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Academic literature on the topic 'Adsorption kinetics and isotherms'

Author: Grafiati

Published: 7 June 2025

Last updated: 16 July 2025

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Journal articles on the topic "Adsorption kinetics and isotherms"

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Wang, Jianhong, Qi Zhang, Hao Yang, and Congzhen Qiao. "Adsorptive Desulfurization of Organic Sulfur from Model Fuels by Active Carbon Supported Mn (II): Equilibrium, Kinetics, and Thermodynamics." International Journal of Chemical Engineering 2020 (June 16, 2020): 1–12. http://dx.doi.org/10.1155/2020/2813946.

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Mn (II)/AC adsorbents were prepared by ultrasonic impregnation. The 2 wt. % Mn/AC showed best adsorptive performance, and the optimal adsorption temperature was 313 K. Benzene, methylbenzene, and naphthalene were used to explore the adsorptive selectivity of Mn/AC, indicating that Mn could enhance the adsorptive capacity but could not improve the adsorptive selectivity. The adsorptive mechanism was mostly like to be π-complex. Adsorptive isotherms and kinetics were investigated, and the parameters were calculated. The R2, RMSE, and AICc were used to assess the optimal model. The results showed that Temkin adsorptive isotherm was more suitable to describe the isothermal data; the MPnO kinetics model was more superior to other kinetic models. The order of reaction was between 1 and 2. The outcome of adsorptive thermodynamics indicated that removal of DBT onto Mn/AC was a spontaneous and exothermic process.

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Ammar, Saad H., and Sama Ali Jaafar. "Adsorption Kinetic and Isotherms Studies of Thiophene Removal from Model Fuel on Activated Carbon Supported Copper Oxide." Iraqi Journal of Chemical and Petroleum Engineering 18, no. 2 (2017): 83–93. http://dx.doi.org/10.31699/ijcpe.2017.2.7.

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In the present study, activated carbon supported metal oxides was prepared for thiophene removal from model fuel (Thiophene in n-hexane) using adsorptive desulfurization technique. Commercial activated carbon was loaded individually with copper oxide in the form of Cu2O/AC. A comparison of the kinetic and isotherm models of the sorption of thiophene from model fuel was made at different operating conditions including adsorbent dose, initial thiophene concentration and contact time. Various adsorption rate constants and isotherm parameters were calculated. Results indicated that the desulfurization was enhanced when copper was loaded onto activated carbon surface. The highest desulfurization percent for Cu2O/AC and origin AC at initial thiophene concentration of 500 ppm, adsorbent dose of 0.01 g/ml and equilibrium time of 5 hr were 87.4% and 53.4% respectively, for outlet concentration of 63 mg/L for copper oxide and 236 mg/L for original AC. Generally, the percent removal of thiophene increases with the increase in adsorbent dose and decrease with increase in initial thiophene concentration. The present study was mainly focusing on the kinetics and adsorption isotherms aspect; adsorption kinetics of thiophene onto activated carbon supported Cu2O adsorbent was closely represented by the second order kinetic model and Freundlich isotherms well represented the equilibrium adsorption of thiophene from model fuel.

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Samarghandy, Mohammad Reza, Edris Hoseinzade, Mahmood Taghavi, and Saman Hoseinzadeh. "Biosorption of Reactive Black 5 from aqueous solution using acid-treated biomass from potato peel waste." BioResources 6, no. 4 (2011): 4840–55. http://dx.doi.org/10.15376/biores.6.4.4840-4855.

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The goal of this study was to survey the feasibility of the biosorption of Reactive Black 5 (RB5) from aqueous solutions using biomass prepared from potato peel waste. Adsorption isotherms were constructed, and the kinetics of dye adsorption were studied. Langmuir and Freundlich isotherms were constructed, and pseudo-first order, pseudo-second order, and modified pseudo-first order kinetic models were studied. Maximum adsorption (85.5%) was observed at a pH of 3, and uptake decreased with increasing pH. The biosorption of RB5 increased with increasing contact time and reached equilibrium after two hours. RB5 removal efficiency decreased with an increase in the initial dye concentration, but the uptake of dye increased. Adsorption data conformed to the Langmuir isotherm model and pseudo-first order kinetics.

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Heraldy, Eddy, Sri Juari Santosa, Triyono Triyono, and Karna Wijaya. "Anionic and Cationic Dyes Removal from Aqueous Solutions by Adsorption onto Synthetic Mg/Al Hydrotalcite-Like Compound." Indonesian Journal of Chemistry 15, no. 3 (2015): 234–41. http://dx.doi.org/10.22146/ijc.21190.

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The current investigation reports an effective adsorption of both anionic species and cationic dyes on Mg/Al hydrotalcite-like compounds (Mg/Al HTlc) synthetic from brine water, as novel, inexpensive available alternative to the commercial hydrotalcite. The feasibility of the Mg/Al HTlc, for the adsorptive removal of both anionic (Eosin Yellow-EY and Methyl Orange-MO) and cationic (Methylene blue-MB) dyes from aqueous solution was evaluated in a batch process. Dyes adsorption process was thoroughly studied from both kinetic and equilibrium points of view for all adsorbents. The adsorption kinetics was tested for the pseudo-first order and pseudo-second order kinetic models at different experimental conditions. The dyes adsorption follows the pseudo-second order kinetics model, with correlation coefficients close to unity when experimental data were fitted in the model. The experimental isotherm data were analyzed using Langmuir and Freundlich isotherms. The results from Langmuir isotherm indicated that the capacity of Mg/Al HTlc for the adsorption of anionic dyes was higher than that for cationic dyes.

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Tay, Turgay, Murat Erdem, Burak Ceylan, and Selhan Karagöz. "Adsorption of methylene blue from aqueous solution on activated carbon produced from soybean oil cake by KOH activation." BioResources 7, no. 3 (2012): 3175–87. http://dx.doi.org/10.15376/biores.7.3.3175-3187.

