Готові списки джерел за темами / Langmuir kinetic

Добірка наукової літератури з теми "Langmuir kinetic"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Langmuir kinetic"

Kazmi, Mohsin, Anwar R. Saleemi, Nadeem Feroze, Amir Yaqoob, and Syed Waqas Ahmad. "Removal of phenol from wastewater using activated waste tea leaves." Polish Journal of Chemical Technology 15, no. 2 (July 1, 2013): 1–6. http://dx.doi.org/10.2478/pjct-2013-0016.

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This investigation enumerates the treatment of phenol contaminated synthetic wastewater by Activated Waste Tea Leaves (AWTL). Phosphoric acid was used for the modification of waste tea leaves. The effects of initial pH, biosorbent dose, contact time, and initial phenol concentration were studied on the phenol uptake from the synthetic solution. Kinetic modelling was performed using pseudo 1st and 2nd order kinetics. The Langmuir and Freundlich’s Models were employed to interpret the AWTL behaviour at various mass transfer gradients. The results show that the optimum values for pH, biosorbent dose and contact time were 2.2 g/L and 180 minutes, respectively. Pseudo 2nd order kinetic and the Langmuir’s Models best described the kinetic and equilibrium behaviours, respectively.

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Kreuzer, H. J., and Jun Zhang. "Kinetic lattice gas model: Langmuir, Ising and interaction kinetics." Applied Physics A Solids and Surfaces 51, no. 3 (September 1990): 183–90. http://dx.doi.org/10.1007/bf00323999.

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Dong, Xiao Ping, Jie Fu, Jun Hao Jin, and Chen Chen. "Adsorption of Basic Dye in Aqueous Solution by Mesoporous Carbon Materials." Advanced Materials Research 441 (January 2012): 559–63. http://dx.doi.org/10.4028/www.scientific.net/amr.441.559.

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Mesoporous carbon CMK-3 with high surface area and opened pore structure was used to adsorb the basic dye, Malachite green (MG). The equilibrium adsorption data was well described by the Langmuir model, and a very high Langmuir adsorption capacity was obtained by this adsorbent. The adsorption kinetics was found to be best represented by a pseudo-second-order kinetic model.

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Mu, Jin Xia, Ming Juan Shi, Xiao Ying Wu, and Jin Ye Li. "Adsorptive Removal of Methylene Blue by Ginkgo Leaf Powder." Applied Mechanics and Materials 130-134 (October 2011): 829–32. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.829.

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The adsorption of methylene blue (MB) from aqueous solution using a low-cost adsorbent, ginkgo leaf powder, has been studied. The equilibrium data were fitted to Langmuir and Freundlich isotherms and the equilibrium adsorption was best described by the Langmuir isotherm model with maximum monolayer adsorption capacities found to be 39 mg/g. The sorption was analyzed using pseudo-first-order and pseudo-second order kinetic models, and the sorption kinetics was found to follow a pseudo-second order kinetic model. Ginkgo leaf appears as a prospective adsorbent for the removal of methylene blue from aqueous solution.

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Palastro, J. P., E. A. Williams, D. E. Hinkel, L. Divol, and D. J. Strozzi. "Kinetic dispersion of Langmuir waves. I. The Langmuir decay instability." Physics of Plasmas 16, no. 9 (September 2009): 092304. http://dx.doi.org/10.1063/1.3234245.

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Konicki, Wojciech, Małgorzata Aleksandrzak, and Ewa Mijowska. "Equilibrium and kinetics studies for the adsorption of Ni2+ and Fe3+ ions from aqueous solution by graphene oxide." Polish Journal of Chemical Technology 19, no. 3 (September 1, 2017): 120–29. http://dx.doi.org/10.1515/pjct-2017-0058.

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Abstract In this study, the adsorption of Ni2+ and Fe3+ metal ions from aqueous solutions onto graphene oxide (GO) have been explored. The effects of various experimental factors such as pH of the solution, initial metal ion concentration and temperature were evaluated. The kinetic, equilibrium and thermodynamic studies were also investigated. The adsorption rate data were analyzed using the pseudo-first-order kinetic model, the pseudo-second-order kinetic model and the intraparticle diffusion model. Kinetic studies indicate that the adsorption of both ions follows the pseudo-second-order kinetics. The isotherms of adsorption data were analyzed by adsorption isotherm models such as Langmuir and Freundlich. Equilibrium data fitted well with the Langmuir model. The maximum adsorption capacities of Ni2+ and Fe3+ onto GO were 35.6 and 27.3 mg g−1, respectively. In addition, various thermodynamic parameters, such as enthalpy (ΔHO), entropy (ΔSO) and Gibbs free energy (ΔGO), were calculated.

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Krishnaveni, S., and V. Thirumurugan. "A Study on Removal of Heavy Metal Chromium from Aqueous Chromium Solution Using Ipomoea carnea Root as Biosorbent." Journal of Drug Delivery and Therapeutics 9, no. 4-A (August 30, 2019): 409–14. http://dx.doi.org/10.22270/jddt.v9i4-a.3504.

