Dissertations / Theses on the topic 'Absorption and adsorption'
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Kalimtgis, Konstandinos. "ADSORPTION OF TRICHLOROETHYLENE AND CARBON TETRACHLORIDE ON SYNTHETIC AND NATURAL ADSORBENTS." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275355.
Full textLewis, D. "Enzyme adsorption to polystyrene latex." Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382347.
Full textMohd, Ali. "Adsorption et électrosorption d'herbicides et de tensioactifs sur charbons actifs en grains." Pau, 1996. http://www.theses.fr/1996PAUU3028.
Full textJohnson, William H. "Sorption models for U, Cs, and Cd on upper Atlantic Coastal Plain soils." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/16609.
Full textMerino, Jose Carlos Alvarez, and Kazuo Hatakeyama. "Technology surveillance of the solar refrigeration by absorption/adsorption." Institute of Electrical and Electronics Engineers Inc, 2016. http://hdl.handle.net/10757/622310.
Full textIn order to establish networks of cooperation looking for not to duplicate research and even to make use of existing research in a remote form, it is necessary to identify and classify (around the world) the researchers and laboratories, that are researching in the topic of solar refrigeration by absorption/adsorption. The methodology consists in: i) the technology's classification, ii) technological trajectory Identification, iii) a thematic bibliographic review, and iv) patent's analysis. In this way, with the previous determination of keywords, will be identified main authors and their respective institutions. With the same keywords, are determined the licensed patents (in certain span of time). In addition, the analysis of publications, patents, and commercial products give us an opportunity to establish comparisons between prototypes and tests (in several conditions). The larger results implicate the use of actor's network and the remote access to the data and tests, for a collaborative research, overcoming the lack of laboratory resource and accelerating the knowledge acquisition
Revisión por pares
Robinson, Andrew William. "Adsorption on platinum (110) : reflection-absorption infra-red studies." Thesis, University of Bath, 1988. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379555.
Full textDeyme, Michel. "Modification de la composition chimique superficielle de polymères : étude de l'adsorption du collagène aux interfaces air ou polymère/solutions aqueuses." Paris 11, 1989. http://www.theses.fr/1989PA114804.
Full textMercury, Maud Chloé. "Etude de méthodes et moyens d'adsorption/désorption pour l'analyse en ligne de traces de dioxines/furannes à l'émission de sources fixes." Aix-Marseille 1, 2010. http://www.theses.fr/2010AIX11049.
Full textWaste management is a major problem of our society where the amount of waste is still increasing. In 2008, in France, 868 million tons of waste were produced. Today, incineration is considered to be an effective method for disposing of waste. However, since the discovery dioxins generated in all waste plants, this technique becomes a topic of great concern. The authorities require a regulation of dioxin emissions lower than 0. 1 ng ITEQ. M-3 in Europe. Consequently it appears very important to measure and control in “real time” dioxin emission levels from waste incinerators. The major focus of this dissertation work centers on the development of an on-line, real time and direct monitoring technique to study stationary emission sources of dioxins/furans. It concerns the study of new classes of selective adsorbents; in relation to the complexity of the gas mixture in the incinerator’s emissions and to the possible existence of the gas phase dioxin congeners. In a first time, these works focus on study, synthesis and characterization of new selective adsorbent materials as zeolites. These materials have been used as supports for adsorption of solutions of dioxins (2,3- DCDD and 1,2,3,4-TCDD in isooctane) and they have been compared to adsorbents used in NF EN 1948 standard during emission sampling. This study shows that NaX zeolite was the best adsorbent for selective trapping on dioxins. In a second time, an analytical method for on line monitoring of gas phase dioxin at the emission of waste incinerators is designed and developed. This method is based on an adsorption/ thermal desorption device coupled to gas chromatography and mass spectrometry. The device allows the on-line analysis of the standard gas flue of dioxins and the analysis of dioxins trapped in an adsorbent tube. To conclude, these works shows the interest of use zeolites for selective trapping of gas phase dioxins in an on-line field device of adsorption/ thermal desorption of dioxins from stationary sources
Caja, Monique. "Adsorption du gaz naturel sur les charbons en conditions anhydres et saturées en eau : Etude des quantités adsorbées et du fractionnement isotopique." Aix-Marseille 2, 2000. http://www.theses.fr/2000AIX22019.