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This study presents the adsorption behavior of the methylene blue (MB) dye onto the activated carbon produced from soybean oil cake by chemical activation with KOH at 800 °C. The adsorption isotherms, kinetic models, and thermodynamic parameters of the adsorption were studied. The Langmuir isotherm showed a better fit than the Freundlich isotherm. The adsorption rate was described by pseudo-second-order kinetics. The negative values of ΔG° and the positive values of ΔH° indicate that the adsorption of MB was favored and endothermic.

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Zor, Sibel. "Investigation of the adsorption of anionic surfactants at different pH values by means of active carbon and the kinetics of adsorption." Journal of the Serbian Chemical Society 69, no. 1 (2004): 25–32. http://dx.doi.org/10.2298/jsc0401025z.

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In this study, the effect of pH on the removal of anionic surfactants, such as linear alkyl benzene sulfonate (LABS) and dodecyl benzene sulfonate (DBS) bymeans of adsorption by activated carbon was investigated. For this purpose activated carbon was used as adsorbent. Anionic surfactant solutions with initial pH values of 3, 6, 8 and 12 were used. The adsorption isotherms for the adsorption of anionic surfactants by active carbon at different pH were determined. These adsorption isotherms were seen to be consistent with Freundlich?s adsorption isotherm. k and n constants were determined from Freundlich?s linear equation. Adsorption rate constants were determined from the obtained kinetic curves which were suitable for the first order of rate kinetics.

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Berez, A., F. Ayari, N. Abidi, G. Schäfer, and M. Trabelsi-Ayadi. "Adsorption-desorption processes of azo dye on natural bentonite: batch experiments and modelling." Clay Minerals 49, no. 5 (2014): 747–63. http://dx.doi.org/10.1180/claymin.2014.049.5.10.

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AbstractThe purpose of this study was to determine whether a bentonite from the Gafsa deposit (western Tunisia) could be used to remove the Foron Blue 291 (FB) azo dye from wastewater. Batch adsorption and desorption experiments were conducted using untreated and purified bentonite and the influence of contact time, pH, adsorbent mass and temperature of the dye solution on the adsorption of FB was evaluated. Kinetic and isotherm data were fitted using two non-linear kinetic and two non-linear isotherm equations. In addition, the fits were evaluated using the coefficient of determination (R2) and the RMSE. The percentage of dye removal increased with increasing amount of adsorbent until total discolouration was achieved. The adsorption isotherms followed the Langmuir model, with the purified bentonite having a higher adsorption capacity than the raw material due to its higher specific surface area. In addition, the FB molecules were removed from the liquid medium by physical adsorption. Batch desorption experiments were conducted to study the desorption kinetics and the characteristics of the desorption isotherms as well as to quantify the portion of the FB (by mass) that was irreversibly fixed on the solid. Overall, the desorption kinetics were similar to the adsorption kinetics, which indicated that the adsorption-desorption process of azo dye is non-singular; irreversibility occurred that was underlined by an observed thermodynamic index of irreversibility (TII) of 0.69–0.94. The desorption isotherms of the FB depended on the mass of the FB that was initially adsorbed on the bentonite sample, suggesting hysteresis. The amount of irreversibly retained FB was between 46 and 68% of the initial adsorbed mass.

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Luo, Li Jun, Ping Bao Ban, Xue Jiao Huang, and Jun Hong Li. "Functionalized Mesporous Silica with Ethylenediamine for Removal of Pb(II)." Applied Mechanics and Materials 395-396 (September 2013): 610–14. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.610.

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Amine-functionalized mesporous silicas ((referred as NH2MS)) were synthesized by grafting with ethylenediamine. The obtained materials have been characterized by N2 adsorption desorption measurement (BET). Adsorption behaviors of the adsorbent for lead (containing effects factors, kinetics, isotherms, thermodynamics) were investigated. The result indicated that the obtained particles possessed mesoporous structrure. The Pb (II) adsorption isotherm and kinetic data fit Freundlich model and the pseudo second-order kinetic model respectively. the adsorption of Pb (II) onto NH2-MS was an enothermic nature.

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He, Hua Ling, Zhi Cai Yu, and Peng Liang. "Adsorption of Acid Red G Dye from Solutions by Raw Bentonite and Bentonite-Cationic Starch Composite." Advanced Materials Research 821-822 (September 2013): 540–44. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.540.

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The adsorption of acid red G dye onto raw bentonite/cationic starch (RB/CS) and raw bentonite (RB) was investigated in aqueous solution in a bath system with respect to the adsorption kinetics and adsorption isotherms, respectively. For RB and RB/CS composite, the kinetic data showed that the kinetics of adsorption was best described by a pseudo-second-order expression than the pseudo-first-order. Adsorption isotherms of acid red G dye onto RB and RB/CS composite were determined with common isotherm equations such as the Langmuir and Freundlich models. The results showed that for RB/CS composite, the Langmuir model agreed very well with the experimental data, whereas the RB was fitted to both Langmuir and Freundlich models. In summary, the results showed that RB/CS could be employed as low-cost materials for the removal of acid red G dye from effluents compared to RB.

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Usman, A., S. O. Osuegba, and S. Mamman. "Deep Eutectic Solvent-Magnetite Hybrid Composite for Effective Removal of Zinc (II) Ions from Industrial Wastewater." Journal of Applied Sciences and Environmental Management 28, no. 9 (2024): 2831–37. http://dx.doi.org/10.4314/jasem.v28i9.27.