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Pollution is the main problem due to heavy metal discharges from industries . In this study Ipomoea carnea (Family:Convolvulaceae) is selected to remove the heavy metal chromium from aqueous chromium solution using biosorbent . The present work focuses to evaluate the effectiveness of low cost absorbent Ipomoea carnea root powder. Various parameters like pH, biosorbent, dose, contact time and metal ion concentration are investigated using batch studies. A kinetic model study and isotherm model fitting study are studied using Langmuir and Freundlich isotherms. The Thermodyamic parameters ∆G, ∆H and ∆S are also seen. The results reveal that it follows pseudo first order kinetic model and also fit in the Langmuir and Freundlich isotherms. The results are very much encouraging. So, it can be used as low cost biosorbent in controlling the pollution. Keywords: Pollution, Heavy metal, chromium, Ipomoea carnea, Batch adsorption study, Kinetics Langmuir and Freundlich isotherms and Thermodynamic study.

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Baigenzhenov, Omirserik, Alibek Khabiyev, Brajendra Mishra, M. Deniz Turan, Merey Akbarov, and Tatyana Chepushtanova. "Uranium (VI) Recovery from Black Shale Leaching Solutions Using Ion Exchange: Kinetics and Equilibrium Studies." Minerals 10, no. 8 (July 31, 2020): 689. http://dx.doi.org/10.3390/min10080689.

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This work studies the removal of uranium ions from chemically leached solutions by sorption using two weak and two strong base anionites. Batch sorption experiments were performed to evaluate the optimum conditions at pH 1.2–2.2, 1.0 g resin dose for 1–12 h contact time at room temperature. These experiments addressed sorption kinetics and sorption isotherm. The maximum sorption capacity reached 55.8 mg/g at room temperature. The kinetics data are well described by the pseudo-second-order kinetic model at initial uranium concentration of 0.62 mg·L−1. To describe sorption kinetics pseudo-first-order, pseudo-second-order and intraparticle diffusion models were proposed. Studies indicated that the sorption of uranium can be fitted by a pseudo-second-order kinetic model very well. Equilibria were described by Langmuir, Freundlich, and Dubinin–Radushkevich equations. The experimental sorption isotherm is successfully described by the Langmuir model.

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Nahed, Naghmouchi, and Nahdi Kais. "Adsorption of textile dyes on raw Tunisian clay: Equilibrium, kinetics and thermodynamics." JOURNAL OF ADVANCES IN CHEMISTRY 11, no. 6 (September 16, 2015): 3685–97. http://dx.doi.org/10.24297/jac.v11i6.857.

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Natural clay from Nabeul region (north of Tunisia) was investigated for the removal of two anionic textile dyes (RR120 and BB150) from aqueous solution. The raw clay was characterized by means of XRD, IR spectroscopic, chemical analysis, cation exchange capacity and BET surface area analysis.Adsorption studies were carried out under various parameters such as pH, contact time, initial dye concentration and temperature. The adsorption kinetic data was tested by pseudo-first order, pseudo second-order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. The thermodynamic parameters (DH°, DS° and DG°) of the adsorption were also evaluated. The adsorption process was found spontaneous and endothermic in nature. The kinetics of adsorption were best described by pseudo-second order kinetic model. The Langmuir adsorption model totally agrees with the experimental data.

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Kuśmierek, Krzysztof, Paulina Idźkiewicz, Andrzej Świątkowski, and Lidia Dąbek. "Adsorptive removal of pentachlorophenol from aqueous solutions using powdered eggshell." Archives of Environmental Protection 43, no. 3 (September 1, 2017): 10–16. http://dx.doi.org/10.1515/aep-2017-0029.

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AbstractThe usefulness of untreated powdered eggshell as low-cost adsorbent for the removal of pentachlorophenol (PCP) from aqueous solutions was investigated. The most important parameters affecting the adsorption process, including the pH and ionic strength, were examined. The adsorption characteristics of PCP onto eggshell were evaluated in terms of kinetic and equilibrium parameters. The kinetic data were studied in terms of the pseudo-first order, pseudo-second order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using the Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. The pseudo-second order model best described the adsorption kinetics. Using the Langmuir equation, the monolayer adsorption capacity of eggshell for PCP was found to be 0.127 mg/g. The results showed that PCP can be effectively removed from aqueous solution employing eggshell as a cheap adsorbent.

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Більше джерел

Дисертації з теми "Langmuir kinetic"

Petzer, Adéle. "Kinetics of the photocatalytic reduction of platinum (IV) in a batch and flow reactor / Adéle Petzer." Thesis, North-West University, 2012. http://hdl.handle.net/10394/7612.

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Semiconductor photocatalysis has received considerable attention in recent years as an alternative for treating water polluted with hazardous organic chemicals. The process, as a means of removal of persistent water contaminants such as pesticides, which exhibit chemical stability and resistance to biodegradation, has attracted the attention of many researchers. To a lesser extent, it has also been studied for decontamination of water containing toxic metals. Precious and common metals enter waters through washing, rinsing, pickling and surface treatment procedures of industrial processes, such as hydrometallurgy, plating and photography. As a result we are living in an environment with a multitude of potentially harmful toxic metal ions. In contrast, the demand for metals increases significantly with the development and growth of industry. Even though research on the photocatalytic recovery of waste and noble metals has escalated in the past 10 years, the practical implementation of these processes is not yet justified. The successful implementation of large scale reactors, for industrial application, has to consider several reactor design parameters that must be optimised, such as reactor geometry and the utilization of radiated energy. In this study the effect of various parameters such as initial platinum(IV)chloride concentrations, initial sacrificial reducing agent (ethanol) concentrations, catalyst (TiO2) concentration, pH, temperature and light intensity has been investigated as a first step towards optimising a photocatalytic batch and photocatalytic flow reactor. Langmuir–Hinshelwood kinetics has been applied to calculate the photocatalytic rate constant kr as well as the adsorption equilibrium constant Ke for both the initial platinum(IV) dependency as well as the initial ethanol concentration dependency. The results in this study may be used in future work for the optimisation and comparison of both batch and flow reactors towards the industrial implementation of these processes.
Thesis (M.Sc. (Chemistry))--North-West University, Potchefstroom Campus, 2012.