Full textNelson, Peter Robert. "Oxygen from air by pressure swing adsorption." Thesis, Cape Technikon, 1993. http://hdl.handle.net/20.500.11838/1281.
Full textThe main objective of the work outlined in tills project is to create an awareness of Pressure Swing Adsorption (PSA) Processes, their application to oxygen production systems in the RSA and the construction and testing of a pilot plant, built to assess an overseas design. Available oxygen PSA technology was examined from a theoretical approach, right through to practical applications. The aim was not to re-invent the technology, but to review what technology is available and to assess its suitability for the South African Industrial Sectors. This was undertaken by investigating all PSA processes that are available to market the product to industry. The technology review includes an investigation of overseas PSA technologies and compares these modes of technology with the technology that is readily available to Afrox Limited, a major gas supplier in South Africa. This resulted in the technology from the British Oxygen Company being thoroughly reviewed, examined and compared to various other modes of technology. The basic principals of adsorption are discussed to give the reader an understanding of the factors that influence efficient adsorption and adsorbent regeneration. The parameters that defme when adsorption separation processes are applicable to the separation of atmospheric gases are also discussed. The different types of PSA plant layout are discussed in great detail and it is explained when each plant layout type would be used.
Nanakassé, Sidiki. "Sur l'utilisation du gel de silice dans des machines frigorifiques à affinité : adsorption de l'eau et du méthanol." Dijon, 1986. http://www.theses.fr/1986DIJOS070.
Full textNavarro, Pedro. "Etude du comportement électrochimique des électrodes à pâte de carbone : application à l'étude des espèces adsorbées sur solide non électroactif." Lyon 1, 1996. http://www.theses.fr/1996LYO10025.
Full textFu, Yong 1948. "Solid activity coefficients of phosphate adsorbed by soil." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276722.
Full textMocho, Pierre. "Adsorption de composés organiques volatils sur charbon actif : régénération in situ du charbon par chauffage par induction électromagnétique." Pau, 1994. http://www.theses.fr/1994PAUU3015.
Full textBenaïssa, Houcine. "Adsorption de propane et propylène sur corps microporeux." Grenoble INPG, 1988. http://www.theses.fr/1988INPG0106.
Full textCosnier, Frédéric. "Contribution à l'étude de l'adsorption et de la désorption de composés organiques volatils chlorés sur charbons actifs." Nancy 1, 2004. http://www.theses.fr/2004NAN10156.
Full textAdsorption and desorption of water and chlorinated volatile organic compounds (VOCs) in static (adsorption isotherms) and dynamic conditions (breakthrough curves) have been performed on different activated carbons (ACs) (granulated ACs and activated carbons fibers) with different textural characteristics and surface chemistry. The main objective of this study is to separate the different component of a chlorinated VOCs mixture in the presence or not of water vapor. It appears that both porous texture and surface chemistry of ACs as physicochemical characteristics of the probes have a strong influence on their adsorption (or desorption) process (mechanism and kinetics). A special attention has been drawn on the influence of the water presence: at high relative humidity rate, ACs adsorption properties (adsorbed amount and kinetics) for chlorinated VOCs are strongly affected. Separation of the dichloromethane/trichloroethylene mixture has been successfully realized whatever the experimental conditions. Last, an exploratory study on the AC hydrophobisation possibilities by the graphting of non-polar groups in liquid phase has been undertaken in order to limit the water presence effects
Ming, Loh Kong. "Etude de la compétition d'adsorption entre les composés oxygénés et les hydrocarbures sur les tamis moléculaires." Lyon 1, 1996. http://www.theses.fr/1996LYO10308.
Full textRojas, Devia Carolina. "Biogaz en vue de son utilisation en production d'énergie : séparation des siloxanes et du sulfure d'hydrogène." Phd thesis, Ecole des Mines de Nantes, 2013. http://tel.archives-ouvertes.fr/tel-00824324.
Full textElayadi, Houda. "Comparaison physico-chimique et sites catalytiques entre les solides Au/CeO2 préparés par deux méthodes différentes : déposition-précipitation et imprégnation." Littoral, 2010. http://www.theses.fr/2010DUNK0269.