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Zinc is one of the important trace element, but its high amount in aquatic bodies is detrimental to health. Hence, the objective of this paper was to synthesize deep eutectic solvent (DES) nanoparticles and evaluate their adsorption behavior for the removal of zinc (II) ions from industrial wastewater using appropriate standard techniques. The pseudo-first-order and pseudo-second-order models were utilised to investigate the adsorption kinetics, and the Freundlich and Langmuir isotherms were employed to assess the adsorption isotherms. The results of the kinetic study shows that the adsorption process follows the Langmuir isotherm model (0.9740) and pseudo-second-order kinetics (0.9186). At pH 7 and room temperature, the highest adsorption capacity was determined to be 22.883 mg/g. These findings indicate that DES nanoparticles may be a promising, highly effective, and ecologically benign adsorbent for extracting zinc (II) ions from wastewater.

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Dissertations / Theses on the topic "Adsorption kinetics and isotherms"

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Tayal, R. K. "Hydrophilic acrylics: polymerisation kinetics, adsorption/ desorption isotherms." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2013. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2178.

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Enarsson, Lars-Erik. "Polyelectrolyte adsorption on oppositely charged surfaces - Conformation and adsorption kinetics." Licentiate thesis, Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4059.

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Forshaw, Paula Louise. "Kinetic studies of probe molecule adsorption on activated carbons." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324940.

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PETRONI, SERGIO L. G. "Avaliacao cinetica e de equilibrio do processo de adsorcao dos ions dos metais cadmio, cobre e niquel em turfa." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11138.

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Made available in DSpace on 2014-10-09T12:48:47Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:01:16Z (GMT). No. of bitstreams: 1 09620.pdf: 6546860 bytes, checksum: eb65a0c5c525fc6fd0305ce23a55fd85 (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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Pathiraja, Inoka Kumari. "Removal of Acid Yellow 25 Dye onto Chitin Extracted from Waste Crab legs and Study of Adsorption Isotherms and Kinetics of AY25 Dye Adsorption." Thesis, Southern Illinois University at Edwardsville, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1565520.

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<p> Acid Yellow 25 (AY25) is used in the textile industry for dyeing of natural fibers as well as synthetic fibers. To a lesser extent, it is also used as a coloring agent in paints, inks, plastics, and leather. Effluents from such industries are major sources of water pollution. Dyes in wastewater are difficult and costly to remove since they are stable to oxidizing agents and light. Hence, it is important to find simple, efficient, and inexpensive ways to remove the dyes from wastewater. The objective of this study is to determine the suitability of chitin extracted from waste crab legs as an adsorbent for removing AY25 dye. Purified chitin was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray powder diffraction methods. Batch adsorption experiments were performed to determine the effect of adsorbent dosage and initial dye concentration on percentage dye removal. </p><p> The adsorption kinetics were modeled using the pseudo-first order, pseudo-second order, and intra particle diffusion equations to determine the rate controlling step. Results showed that the pseudo-second order adsorption mechanism is predominant, and the overall rate of dye adsorption process is therefore controlled by adsorption reaction.</p><p> Adsorption data were analyzed using Langmuir, Freundlich, D-R and Temkin isotherm models at 23°C using various initial dye concentrations with different chitin dosages. Equilibrium data were fitted well with the Langmuir, Freundlich and D-R models giving the highest correlation with Langmuir model. This confirmed that chitin consists of both monolayer and homogeneous adsorption sites. Based on the D-R model, the adsorption of AY25 dye onto chitin was via chemisorption.</p><p> Same batch experiments were performed using unprocessed chitin and chitin extracted from red lobster shells to determine the efficiency of adsorption with different adsorbents. Results showed that unprocessed chitin is not a good adsorbent material. Chitin extracted from red lobster shell is better than that of crab legs giving the higher adsorptive capacity. In conclusion, chitin from waste crab legs is a very suitable adsorbent material that is capable of removing up to 95% of the initial concentration of AY25 dye. Also chitin is inexpensive and eco-friendly adsorbent found abundantly in nature. </p>

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Piccin, Jeferson Steffanello. "Resíduo sólido da indústria coureira como adsorvente alternativo de corante." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/86462.