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Berhane, Tedros Mesfin. "KINETIC AND EQUILIBRIUM SORPTION EXPERIMENTS INVESTIGATING PALYGORSKITE-MONTMORILLONITE AS A POTENTIAL FILTER MEDIUM FOR REMOVAL OF PHARMACEUTICALS AND ENDOCRINE-DISRUPTING COMPOUNDS." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1429882830.

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Stephens, Kenneth Frank. "Space-Charge Saturation and Current Limits in Cylindrical Drift Tubes and Planar Sheaths." Thesis, University of North Texas, 2000. https://digital.library.unt.edu/ark:/67531/metadc2598/.

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Space-charge effects play a dominant role in many areas of physics. In high-power microwave devices using high-current, relativistic electron beams, it places a limit on the amount of radiation a device can produce. Because the beam's space-charge can actually reflect a portion of the beam, the ability to accurately predict the amount of current a device can carry is needed. This current value is known as the space-charge limited current. Because of the mathematical difficulties, this limit is typically estimated from a one-dimensional theory. This work presents a two-dimensional theory for calculating an upper-bound for the space-charge limited current of relativistic electron beams propagating in grounded coaxial drift tubes. Applicable to annular beams of arbitrary radius and thickness, the theory includes the effect introduced by a finite-length drift tube of circular cross-section. Using Green's second identity, the need to solve Poisson's equation is transferred to solving a Sturm-Liouville eigenvalue problem, which is easily solved by elementary methods. In general, the resulting eigenvalue, which is required to estimate the limiting current, must be numerically determined. However, analytic expressions can be found for frequently encountered limiting cases. Space-charge effects also produce the fundamental collective behavior found in plasmas, especially in plasma sheaths. A plasma sheath is the transition region between a bulk plasma and an adjacent plasma-facing surface. The sheath controls the loss of particles from the plasma in order to maintain neutrality. Using a fully kinetic theory, the problem of a planar sheath with a single-minimum electric potential profile is investigated. Appropriate for single charge-state ions of arbitrary temperature, the theory includes the emission of warm electrons from the surface as well as a net current through the sheath and is compared to particle-in-cell simulations. Approximate expressions are developed for estimating the sheath potential as well as the transition to space-charge saturation. The case of a space-charge limited sheath is discussed and compared to the familiar Child-Langmuir law.

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Critchfield, Brian L. "Statistical Methods For Kinetic Modeling Of Fischer Tropsch Synthesis On A Supported Iron Catalyst." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1670.pdf.

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Benarouche, Anais. "Etude des interactions lipase-lipides au niveau d'interfaces modèles." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4791.

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Les enzymes lipolytiques sont solubles en phase aqueuse mais hydrolysent des substrats insolubles. Leurs activités lipolytiques dépendent donc fortement de l’organisation des substrats lipidiques présents sous forme de structures interfaciales telles que des émulsions, des micelles, des liposomes, ou des bicouches lipidiques. Les propriétés cinétiques et la spécificité de substrat de ces enzymes résultent de l’étape initiale d’adsorption à l’interface lipide-eau et des interactions entre le substrat et le site actif. Dans le cadre de ce travail de thèse, la technique des films monomoléculaires a été utilisée pour étudier en détail les étapes séquentielles d’adsorption, de catalyse et d’inhibition de l’enzyme à l’interface lipide-eau. Dans une première partie, nous avons réalisé la caractérisation physico-chimique de la lipase gastrique de chien (DGL), avec l’étude : de son adsorption sur un film non substrat de dilauroylphosphatidylcholine ; ‚ de l’hydrolyse interfaciale de la 1,2-dicaprine dans des films mixtes en présence d’Orlistat. Concernant l’étape de catalyse, nous avons étudié l’effet du propeptide sur la spécificité de substrat et l’activité interfaciale de la phospholipase A2 sécrétée de groupe X de souris. Enfin, dans une troisième partie, nous avons comparé les propriétés interfaciales de la lipase YLLIP2 de la levure Yarrowia lipolytica qui serait un bon candidat pour l’enzymothérapie de substitution chez les patients atteints d’insuffisance pancréatique exocrine (IPE), la lipase pancréatique humaine et la DGL. Nos résultats ont confirmé le rôle d’YLLIP2 en tant qu’excellent « substitut » non seulement de la HPL en cas d’IPE, mais aussi de la DGL
Lipolytic enzymes are water-soluble whereas their substrates are insoluble in water. Their lipolytic activities depend strongly on the organization of the lipid substrates present in interfacial structures such as oil-in-water emulsions, micelles, liposomes, and membrane bilayers. The kinetic properties and substrate specificity of these enzymes result from both their adsorption at the lipid-water interface, and the interactions occurring between the substrate and the active site. In this thesis work, the monomolecular film technique was used to study in details the sequential steps of adsorption, catalysis and inhibition of model enzymes at the lipid-water interface. In a first part, we performed the physico-chemical characterization of the dog gastric lipase (DGL), by studying: its adsorption onto a dilauroylphosphatidylcholine non-substrate film; ‚ its interfacial hydrolysis of 1,2-dicaprin in mixed films with various amounts of Orlistat. Regarding the catalysis step, we studied the effect of the propeptide on the substrate specificity and interfacial activity of the murine group X secreted phospholipase A2. A model of this enzyme with its propeptide was built from the available 3D structure of the corresponding mature human enzyme. Finally, in the third part, we compared the interfacial kinetic properties of YLLIP2 lipase of the yeast Yarrowia lipolytica which has been identified as a good candidate for enzyme replacement therapy for patients with exocrine pancreatic insufficiency (EPI), human pancreatic lipase and DGL. Our results confirmed the role of YLLIP2 as an excellent "substitute" not only for HPL in case of PEI, but also for the DGL at acidic pH values

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Wunder, Stefanie. "Synthesis, characterization and catalytic activity of immobilized metallic nanoparticles." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16752.