Full textTwo 4%Au/CeO2 catalysts have been prepared by two different methods : deposition-precipitation (DP) and impregnation (Imp). From the XRD, SEM and TEM study, nanoparticles of gold have been evidenced in the DP catalyst and agglomerates nearby nanoparticles in the Imp solid. Compared to the Imp solid, the DP catalyst showed a better catalytic activity in the CO oxidation reaction, the total oxidation of propene and the combustion of carbon black (soots). This difference in the activity is related to the presence of well-dispersed gold nanoparticles on the DP solid surface and a significant quantity of Aun+ located nearby the metallic gold and the O2- ions of the ceria lattice. The weak activity of the Imp catalyst is correlated to the presence on the surface of gold agglomerates and an important amount of chloride ions. These latter species are known as inhibitor in calatysis. In order to elucidate the redox properties of both DP and Imp catalysts, the solids have been degassed and treated under vacuum at 400°C for 1h before the absorption of air. Therefore, the two catalysts have been studied with the EPR technique. Two signals completely different have been evidenced : the first one with g- < g// on DP and the other one, denoted M, with g- > g// on the Imp catalyst. The DP signal has been attributed to O2- species whereas, the attribution of M signal has needed of more detailed study. In fact, the adsorption of air on x%Au/CeO2 (Imp) solids, where 0 <(or egal) x <(or egal) 4, has shown using the EPR technique, the appearance of a new P signal nearby of the M signal for Au contents less than x = 2. 5. From EPR results obtained after absorption, on x%Au/CeO2 (Imp) solids, O2, N2, O2+N2 or air, O2 before N2 ; N2 before O2, NO, N2O and NO2, the P signal has been attributed to O2- , NO2 2- or NO3 2- and M signal M to NO, O- or N2O-. The Nox formed can be considered as intermediate or final products. From these results mechanisms corresponding to all the formed products have been proposed
Zghida, Haïfa. "Utilisation de ligno-celluloses cationiques pour la dépollution des eaux : application à la sorption de surfactants et des oxy-anions du chrome." Lyon 1, 2002. http://www.theses.fr/2002LYO10042.
Full textCanard, Gabriel. "Matériaux hybrides organiques-inorganiques incorporant des métallocorroles de cobalt(III) : application à l'adsorption sélective du monoxyde de carbone." Dijon, 2004. http://www.theses.fr/2004DIJOS046.
Full textChristiaen, Anne-Claire. "Adsorption of water and carbon monoxide on Cu₂O(111) single crystal surfaces." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-11102009-020324/.
Full textNavaei, Milad. "Quartz crystal microbalance adsorption apparatus for high pressure gas adsorption measurements in nanomaterials." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41057.
Full textPayne, Timothy Ernest Civil & Environmental Engineering Faculty of Engineering UNSW. "URANIUM (VI) INTERACTIONS WITH MINERAL SURFACES: CONTROLLING FACTORS AND SURFACE COMPLEXATION MODELLING." Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 1999. http://handle.unsw.edu.au/1959.4/17482.
Full textGorse, Joseph III. "CHARACTERIZATION OF THE SOLID-LIQUID INTERFACE ON CHEMICALLY MODIFIED PARTICULATE SURFACES (CHROMATOGRAPHY, ISOTHERM)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188088.
Full textSahel, Abdelkrim. "Contribution à l'étude en régime dynamique de la sorption sur charbon actif de molécules organiques. Comparaison et simplification de différents modèles." Limoges, 1993. http://www.theses.fr/1993LIMO0190.
Full textNarayan, Shankar B. "Measurement of diffusion and adsorption in porous adsorbents." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73968.
Full textPerrin, Amandine. "Contribution à l'étude du stockage du méthane par adsorption." Nancy 1, 2004. http://www.theses.fr/2004NAN10125.
Full textNatural gas, which methane is the main component, is an alternative fuel. It is abundant and has clean burning characteristics; however its storage is difficult due to its very low density. Two storage routes were investigated. Methane adsorption was studied in optimized microporous carbons. They were prepared by chemical activation of anthracite powders with sodium hydroxide, and were then compacted. Associating both high adsorptive capacities and high apparent densities finally allowed exceeding the target of 150 volumes of methane delivered per volume of storage vessel at 20ʿC and 3. 5 MPa. Formation of methane hydrates was also observed in micro mésoporous carbons, at 2ʿC and at pressures higher than 4 MPa
Robinson, Kevin G. "Influence of organic matter on the sorption and bioavailability of 2,4,6-trichloro-(¹⁴C)-phenol." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-08082007-114313/.