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Os resíduos sólidos da indústria coureira são produzidos em diferentes etapas de limpeza, classificação e ajuste da espessura do couro, e são classificados como perigosos quando gerados nas etapas posteriores ao curtimento com cromo. Os resíduos que já passaram pela etapa de curtimento apresentam elevada estabilidade, não sendo facilmente degradados. Além disso, nas etapas do acabamento molhado do couro, em especial no tingimento, corantes são utilizados para conferir cor aos artigos. Devido à necessidade de utilização de água e corantes em excesso, são gerados, nessas etapas, efluentes coloridos. Esses efluentes possuem quantidades elevadas de substâncias solúveis e coloridas que, devido ao seu potencial recalcitrante, não são facilmente removidas em sistemas convencionais de tratamento de efluentes. Neste trabalho, é apresentada uma nova proposta para o uso dos resíduos sólidos da indústria coureira antes de seu destino final, possibilitando assim uma sobrevida a esses resíduos como adsorventes alternativos de substâncias presentes em efluentes industriais do processamento do couro, em especial, os corantes oriundos das operações de acabamento molhado, com perspectivas ao reuso dos efluentes. Os efluentes oriundos da etapa de acabamento molhado de couro em escala piloto foram caracterizados. Assim, soluções aquosas sintéticas no intervalo de concentrações de corantes de efluentes foram preparadas e foi avaliada a capacidade de adsorção de dois tipos de resíduos de couro (curtido ao cromo e vegetal) em diferentes valores de pH. As isotermas de adsorção e cinética dos corantes Amarelo Ácido 194, Vermelho Ácido 357 e Preto Ácido 210 foram obtidos para os resíduos de couro curtido ao cromo no pH ideal de adsorção (entre 2 e 3). Além disso, a remoção do corante presente em efluente de tingimento (obtido em escala piloto) foi otimizada utilizando técnicas sequenciais de planejamento de experimentos. As isotermas apresentaram diferentes comportamentos, sendo do tipo C1, H2 e H3/L3 para os corantes Amarelo 194, Vermelho 357 e Preto 210, respectivamente. Os estudos dos mecanismos de transferência de massa demonstraram que a adsorção do corante Amarelo 194 é controlada pela transferência de massa na camada limite, enquanto que para os corantes Vermelho 357 e Preto 210 também foi observada a difusão no interior da partícula. Para esses dois últimos corantes, as difusividades foram da ordem de 10-9 e 10-11 m2 min-1. Os dados termodinâmicos, associados a análises instrumentais, confirmaram a natureza de adsorção por interações entre os grupos SO3 - e NO2 - dos corantes com os grupos NH(n) + do couro. Para a remoção do corante Vermelho 357 de efluentes de tingimento, uma região de ótimo foi observada para capacidade de adsorção no equilíbrio, correspondente ao pH 3,0 e temperatura entre 16 e 18 °C, sendo obsevado aproximadamente 74 mg g-1 para a concentração de 6,0 g L-1 de adsorvente. Entretanto, na região de estudo não foi observado região de ótimo para a remoção, sendo que para isso seria necessário um deslocamento no planejamento para pH inferiores a 3 e temperaturas superiores a 35 °C, o que de certa forma é inviável. Observouse que a máxima remoção em pH 3 e 35 °C foi de 75 %. O processo de remoção do corante por adsorção foi capaz ainda de reduzir a toxicidade do efluente em cerca de 90 %.<br>The solid wastes from the tannery industry are produced in different steps of cleaning, sorting and adjusting the thickness of the leather, and they are classified as hazardous waste when they are produced after chrome tanning. The tanned leather wastes present high stability and are not easily degraded. Moreover, in the wet leather finish, particularly during the dyeing process, dyes are used to color the items. Due to the need of using water and dye in excess, colored effluents are generated in these steps. These effluents have high amounts of soluble and colored substances that, due to their recalcitrant potential, are not easily treated in conventional eflluent treatment systems. In this research, a new proposal for the use of solid waste in the leather industry before its final destination is presented, which enables the reuse of these wastes as alternative adsorbents of substances in industrial effluents from the leather processing, particularly dyes derived from wet finishing operations, with the aim of reusing the wastewater. The effluents from the wet leather finish steps in a pilot scale were characterized. Thus, aqueous synthetic solutions in the concentration range of effluent dyes were prepared and the adsorption capacity of two types of leather waste (chrome tanned and vegetable leather) was evaluated at different pH values. Adsorption isotherms and kinetics of Acid Yellow 194, Acid Red 357 and Acid Black 210 dyes were obtained for chrome tanned leather waste in optimal adsorption pH (between 2 and 3). Furthermore, the removal of the dyes in deing wastewater (obtained in a pilot scale) was optimized by using sequential experimental design techniques. The isotherms presented different results: C1, H2 and H3/L3 types for the Yellow 194, Red 357 and Black 210 dyes, respectively. Studies on the mechanisms of mass transfer have shown that the adsorption of the Yellow 194 dye is controlled by mass transfer in the boundary layer, whereas in Red 357 and Black 210 dyes a diffusion was also observed inside the particle. For these last two dyes, diffusivities were 10-9 and 10-11 m2 min-1. The thermodynamic data, associated with instrumental analysis, confirmed the nature of adsorption by interactions between the NO2 - and SO3 - groups of the dyes with the NHn + groups of the leather. For removing the Red 357 dye in dyeing effluents, an optimum region was observed for the adsorption capacity in equilibrium, which corresponds to pH 3.0 to 3.2 and temperature between 16 and 18 °C, with about 74 mg g-1 for the concentration of 6.0 g L-1 adsorbent. However, in the study region an optimum region for the removal was not observed, and this would require a shift in planning for pH below 3 and temperatures above 35 °C, which is somewhat impractical. It was observed that the maximum removal at pH 3 and 35 °C was 75 %. The removing process the dye by adsorption was also able to reduce the toxicity of the effluent by about 90 %.

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Yalala, Bongani Ndhlovu. "Ion exchange resins an functional fibres :a comparative study for the treatment of brine waste water." Thesis, University of the Western Cape, 2009. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_8342_1298358875.

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<p>To improve the adsorption capacity of polyacrylonitrile (PAN) fibres, hydrophilic amidoxime fibres were prepared by subsequent conversion of the cyano groups to an amidoxime group by reacting with hydroxylamine at 80&deg<br>C at an optimum amidoximation time of 2 hrs. The amidoxime fibre was hydrolyzed/alkali treated in a solution of sodium hydroxide to enhance or improve the adsorption properties. This was followed by characterization of the amidoxime and hydrolyzed fibres using Scanning electron microscopy (SEM)<br>Fourier transform Infrared Spectroscopy (FTIR) and exchange capacity (cationic and anionic). SEM showed that the hydrolysis process made the surface of Amidoxime fibre rougher than that of Polyacrylonitrile fibre. FTIR revealed that the hydrolyzed Amidoxime fibres contained conjugated imine (-C=N-) sequences. Functionalization enhanced the sorption of amidoxime fibres by an increase of 20 % in the cationic exchange capacity. This was achieved by the part conversion of the cyano groups into the carboxylic acid groups. The fibres showed faster kinetics largely due the available exchange sites on the surface of the fibres hence the equilibration was achieved much quicker.</p>

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Mella, Bianca. "Resíduo sólido de depilação como adsorvente de corantes para tingimento de couro." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/172097.

