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Littérature scientifique sur le sujet « Adsoprtion »

Auteur : Grafiati

Publié le 6 avril 2023

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Articles de revues sur le sujet "Adsoprtion"

Kang, Seog-Goo, et Hwa-Hyoung Lee. « Adsoprtion Characteristic of Fancy Veneer Overlaid Charcoal Board Composite ». Journal of the Korean Wood Science and Technology 38, n^o 5 (25 septembre 2010) : 385–90. http://dx.doi.org/10.5658/wood.2010.38.5.385.

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Ray, Martyn S. « Adsoprtion and adsorptive separations : A bibliographical update (1992?1993) ». Adsorption 1, n^o 1 (1995) : 83–97. http://dx.doi.org/10.1007/bf00704148.

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Yang, M., J. Hubble, A. D. Lockett et R. R. Rathbone. « Thermal monitoring of phenoxyacid herbicide adsoprtion on granular activated carbon ». Water Research 31, n^o 9 (septembre 1997) : 2356–62. http://dx.doi.org/10.1016/s0043-1354(97)00086-9.

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Darmadi, Darmadi, Irfan M, Iqhramullah M, Marlina Marlina et Mirna Rahmah Lubis. « SYHNTHESIS OF CHITOSAN MODIFIED POLYURETHANE FOAM FOR ADSOPRTION OF MERCURY (II) IONS ». Jurnal Bahan Alam Terbarukan 7, n^o 1 (22 juillet 2018) : 18–27. http://dx.doi.org/10.15294/jbat.v7i1.13614.

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Mercury from the traditional gold mining activities in Aceh Jaya Regency causes water source and thus residents are exposed to mercury metals. In organic and inorganic conditions, mercury is toxic to the human body, causes damage to the nerve system, kidney failure, heart failure, blood pressure disorders, and damage to the immune system. The problem of mercury contamination can be chemically solved in various ways. This research uses polyurethane foam to adsorb mercury from water. The adsorption and selectivity of polyurethane foam adsorption can be improved through modification with Chitosan. In this research, preheating temperature, glycerol and toluene di-isocyanate (TDI) compositions greatly affect the physical form of foam. The condition under which optimal glycerol composition used for synthesizing the polyurethane foams is 20% (w/w of mixture A). This glycerol composition results in polyurethane foams with an optimum ratio of the mixture A/TDI/distilled water of 2 : 1 : 1. The best adsorption is obtained with polyurethane foam added by 2.5% Chitosan. The optimum mercury adsorption 25% is resulted from the operating time of 60 minutes with adsorption capacity of 0.313 mg/g. For Chitosan modified polyurethane foam, research points out that the reaction is the second order reaction. The result concluded that the polymer has semi crystalline crystallization and melting temperatures.

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Horn, M. « A new theory of adsoprtion for the quantitative description of gas sensors ». Sensors and Actuators B : Chemical 26, n^o 1-3 (janvier 1995) : 217–19. http://dx.doi.org/10.1016/0925-4005(94)01590-e.

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Andreas, Roy, Uyi Sulaeman et Tien Setyaningtyas. « PEMANFAATAN KARBON SABUT KELAPA TERIMPREGNASI UNTUK MENGURANGI TEMBAGA(II) DALAM MEDIUM AIR ». Molekul 3, n^o 2 (1 novembre 2008) : 91. http://dx.doi.org/10.20884/1.jm.2008.3.2.53.

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This research is conducted to produce carbons from coconut fibre which approach to activated carbon clause continue with carbon surface modification and the adsorption examination to Cu(II) ions. The research consist of several phase. Carbon making of coconut fibre conducted by carbonization processes at 320-400oC with temperature interval 20oC. Carbon yielded in characterized moisture content, ash content and its adsoprtion to iodium. The carbon surface modification conducted by loaded 2-mercaptobenzotiazol (MBT) on carbon. The adsorpsibility of carbon-MBT tested by influence of contact time, pH, and the isoterm adsorption pattern. The result of the study showed carbonization of coconut fibre which approach the requirement of SII No.0258-89 gained at temperature 320oC. In the present study equilibrium time of 10 minute and pH was found to be optimum for both adsorbent. While type of isothermal adsorption from carban and carbon-MBT adsorbent followed the Langmuir adsorption pattern.