Full textMauviel, Guillain. "Transport multi-composants dans les polymères : séparation hydrocarbures / hydrogène par membrane à sélectivité inverse." Vandoeuvre-les-Nancy, INPL, 2003. http://docnum.univ-lorraine.fr/public/INPL_T_2003_MAUVIEL_G.pdf.
Full textHydrocarbon / hydrogen separation by reverse selectivity membranes is investigated. The first goal is to develop materials showing an increased selectivity. Silicone membranes loaded with inorganic fillers have been prepared, but the expected enhancement is not observed. The second goal is to model the multi- component transport through rubbers. Indeed the permeability model is not able to predict correctly permeation when a vapour is present. Thus many phenomena have to be considered: diffusional interdependancy, sorption synergy, membrane swelling and drag effect. The dependence of diffusivities with the local composition is modelled according to free-volume theory. The model resolution allows to predict the permeation flow-rates of mixed species from their pure sorption and diffusion data. For the systems under consideration, the diffusional interdependancy is shown to be preponderant. Besides, sorption synergy importance is pointed out, whereas it is most often neglected
Davis, James Hal 1956, and James Hal 1956 Davis. "Sorption and desorption of benzene and para-xylene on an unsaturated desert soil." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/291366.
Full textPeters, Richard Edward. "An experimental apparatus for the measurement of sorption isotherms of moisture in porous building materials." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040234/.
Full textDelgado, Cano Beatriz. "Caractérisation des matériaux commerciaux et synthétisés destinés à adsorber le méthane et l'oxyde nitreux présents dans des émissions gazeuses et modélisation de l'adsorption." Doctoral thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27771.
Full textHuman activities contributed with a significant increase in GHG concentrations over the past 150 years and they are related to environmental issues, such as global warming and climate change. The agricultural sector contributes 8 to 10% of total GHG emissions to the atmosphere, being carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O) the main GHGs emitted. The control and quantification of these emissions requires technologies which can capture and or degrade these GHG, for example by adsorption. The objective of this project is to characterize adsorbents and to describe their adsorption kinetics in order to select the most suitable for the adsorption of CH₄ and N₂O at low concentration and at ambient temperature. For CH₄ adsorption, commercial and synthesized adsorbents were tested. The selected adsorbents were commercial zeolites, laboratory conditioned biochar and synthesized ZIF ("Zeolitic imidazolate framework"). ZIF was also used for N₂O adsorption. The adsorption capacity of CH₄ and N₂O for each adsorbent was evaluated by dynamic adsorption tests of the gas under atmospheric conditions. Commercial zeolites, in the form of pellets and powders, were physically and chemically characterized in order to correlate their properties with its CH₄ adsorption capacity. The effect of zeolites structure and chemical composition on the adsorption capacity of CH₄ was evaluated for zeolites in the form of pellets and powders. CH₄ adsorption capacity of commercial zeolites was studied at 30 °C, atmospheric pressure and at CH₄ partial pressures lower than 0.40 kPa (4000 ppm CH₄). Freundlich isotherm fitted the experimental data of CH₄ adsorption. The adsorption capacity of CH₄ increased with the surface area and pore volume, while decreased with the Si/Al ratio and temperature. Furthermore, the zeolites in powder form exhibited higher CH₄ adsorption capacities than those of zeolites in pellets. The torrefied cardboard was chemically treated with KOH and it was physically, chemically and thermally characterized to correlate its properties with its CH₄ adsorption capacity and to predict the durability of the samples. The adsorption capacity of CH₄ of torrefied cardboard was studied at 30 °C, atmospheric pressure and CH₄ partial pressures lower than 0.40 kPa (4000 ppm CH4). The Freundlich adsorption isotherm fitted correctly the experimental data. CH4 adsorption capacity increased with torrefaction time and decreased with chemical treatment. ZIF-8 was obtained by solvothermal synthesis and was physically and chemically characterized in order to correlate its properties with its adsorption capacity of CH₄ and N₂O. The adsorption capacity of CH₄ and N₂O was studied at 30 °C and atmospheric pressure, while the partial pressures of CH₄ and N₂O evaluated were lower than 0.40 kPa for CH₄ (4000 ppm CH₄) and lower than 0.10 kPa for N2O (1000 ppm N₂O). The experimental adsorption of CH₄ an N₂O was fitted by Freundlich isotherm. Furthermore, the adsorption of a mixture of CH₄ and N₂O was evaluated, being CH₄ breakthrough influenced in the presence of N₂O. Among the different materials used for CH₄ adsorption at 30 ºC and partial pressures lower than 0.40 kPa (4000 ppm CH₄), biocharbons presented the highest adsorption capacity, followed by ZIF- 8 and commercial zeolites.