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Nas etapas de processamento do couro, de limpeza da pele, de recortes e ajuste da espessura do couro, diferentes tipos de resíduos sólidos são gerados. Dentre esses resíduos, os pelos provenientes da etapa de depilação são descartados. Além disso, nas etapas finais do acabamento molhado do couro, em especial no tingimento, são adicionados corantes e outros produtos químicos com o objetivo de dar ao couro características superficiais, como cor e textura, gerando, consequentemente, efluentes de difícil tratamento devido ao potencial recalcitrante dos produtos químicos. O objetivo deste trabalho é apresentar uma alternativa ao uso do pelo proveniente da etapa de depilação, possibilitando assim uma extensão no ciclo de vida deste resíduo como um adsorvente alternativo para remoção de corantes empregados na indústria do couro. O pelo (CHW) foi caracterizado através de microscopia eletrônica de varredura (MEV), espectroscopia de raios X dispersiva de energia (EDS), espectroscopia de infravermelho (FTIR), bem como sua área superficial específica e distribuição de tamanho de poro por análises de BET/BJH. A capacidade de remoção dos corantes Azul Ácido 161 (AB-161) e Preto Ácido 210 (AB-210) em soluções aquosas foi estudada emfaixas de pH de 1,0 a 10,0 e também a dosagem ótima de adsorvente. Nas isotermas de adsorção,o modelo de Liu foi o que melhor apresentou resultados para os dois corantes estudados em todas as temperaturas analisadas (30, 40 e 50ºC) No estudo cinético, o modelo de ordem-geral apresentou o melhor ajuste dos dados, com menor tempo de contato para remoção do corante AB-161 de 600 min com o pelo (CHW) e 90 min com o carvão ativado comercial (CAC), nos valores de pH 3,0 e pH 4,0, respectivamente. Para o corante AB-210 o menor tempo de contato para atingir o equilíbrio foi de 120 min e 90 min para CHW e o CAC, nos valores ótimos de pH de 2,0 e 4,0, respectivamente. O carvão produzido (AC-CHW) a partir do pelo residual foi ativado com H3PO4, caracterizado e testado em efluentes reais para remoção dos corantes Laranja Ácido 142 (AO-142) e Marrom Ácido 414 (AB-414). O carvão produzido apresentou um elevado diâmetro de poro (140,70 A), o que favoreceu a adsorção de moléculas maiores e mais complexas, como as presentes nos efluentes reais. Através do MEV e do FTIR observou-se a presença dos compostos estudados no AC-CHW após aadsorção, onde os resultados indicaram que os grupos funcionais de -CH=CH- participaram ativamente do processo de remoção. O pHzero obtido do AC-CHWfoi de 3,65, o que favoreceu a remoção desses compostos já que o efluente real apresenta um pH inferior a 4,0. Os percentuais de remoção obtidos de área sob as curvas de adsorção indicam uma remoção de 51,94% e 49,73% dos efluentes contendo AB-414 e AO-142, respectivamente.<br>In the stages of leather processing, skin cleansing, trimming and leather thickness adjustment, different types of solid waste are generated. Among these residues, hairs from the depilation stage are discarded. In addition, in the final stages of the wet finishing of leather, in particular in dyeing, dyes and other chemical products are added with the aim of giving the leather surface characteristics, such as color and texture, thus generating effluents that are difficult to treat due to the potential recalcitrant of chemicals. The objective of this work is to present an alternative to the use of hair from the depilation stage, thus allowing an extension in the life cycle of this residue as an alternative adsorbent for the removal of dyes used in the leather industry. The hair (CHW) was characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), infrared spectroscopy (FTIR), as well as its specific surface area and pore size distribution by analysis of BET/BJH. The ability to remove Acid Blue 161 (AB-161) and Acid Black 210 (AB-210) dyes in aqueous solutions was studied in pH ranges from 1 to 10 and also the optimum dosage of adsorbent. In the adsorption isotherms, Liu model presented the best results for the two dyes studied at all temperatures (30, 40 and 50ºC). In the kinetic study, the general-order model presented the best fit of the data, with a lowest contact time to remove the AB-161 dye of 600 min with the hair (CHW) and 90 min with the commercial activated charcoal (CAC) at pH 3.0 and pH 4.0, respectively For the dye AB-210, the lowest contact time to reach equilibrium was 120 min and 90 min for CHW and CAC, at the optimum pH values of 2.0 and 4.0, respectively. The charcoal produced (AC-CHW) from the residual was activated with H3PO4, characterized and tested in actual effluents to remove the Acid Orange 142 (AO-142) and Acid Brown 414 (AB-414) dyes. The carbon produced had a high pore diameter (140,70 A), which favored the adsorption of larger and more complex molecules, such as those present in the actual effluents. The presence of the compounds studied in the AC-CHW after adsorption was observed through the SEM and the FTIR, where the results indicated that the functional groups of -CH = CH- actively participated in the removal process. The obtained pHzero of AC-CHW was 3.65, which favored the removal of these compounds since the actual effluent had a pH lower than 4.0. The percentages of removal obtained from area under the adsorption curves indicate a 51.94% and 49.73% removal of the effluents containing AB-414 and AO-142, respectively.

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Vaghetti, Júlio César Pacheco. "Utilização de biossorventes para remediação de efluentes aquosos contaminados com íons metálicos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17482.