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In dieser Arbeit wurden Gold- und PlatinNanopartikel in sphärischen Polyelektolyt-Bürsten (SPB) synthetisiert. Diese wurden zu mechanistischen Untersuchungen der p-Nitrophenol-Reduktion mittels Natriumborhydrid herangezogen. Dabei konnte der Mechanismus der Reaktion auf der Oberfläche der Nanopartikel aufgeklärt werden. Die Reaktion folgt einem Langmuir Hinshelwood (LH) Mechanismus. Hierbei adsorbieren beide Edukte auf die Oberfläche, bevor sie im zu p-Aminophenol umgesetzt werden. Nach der Reaktion desorbiert das Reaktionsprodukt. Mittels des LH Modells konnten für verschiedene Temperaturen die intrinsische Geschwindigkeitskonstante, sowie die Adsorptionskonstanten der Edukte bestimmt werden. Mit diesen Daten konnten dann die Enthalpie und Entropie der Adsorption der Edukte und die Aktivierungsenergie berechnet werden. Neben dem Reaktionsmechanismus wurde die Induktionszeit der p-Nitrophenol Reduktion untersucht. Hierbei konnte gezeigt werden, dass diese Totzeit der Reaktion wahrscheinlich auf eine Restrukturierung der Nanopartikeloberfläche zurückzuführen ist. Sie ist unabhängig von den eingesetzten Konzentrationen des Borhydrids, hingegen abhängig von der Konzentration an p-Nitrophenol auf der Oberfläche der Nanopartikel, was auf Restrukturierung der Nanopartikel durch p-Nitrophenol hindeutet. Zudem wurden Hinweise auf eine spontane Rekonstruktion der Nanopartikel gefunden, die unabhängig von der Konzentration des p-Nitrophenols ist. Des Weiteren wurde die katalytische Oxidation von Morin mit Manganoxid Nanopartikeln untersucht. Diese sind in der Polyelektrolytschale der SPB immobilisiert. Analysen der Reaktionskinetik der Morin Oxidation ergaben, dass auch in diesem Fall der LH Mechanismus vorliegt. Hierbei konnten die Adsorptionskonstanten und Geschwindigkeitskonstanten für verschiedene Temperaturen ermittelt werden und somit die Aktivierungsenergie der Oxidation sowie die Adsorptionsenthalpie und Entropie der Edukte.
In this work, gold and platinum nanoparticles were synthesized into spherical polyelectrolyte brushes (SPB) in order to apply them as catalysts for kinetic studies of the reduction of p-nitrophenol by sodium borohydride. It was found that the reaction follows the Langmuir-Hinshelwood (LH) mechanism where both educts must adsorb onto the surface of the catalyst in order to react. Thereby, the rate determining step is the surface reaction of both educts. After the reaction, the product desorbs from the surface and a free active site is formed. With this model the intrinsic reaction rate and the adsorption constants for both educts could be determined. The measurements at different temperatures allowed the calculation of the activation energy and the adsorption enthalpy and entropy of the educts. Besides the reaction mechanism, the induction time of the reaction was analyzed. Here, it was shown that the reason of this delay time is a restructuring of the nanoparticle surface. The induction time is solely dependent on the concentration of p-nitrophenol on the surface of the nanoparticles and independent of the applied concentrations of borohydride. Moreover, hints for a spontaneous reconstruction of the nanoparticles without p-nitrophenol were found. In the second part, the catalytic oxidation of morin by manganese oxide has been studied. These nanoparticles were embedded inside the polyelectrolyte layer of the SPB. These nanoparticles were used for systematic studies of the oxidation of morin with hydrogen peroxide. It was shown that in this case the reaction followed a LH kinetics as well. Here, the intrinsic rate constants and the adsorption constants could be obtained for different temperatures. The activation energy and the adsorption enthalpy and entropy could be determined accordingly. The adsorption enthalpy is exothermic in both cases.

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Gu, Sasa. "Catalytic activity analysis of metallic nanoparticles by model reactions." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19297.

