transform infra-red (MLC-FTIR). It is found that EVM-ATH-MB is mainly protected by the mode of action of ATH diluting the fuel and forming a protective layer that reduces mass and heat transfer
Zhou, Tianhao. "Development of a novel ion eluting copolymer network for osteogenic applications." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/development-of-a-novel-ion-eluting-copolymer-network-for-osteogenic-applications(b58d4681-4711-414b-8bec-15d6018bb9c3).html.
Full textCérin-Delaval, Oriane. "Development and characterization of a novel flame retardant EVM-based formulation : investigation and comprehension of the flame retardant mechanisms." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10132/document.
Full textThis study is dedicated to the formulation of an innovative flame retardant material based on elastomeric vulcanized ethylene-vinyl acetate copolymer (EVM) used in the fields of cable and transportation, and to the comprehension of the flame retardant phenomena. The screening of various additives, evaluated in EVM in terms of mechanical and fire retardant properties, allowed the determination of an innovative combination, made of aluminium trihydroxide (ATH) and aluminium diethyl phosphinate (OP1230). The ATH mode of action, generally assumed to be a cooling effect, was revisited by a kinetic approach of the thermal degradation of the EVM/ATH formulation in oxidative and pyrolytic conditions, associated with the investigation of the evolution of the material in simulated fire conditions. It was found that the cooling effect occurs, but the main protective effect of ATH consists in the formation during combustion of an alumina layer, diminishing the mass and heat transfer and thus the flame feeding. In the complete formulation (EVM/ATH/OP1230), the chemical interactions between ATH, OP1230 and the polymer were investigated, revealing that the synergistic effect provided by the two additives results from the creation during combustion of a resistant glassy layer. Moreover phosphorous species are evolved in the gas phase during combustion, acting as flame inhibitors
Schifano, David. "Étude des mécanismes de base de la dégradation chimique de l'acide nitrilotriacétique, ligand utilisé dans les procédés redox de conversion d'H2S en soufre élémentaire." Lille 1, 2004. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2004/50376-2004-143.pdf.
Full textLeyssens, Gontrand. "Étude de l'incorporation du benzaldéhyde et de composés phénoliques dans des solutions aqueuses : paramètres thermo-cinétiques et implications atmosphériques." Lille 1, 2004. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/830921a1-77df-4227-b1a9-f750dc359b7b.
Full textEn ce qui concerne le benzaldéhyde, la faible valeur du coefficient d'accommodation massique déterminée à 293 K (=2. 10-4) laisse supposer que son incorporation dans les particules d'aérosols aqueux de l'atmosphère est probablement très limitée. Une étude préliminaire a été entreprise pour identifier les produits de réactions qui résulteraient de l'oxydation du p-crésol dissous dans l'eau par le dioxyde d'azote d'une part, et par les radicaux OH d'autre part. Enfin, dans le but de mieux évaluer l'impact potentiel de la chimie multiphasique des COVO étudiés dans ce travail, une étude de deux scénarii par temps de ciel clair et de ciel nuageux a été réalisée pour estimer les durées de vie et les temps caractéristiques des différents processus responsables de leur évolution spatio-temporelle dans la troposphère. Cette étude montre que l'accommodation massique des composés phénoliques étudiés s'avère. être un processus très rapide en regard des durées de vie de ces composés dans la phase gazeuse de la troposphère et que, par conséquent, leur assimilation par les hydrométéores ne devrait pas être limitée par le processus d'accommodation et serait plus rapide en présence de nuages. En modifiant la composition de la tropüsphère,. 1a chimie multiphasique des COVO étudiés pourrait avoir un impact sur sa capacité oxydante
Ngohang, Franck Estimé. "Combination of mass loss cone, Fourier transforminfrared spectroscopy and electrical low pressure impactor to extend fire behaviour characterization of materials." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10167/document.
Full textA bench-scale test combining mass loss cone, Fourier transform Infrared Spectroscopy and Electrical Low Pressure Impactor (MLC/FTIR/ELPI) was developed to enable simultaneous evaluation of the flammability parameters, the gases evolved (qualitative and quantitative evaluation) and the smoke particles (size distribution and concentration) generated by the combustion of the studied materials. This bench test is designed specifically to investigate the fire behaviour of manufactured products such as electric cables, as it is difficult to fully examine the latter with bench tests of the type thermogravimetry or pyrolysis - gas chromatography/mass spectrometry, which can only hold small quantities of sample (from µg to a few mg). After setting up the MLC/FTIR/ELPI coupling, methodologies were established for qualitative and quantitative analysis of evolved gases and smoke particles. Experimental trials conducted on ethylene vinyl acetate (EVA) and ethylene vinyl acetate/aluminium trihydroxide (EVA/ATH) as reference materials demonstrated that the bench test provides accurate, meaningful and repeatable results
Crunaire, Sabine Fittschen Christa. "Développement d'un spectromètre cw-CRDS et son application à l'étude de mécanismes de réaction en chambre de simulation atmosphérique." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/237.
Full textN° d'ordre (Lille 1) : 3718. Publications en anglais reproduites en annexe. Résumé en français et en anglais. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 187-205.
Kergourlay, Florian. "Étude des mécanismes de déchloruration d'objets archéologiques ferreux d'origine sous-marine." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00804629.
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