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Esta tese apresenta a aplicação de biossorventes alternativos obtidos a partir da casca da noz pecã (Carya illinoensis) e da casca do pinhão (Araucaria angustifólia) na remoção de íons metálicos tóxicos presentes em soluções aquosas. O biossorvente de casca de nozes foi aplicado com sucesso na remoção dos íons metálicos: Cu(II), Mn(II), Pb(II), Cr(III), Fe(III) e Zn(II), enquanto que o biossorvente obtido a partir da casca de pinhão apresentou, também, excelente capacidade de adsorção de íons de Cr(VI) em soluções contaminadas pelo mesmo. Os biossorventes casca de nozes PNS (do inglês: pecan nutshell) e casca de pinhão PW (do inglês: Piñon Waste) foram caracterizados química e fisicamente através de: isotermas de adsorção e dessorção de N2, espectroscopia no infravermelho com transformada de Fourier, microscopia de varredura eletrônica, análise elementar, determinação da composição mineral e quantificação de grupos funcionais. A capacidade de adsorção desses biossorventes foi investigada utilizando procedimentos de biossorção em batelada. Os efeitos causados pela modificação de parâmetros experimentais como pH, dosagem de biossorvente e concentração inicial dos íons nos sistemas de adsorção também foram pesquisados. Testou-se a adequação de cinco modelos de cinética de adsorção aos dados experimentais obtidos com o biossorvente PNS, constatou-se que os modelos de ordem-fracionária e o de difusão intrapartícula apresentaram os melhores resultados. Já para adsorções de Cr(VI) em PW o melhor modelo cinético foi o de quimiossorção de Elovich, apresentando taxas de biossorção de 284,9, 396,9 e 461,5 mg g-¹ h-¹ para os níveis de concentração inicial de Cr(VI) de 500,0, 700,0 e 1000,0 mg l-¹ respectivamente. O estudo do equilíbrio de adsorção envolveu a aplicação dos modelos de isotermas de: Langmuir, Freundlich, Redlich-Peterson e Sips aos dados experimentais no intuito de verificar o modelo mais apropriado para descrever os sistemas de adsorção quando em equilíbrio. Avaliou-se, utilizando a função estatística de erro, que o modelo de Sips foi o que mais se adequou aos dados experimentais obtidos nos diversos sistemas pesquisados (biossorvente - ion metálico). A capacidade máxima de adsorção para íons de Cr(III), Fe(III), Zn(II), Cu(II), Mn(II) e Pb(II) em PNS foi de 93,0, 76,6, 108,0, 85,9, 98,0 e 195,9 mg g-¹, respectivamente, enquanto que a de Cr(VI) em PW foi de 240,0 mg g-¹.<br>This thesis reports the possibility of applying the alternative biosorbent pecan nutshell (PNS- Carya illinoensis) used to remove the followed metallic ions: Cu(II), Mn(II), Pb(II), Cr(III), Fe(III), Zn(II) from aqueous solutions. This thesis also shows the application of Brazilian-pine fruit coat, named piñon wastes (PW; Araucaria angustifolia) as biosorbent to remove Cr(VI) from aqueous solutions. The PNS and PW biosorbents were characterized by N2 adsorption-desorption isotherms, FTIR spectroscopy, scanning electron microscopy, elemental analysis, mineral composition determination, and functional groups detection. The biosorbents ability to remove the metallic ions was investigated by using batch biosorption procedure. The effects of changing experimental parameters such as, pH, biosorbent dosage and initial ion concentration on the biosorbents adsorption capacities were studied. Five kinetic models were tested, being the adsorption kinetics better fitted to fractionary-order kinetic model. Besides that, the kinetic data were also fitted to intra-particle diffusion model, presenting three linear regions, indicating that the kinetics of adsorption should follow multiple sorption rates. The equilibrium data were fitted to Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. Taking into account a statistical error function, most of PNS biosorption equilibrium data were best fitted to Sips isotherm model. The maximum biosorption capacity of PNS were 93.0, 76.6, 108.0, 85.9, 98.0 and 195.9 mg g-¹ for Cr(III), Fe(III), Zn(II), Cu(II), Mn(II) and Pb(II), respectively. The adsorption kinetics followed the Elovich chemisorption kinetic model, obtaining the following the initial adsorption rate, 284.9, 396.9 and 461.5 mg g-¹ h-¹ using a 500.0, 700.0 and 1000.0 mg L-¹ initial concentration of Cr(VI), respectively. The maximum adsorption capacity of PW was 240.0 mg g-¹ for Cr(VI), using Sips isotherm model. This high adsorption capacity of PW places this biosorbent as one of the best adsorbents for removal of Cr(VI) from aqueous effluents.

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Siddiqui, Naved Ahmed. "DEVELOPMENT OF BAMBOO DERIVED SORBENTS FOR GAS PHASE ADSORPTION OF ELEMENTAL MERCURY." Available to subscribers only, 2009. http://proquest.umi.com/pqdweb?did=1879983301&sid=4&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Books on the topic "Adsorption kinetics and isotherms"

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Liu, Yu. Fundamentals and applications of biosorption isotherms, kinetics and thermodynamics. Nova Science Publishers, 2009.

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

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K, Kokula Krishna Hari, and K. Saravanan, eds. Balance, Kinetics, Isotherm and Thermodynamic Modeling of Adsorption of Reactive Yellow 107on to Balsamodendroncaudatum Wood Squander Activated Carbon Material. Association of Scientists, Developers and Faculties, 2016.

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1944-, Gortel Z. W., ed. Physisorption kinetics. Springer-Verlag, 1986.

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Yiacoumi, Sotira, and Chi Tien. Kinetics of Metal Ion Adsorption from Aqueous Solutions. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2319-2.

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Bernard, Aarden Frans, Aarden Frans Bernard, and Aarden Frans Bernard. Adsorption onto heterogeneous porous materials: Equilibria and kinetics. Technische Universiteit, 2001.

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Kouyoumdjiev, Marcho Stefanov. Kinetics of adsorption from liquid phase on activated carbon. [s.n.], 1992.

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Masel, Richard I. Principles of adsorption and reaction on solid surfaces. Wiley, 1996.

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Yiacoumi, Sotira. Kinetics of metal ion adsorption from aqueous solutions: Models, algorithms, and applications. Kluwer Academic Publishers, 1995.