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In dieser Arbeit wurden zwei katalytische Modellreaktionen studiert. Zunächst die katalytische Reduktion von p-Nitrophenol (Nip) mit Natriumborhydrid (BH_4^-). Diese verläuft entlang der direkten Route: Dabei wird Nip über p-Hydroxylaminophenol (Hx) zum Produkt p-Aminophenol (Amp) reduziert. Ein kinetisches Modell wird vorgestellt, dass die Reaktion auf Basis des Langmuir-Hinshelwood (LH) Mechanismus beschreibt. Die Lösung der Gleichungen gibt die Nip Konzentration als Funktion der Zeit, welche direkt mit den experimentellen Daten verglichen werden kann. Werden als Katalysator auf sphärischen Polyeletrolytbürsten stabilisierte Gold Nanopartikel (SPB-Au) verwendet, zeigt sich eine gute Übereinstimmung und unterstreicht die Allgemeingültigkeit der direkten Route. Der zweite Teil beschäftigt sich mit der katalytischen Oxidation von 3,3’,5,5’-Tetramethylbenzidin (TMB) durch Wasserstoffperoxid (H_2O_2) an SPB-Pt Nanopartikeln. Dabei wurden die Katalyse mithilfe zweier Modelle analysiert: Michaelis-Menten (MM) und Langmuir-Hinshelwood (LH). Im MM Modell wird die Oxidation von TMB durch die Nanopartikel mit der Peroxidase katalysierten TMB Oxidation unter Annahme des Ping-Pong Mechanismus verglichen. Es wurde gezeigt, dass die häufig verwendete Analyse der initialen Reaktionsraten große Fehler verursacht und zu inkonsistenten Ergebnissen führt. Dies zeigt dass dieses Vorgehen zu Analyse der Oxidation von TMB nicht geeignet ist. Im LH Modell wird angenommen dass H_2O_2 und TMB im ersten Schritt auf der Oberfläche der Nanopartikel adsorbieren. Das LH Modell mit Produktinhibition ermöglicht hierbei eine zufriedenstellende Beschreibung der kinetischen Daten bis zu einem Umsatz von 40 %. Die gesamte Analyse zeigt, dass das Langmuir-Hinshelwood Modell die bessere Näherung zur Beschreibung der Kinetik der Nanopartikel katalysierten TMB Oxidation bietet
In this work, two catalytic model reactions were studied using different metallic nanoparticles in aqueous solution. One is the catalytic reduction of p-nitrophenol (Nip) by sodium borohydride (BH_4^-). The reaction proceeds in the following route: Nip is first reduced to p-hydroxylaminophenol (Hx) which is further reduced to the final product p-aminophenol (Amp). Here we present a full kinetic scheme according to Langmuir-Hinshelwood mechanism (LH). The solution of the kinetic equations gives the concentration of Nip as the function of time, which can be directly compared with the experimental data. Satisfactory agreement is found for reactions catalyzed by Au nanoparticles immobilized in spherical polyelectrolyte brushes (SPB-Au) verifying the validity of the reaction route. In the second part, we present a study on the catalytic oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) by hydrogen peroxide (H_2O_2) with SPB-Pt nanoparticles. The catalysis was analyzed by two different models: Michaelis-Menten (MM) and Langmuir-Hinshelwood (LH) model. In the MM model, the oxidation of TMB catalyzed by nanoparticles is inferred to the catalysis of peroxidase assuming the Ping-Pong mechanism. It is found that the frequently used analysis with the initial rates introduces large errors and leads to inconsistent results, which indicates that such approach is not suitable to analyze the oxidation of TMB catalyzed by nanoparticles. In the LH model, it is assumed that H_2O_2 and TMB adsorb on the surface of nanoparticles in the first step. The LH model with product inhibition gives satisfactory description of the kinetic data up to a conversion of 40%. The entire analysis demonstrates that the Langmuir-Hinshelwood model provides a superior approach to describe the kinetics of TMB oxidation catalyzed by nanoparticles.

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Brady, James Peter. "An examination of the applicability of hydrotalcite for removing oxalate anions from Bayer process solutions." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46165/1/James_Brady_Thesis.pdf.

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Hydrotalcite and thermally activated hydrotalcites were examined for their potential as methods for the removal of oxalate anions from Bayer Process liquors. Hydrotalcite was prepared and characterised by a number of methods, including X-ray diffraction, thermogravimetric analysis, nitrogen adsorption analysis and vibrational spectroscopy. Thermally activated hydrotalcites were prepared by a low temperature method and characterised using X-ray diffraction, nitrogen adsorption analysis and vibrational spectroscopy. Oxalate intercalated hydrotalcite was prepared by two methods and analysed with X-ray diffraction and for the first time thermogravimetric analysis, Raman spectroscopy and infrared emission spectroscopy. The adsorption of oxalate anions by hydrotalcite and thermally activated hydrotalcite was tested in a range of solutions using both batch and kinetic adsorption models.

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Vezzoli, Massimiliano. "Intrinsic kinetics of titania photocatalysis : simplified models for their investigation." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/51574/1/Massimiliano_Vezzoli_Thesis.pdf.