Forsling, Scott A. "Sorption and biodegradation of phenanthrene in soils." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-11102009-020357/.
Full textLuciani, Laurent. "Adsorption de molécules tensioactives du type alkylpoléthoxy sulfate de sodium à l'interface oxyde minéral - solution aqueuse." Aix-Marseille 3, 1995. http://www.theses.fr/1995AIX30048.
Full textDecrette, Armelle. "Etude par simulation numérique de la dynamique moléculaire de l'adsorption de l'éthylène et du n-butane dans la silicate-1 : modélisation des spectres d'absorption infrarouge et de la cinétique d'adsorption." Dijon, 2004. http://www.theses.fr/2004DIJOS076.
Full textThe objective of this work is to develop a tool for molecular dynamics simulation for the study of the adsorption of gases in the porous solids. Two sets of themes of research currently under development are particularly aimed: hydrocarbon diffusion linear and connected in C6 on a silicalite by manometry out of equilibrium, and the adsorption of trichloroethene and tetrachloroethene on a silicalite by infrared spectroscopy. The implementation of this new set of themes of modelling being difficult with such molecules, we decided to work on less complex molecules: butane for the study of the diffusion, and ethylene for the infrared spectroscopy. The tool for numerical simulation set up rests on the principle of molecular dynamics except transient equilibrium. It makes it possible to study equilibria and the kinetics of adsorption according to protocols inspired by those used in experiments. Data of adsorption to equilibrium as well as dynamic properties and vibrational can be determined
Dufau, Nathalie. "Organisation de la phase adsorbée dans des matériaux microporeux modèles : étude thermodynamique structurale et dynamique." Aix-Marseille 3, 2000. http://www.theses.fr/2000AIX30083.
Full textThe inherent complexity of many industrial adsorbents renders the results of the physisorption of simple gases on such materials relatively difficult to interpret. With the aim to understand more clearly phenomena that occur during adsorption, the present study concentrates on well-defined model adsorbents whose pores are of molecular dimensions. This study initially focuses on an aluminophosphate with a neutral structure (without condensation cations) and unidirectional micropores of elliptical cross-section : AIPC>4-11. The conclusions obtained are then extended to systems such as ZSM-12, mordenite, 5A and 13X with both more complex micropore networks and non-neutral frameworks containing condensation cations. The interest of this study lies in the elucidation of the successive phenomena that may occur during the micropore filling process. The most suitable AIPC>4-11 sample was chosen following the most appropriate synthesis conditions and after controlling the liberation of the microporosity. This allowed the elimination of the organic template without degradation, via an evaporation-type process. .
Li, Yong, and 李勇. "Performance prediction model for a rotary multi-bed adsorption coolingsystem." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245742.
Full textAli, Iqbal 1948. "THE SURFACE CHEMISTRY OF CHROMIUM OXIDES IN AQUEOUS SOLUTIONS." Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276486.
Full textChen, Chiahong. "Studies of adsorption and stabilization of silica suspensions using well-defined polymeric dispersants." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/40064.
Full textNiemeyer, Antje. "Prozessanalyse mit Hilfe von mathematischen und statistischen Methoden am Beispiel von Ad- und Desorption im Boden /." Aachen : Shaker, 2000. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=009102162&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textLOPEZ, ANAYA ARTURO. "ABSORPTION AND DISPOSITION KINETICS OF RIBOFLAVIN AND ASCORBIC ACID IN HUMANS AS A FUNCTION OF AGE." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184078.
Full textBROSILLON, STEPHAN. "Traitement des composes organiques volatils (cov) par adsorption sur zeolithe. Etude du couplage absorption/adsorption applique au traitement de l'air." Toulouse, INSA, 2000. http://www.theses.fr/2000ISAT0026.