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United States. National Aeronautics and Space Administration., ed. An investigation of the effect of surface impurities on the adsorption kinetics of hydrogen chemisorbed onto iron. National Aeronautics and Space Administration, 1991.

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Book chapters on the topic "Adsorption kinetics and isotherms"

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Latif, Shoomaila, Muhammad Imran, M. Hassan Siddique, Muhammad Ehsan, and Shahid Ahmad. "Adsorption Kinetics and Isotherms." In Biosorbents. CRC Press, 2024. http://dx.doi.org/10.1201/9781003366058-7.

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Kanagalakshmi, M., S. Gopika Devi, P. Ananthi, and Anitha Pius. "Adsorption Isotherms and Kinetic Models." In Carbon Nanostructures. Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-48719-4_8.

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Ray, Suprakas Sinha, Jonathan Tersur Orasugh, Lesego Tabea Temane, and Sarah Constance Motshekga. "Adsorption and Its Kinetics, Isotherms, as Well as Thermodynamics." In Graphene-Based Materials as Adsorbents for Wastewater Decontamination. CRC Press, 2024. http://dx.doi.org/10.1201/9781032621302-4.

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Ziane, Samira, and Amine Khelifa. "Kinetics and Isotherms Adsorption of Reactive Dye by Thermally Treated Dolomite." In Proceedings of the Third International Symposium on Materials and Sustainable Development. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89707-3_61.

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Hendaoui, Kamel, Fadhila Ayari, and Malika Trabelsi-Ayadi. "Modeling of Adsorption Isotherms and Kinetics of Organic Pollutants onto Three Tunisian Clays." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (3rd Edition). Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-43922-3_25.

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Bir, Tanmoy, Sumit Baran Chowdhury, and Dulal Ch Mukherjee. "A Study on Adsorption Kinetics and Isotherms of Heavy Metals on Sawdust and Optimization." In Springer Proceedings in Earth and Environmental Sciences. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-64006-3_12.

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Rajiman, Viga, Hairul Nazirah Abdul Halim, and Lian See Tan. "Nitrate Adsorption Using Spent Coffee Ground: Kinetics, Isotherm, and Thermodynamic Studies." In Green Energy and Technology. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1695-5_16.

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Lowell, S., and Joan E. Shields. "Adsorption isotherms." In Powder Surface Area and Porosity. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7955-1_3.

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Mollerup, Jørgen M. "Adsorption Isotherms." In Preparative Chromatography for Separation of Proteins. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119031116.ch2.

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Lowell, S., Joan E. Shields, Martin A. Thomas, and Matthias Thommes. "Adsorption Isotherms." In Characterization of Porous Solids and Powders: Surface Area, Pore Size and Density. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2303-3_3.

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Conference papers on the topic "Adsorption kinetics and isotherms"

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Dominguez Olivo, J. M., B. Brown, and S. Nesic. "Modeling of Corrosion Mechanisms in the Presence of Quaternary Ammonium Chloride and Imidazoline Corrosion Inhibitors." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07406.

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Abstract The mitigation of corrosion in carbon steel pipelines due to the addition of corrosion inhibitors has traditionally been described by using adsorption isotherms. Consequently, current models of corrosion mitigation by inhibitors are based on the use of adsorption isotherms to predict surface coverage, inhibitor efficiency and ultimately the corrosion rate as a function of inhibitor concentration. However, a coverage does not properly describe the underlying electrochemical mechanisms, nor can it predict the resulting change in corrosion potential. The goal of this research is to analyze and explain how the underlying electrochemical reactions are affected by the presence of adsorbed corrosion inhibitor and the shift in corrosion potential that occurs. Two CO2 corrosion inhibitors are studied here: tail oil fatty acid / diehylenetriamine imidazoline and quaternary alkyl benzyl dimethyl ammonium chloride. A mechanistic model was developed based on electrochemical kinetics and by using a mitigation factor, θ, which accounts for the overall retardation in the anodic and cathodic reactions. It was found that the retardation of the electrochemical reactions affected by these inhibitor can be modeled by using a single parameter: surface coverage factor.

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Kim, Jinsu, Shubham Jamdade, Yanhui Yuan, and Matthew J. Realff. "Adsorption-based Atmospheric Water Extraction Process: Kinetic Analysis and Stochastic Optimization." In Foundations of Computer-Aided Process Design. PSE Press, 2024. http://dx.doi.org/10.69997/sct.180182.

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Adsorption-based Atmospheric Water Extraction (AWE) is an energy-efficient distributed freshwater supply method. This research focuses on AWE's kinetic analysis and stochastic optimization, investigating the impact of ambient conditions, kinetics, and weather variability. A one-dimensional fixed-bed system was numerically analyzed using the validated isotherm of MIL-100 (Fe), assuming different kinetic parameters within the linear driving force model. Stochastic optimization, based on annual weather data from Georgia (GA), illustrates the influence of weather conditions on AWE process performance, operation, and cost. Our study offers valuable insights for future research, including site selection, adsorbent material development, and process design. We outline three critical areas for further exploration: experimental verification, material screening, and meteorological site selection.

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Cundari, Lia, Saputri Agus Renelda, Nur Hayyu Tagar Molek, Shifa Putri Amaliah, and Feby Azzahra. "Removal of Chromium (VI) from Aqueous Solution Using Bentonite: The Effect of Adsorbent Dose on Characteristic, Isotherm and Kinetic Study." In Sriwijaya International Conference on Engineering and Technology 2023. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-v6q7ym.