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Even though titanium dioxide photocatalysis has been promoted as a leading green technology for water purification, many issues have hindered its application on a large commercial scale. For the materials scientist the main issues have centred the synthesis of more efficient materials and the investigation of degradation mechanisms; whereas for the engineers the main issues have been the development of appropriate models and the evaluation of intrinsic kinetics parameters that allow the scale up or re-design of efficient large-scale photocatalytic reactors. In order to obtain intrinsic kinetics parameters the reaction must be analysed and modelled considering the influence of the radiation field, pollutant concentrations and fluid dynamics. In this way, the obtained kinetic parameters are independent of the reactor size and configuration and can be subsequently used for scale-up purposes or for the development of entirely new reactor designs. This work investigates the intrinsic kinetics of phenol degradation over titania film due to the practicality of a fixed film configuration over a slurry. A flat plate reactor was designed in order to be able to control reaction parameters that include the UV irradiance, flow rates, pollutant concentration and temperature. Particular attention was paid to the investigation of the radiation field over the reactive surface and to the issue of mass transfer limited reactions. The ability of different emission models to describe the radiation field was investigated and compared to actinometric measurements. The RAD-LSI model was found to give the best predictions over the conditions tested. Mass transfer issues often limit fixed film reactors. The influence of this phenomenon was investigated with specifically planned sets of benzoic acid experiments and with the adoption of the stagnant film model. The phenol mass transfer coefficient in the system was calculated to be km,phenol=8.5815x10-7Re0.65(ms-1). The data obtained from a wide range of experimental conditions, together with an appropriate model of the system, has enabled determination of intrinsic kinetic parameters. The experiments were performed in four different irradiation levels (70.7, 57.9, 37.1 and 20.4 W m-2) and combined with three different initial phenol concentrations (20, 40 and 80 ppm) to give a wide range of final pollutant conversions (from 22% to 85%). The simple model adopted was able to fit the wide range of conditions with only four kinetic parameters; two reaction rate constants (one for phenol and one for the family of intermediates) and their corresponding adsorption constants. The intrinsic kinetic parameters values were defined as kph = 0.5226 mmol m-1 s-1 W-1, kI = 0.120 mmol m-1 s-1 W-1, Kph = 8.5 x 10-4 m3 mmol-1 and KI = 2.2 x 10-3 m3 mmol-1. The flat plate reactor allowed the investigation of the reaction under two different light configurations; liquid and substrate side illumination. The latter of particular interest for real world applications where light absorption due to turbidity and pollutants contained in the water stream to be treated could represent a significant issue. The two light configurations allowed the investigation of the effects of film thickness and the determination of the catalyst optimal thickness. The experimental investigation confirmed the predictions of a porous medium model developed to investigate the influence of diffusion, advection and photocatalytic phenomena inside the porous titania film, with the optimal thickness value individuated at 5 ìm. The model used the intrinsic kinetic parameters obtained from the flat plate reactor to predict the influence of thickness and transport phenomena on the final observed phenol conversion without using any correction factor; the excellent match between predictions and experimental results provided further proof of the quality of the parameters obtained with the proposed method.

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Gustafson, Inga. "Phospholipid membranes in biosensor applications : Stability, activity and kinetics of reconstituted proteins and glycolipids in supported membranes." Doctoral thesis, Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-172.

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Книги з теми "Langmuir kinetic"

Frenzen, Christopher L. A comment on the derivation of the Langmuir isotherm for the adsorption kinetics. Monterey, Calif: Naval Postgraduate School, 1991.

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Частини книг з теми "Langmuir kinetic"

Lowell, S., and Joan E. Shields. "Langmuir and BET theories (kinetic isotherms)." In Powder Surface Area and Porosity, 14–29. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7955-1_4.

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Baleanu, Dumitru, Yeliz Yolcu Okur, Salih Okur, and Kasim Ocakoglu. "Parameter Identification of the Langmuir Model for Adsorption and Desorption Kinetic Data." In Nonlinear and Complex Dynamics, 97–106. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0231-2_7.

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Tsytovich, Vadim N. "Dissipative Structures and Strong Langmuir Turbulence." In Lectures on Non-linear Plasma Kinetics, 247–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-78902-1_10.

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Gupta, Arvind Kumar. "Two-Channel Partially Coupled Exclusion Process with Mutually Interactive Langmuir Kinetics." In Traffic and Granular Flow '15, 629–36. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-33482-0_79.

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Oparin, V. N., та T. A. Kiryaeva. "Operator of Connection Between the Langmuir Equation and Oparin’s Kinematic Equation for Pendulum-Type Waves. Part II". У Proceeding of the International Science and Technology Conference "FarEastСon 2021", 15–29. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8829-4_2.

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Oparin, V. N., та T. A. Kiryaeva. "Operator of Connection Between the Langmuir Equation and Oparin’s Kinematic Equation for Pendulum-Type Waves. Part I". У Proceeding of the International Science and Technology Conference "FarEastСon 2021", 1–13. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8829-4_1.

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Oparin, V. N., та T. A. Kiryaeva. "Operator of Connection Between the Langmuir Equation and Oparin’s Kinematic Equation for Pendulum-Type Waves. Part III". У Proceeding of the International Science and Technology Conference "FarEastСon 2021", 31–43. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8829-4_3.

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Yanagisawa, Daichi, and Shingo Ichiki. "Totally Asymmetric Simple Exclusion Process on an Open Lattice with Langmuir Kinetics Depending on the Occupancy of the Forward Neighboring Site." In Lecture Notes in Computer Science, 405–12. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-44365-2_40.

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"Langmuir Turbulence and Electron Kappa Distribution." In Classical Kinetic Theory of Weakly Turbulent Nonlinear Plasma Processes, 122–52. Cambridge University Press, 2019. http://dx.doi.org/10.1017/9781316771259.009.

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Abderrahim, Kali, Loulidi Ilyasse, Amar Abdelouahed, Boukhlifi Fatima, Hadey Chaimaa, Jabri Maria, and Mbarka Ouchabi. "Exploitation of Bentonite for Wastewater Treatment." In Montmorillonite Clay. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.100013.