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Dovesi, R., R. Orlando, F. Ricca et C. Roetti. « Co adsoprtion on MgO crystals : Hartree-fock calculations for regular adlayers on a (001) lattice plane ». Surface Science 186, n^o 1-2 (juillet 1987) : 267–78. http://dx.doi.org/10.1016/s0039-6028(87)80048-1.

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Levin, M., A. Grizodoub, N. Asmolova, V. Grigorieva et V. Georgievsky. « Model of mixed adsoprtion centre for description of retention in liquid chromatography with multi-component mobile phases ». Chromatographia 37, n^o 9-10 (novembre 1993) : 517–24. http://dx.doi.org/10.1007/bf02275790.

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Mohamed, Mohamed Gamal, Mahmoud M. M. Ahmed, Wei-Ting Du et Shiao-Wei Kuo. « Meso/Microporous Carbons from Conjugated Hyper-Crosslinked Polymers Based on Tetraphenylethene for High-Performance CO2 Capture and Supercapacitor ». Molecules 26, n^o 3 (31 janvier 2021) : 738. http://dx.doi.org/10.3390/molecules26030738.

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In this study, we successfully synthesized two types of meso/microporous carbon materials through the carbonization and potassium hydroxide (KOH) activation for two different kinds of hyper-crosslinked polymers of TPE-CPOP1 and TPE-CPOP2, which were synthesized by using Friedel–Crafts reaction of tetraphenylethene (TPE) monomer with or without cyanuric chloride in the presence of AlCl3 as a catalyst. The resultant porous carbon materials exhibited the high specific area (up to 1100 m2 g−1), total pore volume, good thermal stability, and amorphous character based on thermogravimetric (TGA), N2 adsoprtion/desorption, and powder X-ray diffraction (PXRD) analyses. The as-prepared TPE-CPOP1 after thermal treatment at 800 °C (TPE-CPOP1-800) displayed excellent CO2 uptake performance (1.74 mmol g−1 at 298 K and 3.19 mmol g−1 at 273 K). Furthermore, this material possesses a high specific capacitance of 453 F g−1 at 5 mV s−1 comparable to others porous carbon materials with excellent columbic efficiencies for 10,000 cycle at 20 A g−1.

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M. Salleh, N. F., F. F. Asmori, N. M. Shukri et S. F. M. Hanafiah. « Adsorption Of Methylene Blue By Imperata Cylindrica : Reaction Optimization By Response Surface Methodology (RSM) ». Journal of Chemical Engineering and Industrial Biotechnology 7, n^o 2 (21 novembre 2021) : 27–33. http://dx.doi.org/10.15282/jceib.v7i2.7020.

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Imperata Cylindrica (IC) is a solid waste that is readily available throughout the year known as one of the most important weed in the world and frequently causes major disposal issues. As a result, using IC as a low-cost adsorbent is beneficial from both, economic and environmental standpoint to remove colors from wastewater of textile industry. This work studies the reaction optimization of methylene blue (MB) removal using IC by response surface methodology (RSM). The RSM experiments were designed with 4 independent variables (initial adsorbent dosage, initial pH, initial dye concentration, and initial temperature) and 1 response variable (percent removal of MB). According to the pareto figure, the initial pH demonstrated the greatest impact on the percent removal of MB. The RSM data predicted the optimum condition of MB removal up to 86.61% using IC, by utilizing adsorbent dosage of 1.458 g/L, at 42 oC, initial pH of 6.8 and MB concentration of 235 ppm. The chacterization analysis revealed the physicochemical properties of IC in the adsoprtion process.

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Thèses sur le sujet "Adsoprtion"

Debroise, Théau. « Calcium Oxalate and Calcium Phosphate Biominerals : Formation and Stability studied by Molecular Dynamics ». Electronic Thesis or Diss., Sorbonne université, 2019. https://theses.hal.science/tel-04059925.