Full textOlal, Andrew Dandy. "A surface and colloid chemical study of the interaction of proteins with polystyrene latex (PSL)." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30570.
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Chemistry, Department of
Graduate
Babaa, Moulay-Rachid. "Contribution à l'étude de l'adsorption physique de gaz sur les nanotubes de carbone mono- et multiparois." Nancy 1, 2004. http://docnum.univ-lorraine.fr/public/SCD_T_2004_0239_BABAA.pdf.
Full textThis work is devoted to study of the adsorption of simple gases (Kr, Xe and CCl4) on single-wall and on multi-wall carbon nanotubes. Based on comparison of isotherms and heats of adsorption on nanotubes with those on planar graphite, we first determined the adsorptive sites and the influence of the nanotube curvature. We studied the effect of two nanotube opening techniques on their adsorptive properties and capacities. Comparison of the isotherms before and after mechanical opening of single-wall nanotubes allowed us to estimate the fraction of internal accessible surface and to evaluate the fraction of impurities introduced upon opening. We showed that the three gases should have different arrangements inside the tubes according to their diameter. Study of Kr adsorption on multi-wall nanotubes before and after opening using oxidation allowed determining the efficiency and influence of such treatment on the surface properties of the nanotubes as well as the oxidation mechanism
Sautel, Ghislaine. "Biofixation du cadmium par la bactérie Pseudomonas putida." Aix-Marseille 1, 1991. http://www.theses.fr/1991AIX11381.
Full textGentilhomme, Valérie. "Quantification des flux d'absorption et de régénération de l'azote minéral (nitrate, nitrite et ammonium) et organique (urée) dans la couche euphotique des océans oligotrophes." Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22103.
Full textBertin, Gilles. "L'immobilisation de l'atrazine par la matière organique des sols : une approche modélisée en conditions naturelles et au laboratoire." Vandoeuvre-les-Nancy, INPL, 1989. http://www.theses.fr/1989NAN10275.
Full textGerente, Claire. "Fixation de l'arsenic (V) sur le chitosane : étude des mécanismes et procédé." Nantes, 2005. http://www.theses.fr/2005NANT2053.
Full textThe aim of this work is to perform a dynamic treatment process with chitosan, for arsenic removal. After a physico-chemical characterisation of the material, the kinetic study has shown that experimental data could be described by the pseudo first-order model. Then, the analysis of different adsorption models confirm that the mechanism of sorption is an electrostatic attraction and ion exchange. Temperature, pH and the presence of divalent anions are the main influencing parameters. The dynamic study involves a continuous stirred tank reactor coupled with a microfiltration membrane. A mass balance model based on the Langmuir equilibrium isotherm is used to describe the adsorption process and the breakthrough curves are well simulated. Based on these results, it is demonstrated that chitosan is an interesting biomaterial for the treatment of water contaminated with arsenic (V)
De, Oliveira Tiago. "Absorption de produits pharmaceutiques par les organoclays : des matériaux polyvalents pour des applications environnementales." Thesis, Orléans, 2019. http://www.theses.fr/2019ORLE3001.
Full textAdsorption represents an easy, simple and low-cost way to remove both organic and inorganic pollutants in water. Clay minerals are well known for their outstanding adsorption properties for numerous products. The chemical modification of its surface through the intercalation of surfactants for the preparation of organoclays considerably improves the adsorption properties, in particular for hydrophobic organic compounds such as pharmaceutical products (PPs) which are more and more commonly found in sewage and surface water. In the present contribution, the adsorption PPs with different therapeutic actions and varied physicochemical properties onto clay mineral and organoclay derivatives prepared with different surfactants (cationic and nonionic) has been studied with a particular understanding of the interactional mechanisms of PP with the adsorbents in order to (i) evaluate the stability of materials for an application in purifying context and (ii) to apprehend the role of the mineral phases in the fate of organic micropollutants in the natural environment. The experimental data obtained by a set of complementary techniques reveal that organoclays prepared with nonionic surfactants show a versatility for numerous PPs while the hydrophobic environment generated by the grafting of surfactants with alkyl-chains particularly enhances the adsorption of the organic compounds. The study confirmed the efficiency and the promising remediation behavior of organoclays for wastewater treatment