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Bentonite is a clay with interesting surface properties (affinity for water, adsorption capacity for electro-positive compounds….). The characteristics and clarifying properties of bentonite from various companies are the subject of numerous studies. The present work focuses on the study of the efficiency of bentonite and modified bentonite to purify aqueous solutions containing organic pollutants such as phenol. First, before starting the adsorption study, a physical–chemical characterization of the clay by FTIR, BET and XRD techniques was undertaken. The specific surface of the bentonite is calculated by BET. Then, the study of isotherms and kinetics of phenol adsorption on commercial BTC showed that this pollutant can be removed from liquid effluents with a significant percentage. Langmuir and Freundlich models were applied. Finally, the kinetic study performed by UV–Visible was reproduced by FTIR spectroscopy.

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Тези доповідей конференцій з теми "Langmuir kinetic"

Dorozhkin, Nick N., Alexander I. Drapeza, Halina V. Grushevskaya, and George G. Krylov. "Kinetic theory of conductivity for Fe-containing nanostructured Langmuir-Blodgett thin films." In Optical Science and Technology, the SPIE 49th Annual Meeting, edited by Akhlesh Lakhtakia and Sergey A. Maksimenko. SPIE, 2004. http://dx.doi.org/10.1117/12.559676.

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Gokon, Nobuyuki, Yusuke Osawa, Daisuke Nakazawa, Tsuyoshi Hatamachi, and Tatsuya Kodama. "Kinetics of CO2 Reforming of Methane by Catalytically Activated Metallic Foam Absorber for Solar Receiver-Reactors." In ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54156.

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Ni-Cr-Al alloy foam absorber with high porosity was catalytically activated using a Ru/γ-Al2O3 catalyst, and was subsequently tested with respect to CO2 reforming of methane in a small-scale volumetric receiver-reactor by using a sun simulator. A chemical storage efficiency of about 40% was obtained for a mean light flux of 325 kWm−2. Furthermore, the activity and the stability of the metallic foam absorber were compared with those of a SiC foam absorber activated with the same Ru/γ-Al2O3 catalyst for 50 h of light irradiation, and it was found that the metallic foam absorber has superior catalytic stability in comparison to the SiC form absorber. In addition, unlike ceramic foams such as SiC, metallic foams feature superior plasticity, which prevents the emergence of cracks caused by mechanical or thermal shock. The kinetics of CO2 reforming of methane over metallic foam absorbers were also examined for temperatures of 600–750°C using a quartz tube reactor and an electric furnace. The experiments were performed by varying the methane/CO2 ratios of 0.5–2.3. Moreover, the kinetic data were fitted to four different types of kinetic models, namely the Langmuir-Hinshelwood, Basic, Eley-Rideal, and Stepwise mechanisms. The kinetic model which provided the best prediction of the experimental reforming rates was the Langmuir-Hinshelwood mechanism.

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Appadu, A. R. "Comparative study of three numerical schemes for contaminant transport with Kinetic Langmuir Sorption." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS 2015 (ICNAAM 2015). Author(s), 2016. http://dx.doi.org/10.1063/1.4951777.

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Alsaba, Wisam Hussam, Raafat Alenany, and Mohammed Zamzam. "Using Synthetic Resins for Removal of Emulsified Oil from Produced Water." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0103.

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In this study, adsorption of emulsified oil in produced water was experimented using synthetic resins. Adsorbent dosage, contact time, initial oil concentration, and PH were the main key parameters evaluated for Optipore L493, Amberlite IRA 958, Amberlite XAD 7 and Lewatit AF 5. Oil removal rates have reached up to 98% using AF 5, XAD 7 and L493, while they are lesser than 25% for IRA 958. Isotherm data were fitted using Langmuir, Freundlich, Toth, Flory Huggins and Dubinin-Radushkevich models. Adsorption isotherms for XAD 7 and L 493 were best fitted using Langmuir model, whereas AF 5 curves were best fitted using Dubinin-Radushkevich. Kinetic data describing the rate of adsorption for each resin were studied and fitted using pseudo-first and second order equations in addition to intraparticle diffusion models. The experimental results were best-fitted using pseudo second order kinetics. The obtained results confirm the applicability of the resins for the removal of oil from produced water.

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Drofa, M. A., I. M. Aleshin, and L. S. Kuzmenkov. "Kinetic theory of strongly nonlinear stationary Langmuir waves (T/spl Lt/mc/sup 2/)." In International Conference on Plasma Science (papers in summary form only received). IEEE, 1995. http://dx.doi.org/10.1109/plasma.1995.531721.

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Cajucom, Ernesto Jr S., and Lolibeth V. Figueroa. "SURFACE MODIFICATION OF CANARIUM OVATUMENGL.(PILI) SHELL AS ADSORBENT OF LEAD(Pb2+) FROM AQUEOUS SOLUTION." In International Trends in Science and Technology. RS Global Sp. z O.O., 2021. http://dx.doi.org/10.31435/rsglobal_conf/30032021/7476.

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This study was carried out to investigate the efficiency of raw pili shell (RPS) and the surface modified pili shell using EDTA (EMPS) and oxalic acid (OMPS). A comparative study on the adsorption capacity of the adsorbents was performed against lead (Pb2+) from aqueous solution. The adsorbents were characterized by FTIR, which showed higher peak of adsorption bands of carboxylic groups on the acid modified pili shells. Scanning electron microscope orSEM was also used to describe the surface morphology of the adsorbents. The linear form of Langmuir and Freundlich models were applied to represent adsorption data. The calculated equilibrium data of Pb (II) best fitted to Langmuir compare to Freundlich isotherm model with maximum adsorption capacity (qmax) of 27.03 mg/g and 45.45 mg/g using EMPS and OMPS, respectively. Kinetic sorption models were used to determine the adsorption mechanism and the kinetic data of all the adsorbents correlated (R2=1) wellwith the pseudo second order kinetic model. Among the three adsorbents, OMPS shown higher percent removal of lead compared to RPS and EMPS. The large adsorption capacity rate indicated that chemically modified pili shell in present study has great potential to be used as a cost-effective adsorbent for the removal of lead ions from the water.