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Cette thèse s’articule autour de la thématique de la biominéralisation, le processus par lequel les êtres vivants parviennent à orienter la précipitation de minéraux présents dans leur environnement pour confectionner des matériaux utiles à la survie de l’espèce considérée. La biominéralisation est un phénomène extrêmement complexe mettant en jeu des régulations génétiques et l’implication de protéines permettant d’enclencher la minéralisation, à des localisations bien précises. Il arrive cependant que celle-ci échappe au contrôle de l’organisme vivant conduisant alors à diverses pathologies. C’est le cas par exemple, quand des calcifications appelées calculs rénaux, se forment à l’intérieur des reins. A partir d’une certaine taille, un calcul rénal devient pathologique et nécessite une prise en charge hospitalière. La pathologie est communément appelée lithiase urinaire. Il est établi que les oxalates de calcium, et plus particulièrement les phases monohydratée (Calcium Oxalate Monohydrate, COM ou whewellite) et dihydratée (Calcium Oxalate Dihydrate, COD ou weddellite), composent la majorité des calculs rénaux. L’environnement, et tout particulièrement l’alimentation, est un facteur clé influençant la formation et la composition des calculs rénaux. Actuellement, les traitements consistent principalement à une injection d’antalgiques et à l’éjection du calcul par les voies naturelles. Si nécessaire, une intervention chirurgicale est mise en œuvre. Les médecins sont à la recherche de médicaments/traitements potentiellement capables de prévenir la formation des calculs rénaux. Dans cette thèse, nous avons choisi d’aborder cette problématique par le biais de la chimie théorique et plus particulièrement de la dynamique moléculaire, une méthode prédictive d’importance permettant d’étudier le comportement d’un modèle atomique au cours du temps
This thesis is about biomineralisation, the process by which living beings manage to direct the precipitation of minerals present in their environment to make materials useful for the survival of the species in question. Biomineralization is an extremely complex phenomenon involving genetic regulation and the involvement of proteins to trigger mineralization at specific locations. It happens however that it escapes the control of the living organism, then leading to various pathologies. This is the case, for example, when calcifications called kidney stones are formed inside the kidneys. From a certain size, a renal calculus becomes pathological and requires hospital care. The pathology is commonly called urolithiasis. It is established that calcium oxalates, and more particularly the monohydrate (Calcium Oxalate Monohydrate, COM or whewellite) and dihydrate (Calcium Oxalate Dihydrate, COD or Weddellite) phases, make up the majority of kidney stones. The environment, and especially food, is a key factor influencing the formation and composition of kidney stones. Currently, the treatments consist mainly of an injection of analgesics and the ejection of the calculation by the natural channels. If necessary, surgery is performed. Doctors are looking for drugs / treatments that can potentially prevent the formation of kidney stones

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Santos, Ana Catarina Almeida. « Purine removal with graphene based materials foreseeing their application in the brewing industry ». Master's thesis, 2019. http://hdl.handle.net/10773/30111.

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Beer exhibit purine compounds which are catabolized into uric acid leading to its serum level increase which may contribute to hyperuricemia and gout. Thus, it is relevant develop an efficient and selective method to remove these compounds from beer. An iron oxide functionalized graphene-based material was prepared through a sustainable approach, characterized and used to remove purine compounds in an aqueous media. Kinetic and equilibrium isotherm studies were applied to purines and aromatic amino acid adsorption to understand the mechanisms of the process, the relationship with the surface features of the adsorbent material and the interactions and to evaluate the selectivity of the material. The Pseudo Second Order was used to adjust the adsorption kinetic of all the studied compounds, showing an adsorption process on the solid-phase interface on the adsorbent material. A maximum removal efficiency of 68.40 and 69.70% was obtained for adenosine and guanosine and 45.90 and 47.16% for adenine and inosine, showing its applicability on their removal process. A maximum adsorption efficiency of 15.35 and 27.16% was obtained for L-Tyrosine and L-Tryptophan, demonstrating a greater selectivity of the material for purine compounds. SIPS model was adjusted to adsorption isotherm of all the studied purine, except for adenosine, where the Freundlich model was used for the adjust, proving the heterogeneity of the external surface of the material. The SIPS model adjusts the adsorption isotherm of L-Tyrosine, while the Freundlich model was used to adjust the isotherm for L-Tryptophan. Despite its applicability to adsorb purines, further studies need to be accomplished to increase its selectivity and then develop a method to remove them from beer, thus improving brewing industries, allowing it to consume by hyperuricemic and gouty patients and decreasing the healthcare economic burden.
A cerveja exibe compostos de purina que são catabolizados em ácido úrico levando ao aumento dos seus níveis no soro podendo contribuir para hiperuricemia e gota. Logo, é relevante desenvolver um método eficiente e seletivo para remover estes compostos da cerveja. Um material baseado em grafeno funcionalizado com óxido de ferro foi preparado através de um processo sustentável, caracterizado e usado para remover compostos de purina em meio aquoso. Estudos de cinéticas e de isotérmicas de adsorção foram aplicados a purinas e aminoácidos aromáticos para perceber os mecanismos do processo, a relação com as características da superfície do material adsorvente bem como avaliar a seletividade do material. O modelo de Pseudo-Segunda Ordem foi usado para ajustar os dados experimentais de cinéticas de adsorção de todos os compostos estudados, demonstrando uma adsorção na interface sólido-líquido do material adsorvente. Eficiências de adsorção máximas de 68.40 e 69.70% foram obtidas para a adenosina e guanosina e de 45.90 e 47.16% para a adenina e inosina, mostrando a aplicabilidade do material nestes processos de remoção. Uma máxima eficiência de adsorção de 15.35 e 27.16% foram obtidas para a L-Tirosina e o L-Triptofano, demonstrando uma maior seletividade do material para compostos de purinas. O modelo SIPS foi ajustado às isotérmicas de adsorção de purinas à exceção da adenosina, onde o modelo de Freundlich foi usado para o ajuste, e em ambas foi provada a heterogeneidade da superfície externa do material. O modelo SIPS foi ajustado à isotérmica de adsorção da L-Tirosina, enquanto que o modelo de Freundlich foi ajustado para o L-Triptofano. Apesar da sua aplicabilidade para adsorver purinas, futuros estudos devem ser realizados para aumentar a sua seletividade e assim desenvolver um método de as remover da cerveja contribuindo para melhorar a indústria cervejeira, permitir o consumo da mesma por pacientes hiperuricémicos e de gota e diminuir a carga económica associada à saúde.
Mestrado em Bioquímica

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Chapitres de livres sur le sujet "Adsoprtion"

Menig, H., et H. Krill. « Abscheidung gasförmiger Schadstoffe durch Adsoprtion und Adsorptionskatalyse ». Dans Handbuch des Umweltschutzes und der Umweltschutztechnik, 400–472. Berlin, Heidelberg : Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-61397-5_10.

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Korányi, T. I., A. Jentys et H. Vinek. « Adsoprtion and reaction of thiophene over nickel- and cobalt- containing zeolites ». Dans Studies in Surface Science and Catalysis, 582–89. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81271-1.

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Actes de conférences sur le sujet "Adsoprtion"

Rivera, Rosángela, Liliana F. Alzate, Miguel A. Muñoz et Nairmen Mina. « TNT adsoprtion on clay minerals by HPLC ». Dans Defense and Security Symposium, sous la direction de J. Thomas Broach, Russell S. Harmon et John H. Holloway, Jr. SPIE, 2006. http://dx.doi.org/10.1117/12.664091.

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Setiawan, Achmad Dwi, Rudi Kartika et Rahmat Gunawan. « Adsoprtion of Cu(II) ion in aqueous solution by Pseudomonas sp. biosorbent ». Dans THE 3RD INTERNATIONAL CONFERENCE ON MATHEMATICS AND SCIENCES (THE 3RD ICMSc) : A Brighter Future with Tropical Innovation in the Application of Industry 4.0. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0112558.

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Rapports d'organisations sur le sujet "Adsoprtion"

Farnand, B. A., et H. Sawatzky. Preferential adsoprtion and selective permeation of alcoho/hydrocarbon mixtures in reverse osmosis. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/304338.

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