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Basu, Sumit, Yuan Zheng, and Jay P. Gore. "Chemical Kinetics Parameter Estimation for Ammonia Borane Hydrolysis." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56139.

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Onboard hydrogen storage is an enabling factor in the development of fuel cell powered passenger cars. Ammonia borane (AB) hydrolysis is one of the potential technologies for onboard hydrogen storage. In this study, kinetics of catalyzed ammonia borane hydrolysis using ruthenium-supported-on-carbon has been measured. For reacting flows, chemical kinetics determines the rates of heat generation and species production or consumption in the overall energy and mass balances respectively. Kinetic measurements under isothermal conditions provide critical data for the design of hydrolysis reactors. It is, however, not always possible to eliminate the effects of internal diffusion in a heterogeneous chemical reaction. In such cases, the reaction efficiency (η), which depends on the effective liquid phase diffusivity (Deff) in the catalyst medium, should be determined. Determination of intrinsic kinetic parameters using apparent kinetics data is, thus, a challenge. In this study, the change in AB concentration (CAB) with reaction time (t) has been directly measured. It was observed that the AB hydrolysis reaction had orders between zero and one in a temperature range of 26°C to 55°C. A unified Langmuir-Hinshelwood (LH) model has been adopted to describe the reaction kinetics. The intrinsic kinetic parameters (A, Ea, ΔHads, K0) as well as Deff need to be estimated by inverse analysis of the measured CAB vs t data. Conventionally, kinetic parameters are determined using linear fitting. Sometimes, however, it is impossible to converge to a unique value by using the linear fitting approach as there are several values providing regression coefficients greater than 0.99. In this study, the multiple-variable inverse problem has been solved using a nonlinear fitting algorithm based on Powell’s conjugate-gradient error minimization. This algorithm minimizes errors without using derivatives. As a result, the uncertainties in the kinetic parameter estimation have been significantly reduced by the new approach.

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Seniūnaitė, Jurgita, Rasa Vaiškūnaitė, and Kristina Bazienė. "Mathematical Modelling for Copper and Lead Adsorption on Coffee Grounds." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.007.

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Research studies on the adsorption kinetics are conducted in order to determine the absorption time of heavy metals on coffee grounds from liquid. The models of adsorption kinetics and adsorption diffusion are based on mathe-matical models (Cho et al. 2005). The adsorption kinetics can provide information on the mechanisms occurring be-tween adsorbates and adsorbents and give an understanding of the adsorption process. In the mathematical modelling of processes, Lagergren’s pseudo-first- and pseudo-second-order kinetics and the intra-particle diffusion models are usually applied. The mathematical modelling has shown that the kinetics of the adsorption process of heavy metals (copper (Cu) and lead (Pb)) is more appropriately described by the Lagergren’s pseudo-second-order kinetic model. The kinetic constants (k2Cu = 0.117; k2Pb = 0,037 min−1) and the sorption process speed (k2qeCu = 0.0058–0.4975; k2qePb = 0.021–0.1661 mg/g per min) were calculated. After completing the mathematical modelling it was calculated that the Langmuir isotherm better reflects the sorption processes of copper (Cu) (R2 = 0.950), whilst the Freundlich isotherm – the sorption processes of lead (Pb) (R2 = 0.925). The difference between the mathematically modelled and experimen-tally obtained sorption capacities for removal of heavy metals on coffee grounds from aqueous solutions is 0.059–0.164 mg/l for copper and 0.004–0.285 mg/l for lead. Residual concentrations of metals in a solution showed difference of 1.01 and 0.96 mg/l, respectively.

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Han, Runping, Yinli Li, Jingjing Zhang, Lijun Zhang, Fuling Xie, Junmei Cheng, and Zhenhui Zhao. "Langmuir Isotherm and Pseudo Second Order Kinetic Model for the Biosorption of Methylene Blue Onto Rice Husk." In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.389.

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Sallom, Audai, and A. E. Khadzhidi. "METHOD FOR REMOVING NITRATES FROM WATER WATER SUPPLY SYSTEMS." In STATE AND DEVELOPMENT PROSPECTS OF AGRIBUSINESS Volume 2. DSTU-Print, 2020. http://dx.doi.org/10.23947/interagro.2020.2.180-182.

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To remove nitrates from the water of water supply systems, the polyvinyl / chitosan compound (PVA / CS) was studied. Optimal conditions for the absorption of nitrates on PVA / CS were investigated using antisurfaces. The results of the study showed that the mixture of polymers PVA / chitosan CS is an effective absorbent material for removing nitrates from water: the maximum concentration of solid phase nitrate was 0.5 mg / g at a pH in the range from 3 to 6; contact time was 70 minutes at a dose of adsorbent 2 g / l. These conditions were applied to the study of the equilibrium and kinetic adsorption of nitrates on (PVA / CS). Adsorption data are described by Langmuir and Freindlich models. The maximum concentration of solid phase nitrate calculated by the Langmuir model for (PVA / CS) was 92.59 mg / L. Nitrate mobility was analyzed on pseudo-adsorbents of the second pseudo-class, this relates to the nature of chemical adsorption.

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