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One kind of heavy metal that comes from industrial waste is Cr (VI), which is obtained from steel, textile, tanning, photography, dyes, explosives, matches, and fuel mobilization waste. Cr (VI) is a carcinogen and extremely hazardous to both people and animals. In Indonesia, bentonite is a raw material that is abundantly available. This study aims to investigate the effects of varying adsorbent doses on the properties, % removal, isotherms, and kinetics of adsorption of Cr (VI) from aqueous solution. Adsorbent doses ranged from 10 g/L to 30 g/L for 0–80-minute contact periods. morphological analysis of bentonite using a scanning electron microscope (SEM). Features of bentonite were tiny lumps of varying sizes and the absence of pores. 96.5% is the optimal elimination of Cr (VI). The morphological analysis of bentonite using a scanning electron microscope (SEM). Features of bentonite were tiny lumps of varying sizes and the absence of pores. When using a dose of 20 g/L and a 60-minute duration, the maximum elimination of Cr (VI) is 96.5%. Isotherms follow Langmuir and kinetics fit to first order. These findings demonstrate that bentonite is a valuable material for future development and is effective at removing Cr (VI) from aqueous solutions.

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Oreofe, Toyin A., Adejumoke A. Inyinbor, Olugbenga S. Bello, and Oladipupo O. Ogunleye. "Adsorption Isotherm, Kinetics and Thermodynamics studies on Chloroquine sequestration using coconut shell activated carbon." In 2024 International Conference on Science, Engineering and Business for Driving Sustainable Development Goals (SEB4SDG). IEEE, 2024. http://dx.doi.org/10.1109/seb4sdg60871.2024.10629925.

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Sabadash, Vira, Oleh Konovalov, Anna Nowik-Zajac, and Iwona Zawierucha. "Adsorption Properties of Natural and Synthetic Zeolites for Ammonium and Phosphate Removal from Wastewater." In 8th International Congress "Environment Protection. Energy Saving. Sustainable Environmental Management". Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-p0hfsd.

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Water resources are crucial in any region's overall natural resource complex. This research focuses on addressing these pollution issues through water treatment processes. The primary objective of this study was to examine the adsorption of phosphates using both natural and synthetic adsorbents, particularly aluminosilicates. Under static and dynamic conditions, the research assessed the sorption characteristics of natural zeolite, specifically clinoptilolite obtained from the Sokyrnytsia mineral deposits. Results indicated that the adsorption of phosphates is more effective in acidic environments. It was observed that clinoptilolite exhibits a higher adsorption capacity for unsubstituted phosphates, which diminishes when alkali metal ions replace orthophosphoric acid. Additionally, the study highlighted the significant influence of pH levels on the sorption properties of clinoptilolite, especially about P₂O₅. The kinetic coefficients of the adsorption process were determined using experimental data and theoretical frameworks. Furthermore, mathematical modelling was employed to describe the adsorption dynamics of the active components by granular sorbents, effectively capturing the transient nature of diffusive-kinetic processes in complex, multicomponent systems. This research deepens our understanding of phosphate adsorption mechanisms. It provides valuable insights into optimising water treatment strategies using natural adsorbents, which could play a critical role in mitigating the effects of water pollution in the region. Zeolites derived from fly ash produced by the Dobrotvir thermal power plant have been synthesised and modified to enhance their properties. This study focuses on the characteristics of these zeolites, with a particular emphasis on thermogravimetric analysis, to understand their stability and performance under varying conditions. The adsorption capabilities of the natural zeolite were tested against common pollutants found in wastewater from meat-processing plants, specifically targeting ammonium and phosphate contaminants. Experimental data allowed for determining equilibrium adsorption capacities and corresponding isotherms were constructed at a standard temperature of 20°C. The results indicate that zeolite adsorbs phosphates more effectively than ammonia nitrogen. Further analysis revealed that clinoptilolite's adsorption capacity is higher when interacting with single-component systems but decreases when it simultaneously adsorbs two different substances from the solution. This decrease suggests competitive adsorption dynamics when multiple contaminants are present. Given the finite availability of natural zeolite resources, this research highlights the importance of synthesising synthetic zeolites as a sustainable alternative.

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Domínguez Olivo, J. M., B. Brown, D. Young, and S. Nesic. "Electrochemical Model of CO2 Corrosion in the Presence of Quaternary Ammonium Corrosion Inhibitor Model Compounds." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-13392.

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Abstract The oil and gas industry utilizes surfactant-type organic corrosion inhibitors to mitigate internal pipeline corrosion. Changes in corrosion rates due to inhibitor addition have been related to adsorption isotherms as a function of the inhibitor concentration. However, the question as to how a corrosion inhibitor affects the electrochemical reactions governing CO2 corrosion remains unclear. This research proposed to investigate the issue by using a systematic approach: four different corrosion inhibitor model compounds, synthesized in-house, were utilized to determine the effect of the tail length on the kinetics of the electrochemical process underlying the corrosion of a UNS K03014 steel in CO2 corrosion at pH 4. The corrosion inhibitors all contained the same head group (dimethyl-benzyl-ammonium) with four different alkyl tail lengths (C4, C8, C12, and C16). A theoretical model of the increase in the activation energy of the electrochemical process underlying CO2 corrosion due to the presence of the corrosion inhibitors led to the development of a modified Butler-Volmer equation. Such an equation describes the retardation in charge transfer rates of the electrochemical reactions associated with the corrosion of mild steel. The model was compared with experimental potentiodynamic sweeps for each system containing the corrosion inhibitor model compounds. As a result, the corrosion model predicts the corrosion rate and the open circuit potential in the presence of a corrosion inhibitor with a high degree of accuracy.

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Kwarteng, Felix A., Mohsen A. Hassan, Hidenori Ohashi, and Ahmed S. G. Khalil. "Textile Wastewater Treatment Using Activated Graphene-Like Biochar Derived from Onion Peel Biomass." In 2024 8th International Conference on Materials Engineering and Nano Sciences & 2024 8th International Conference on Material Engineering and Manufacturing. Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-lxmzt1.

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Allium cepa L., popularly known as onion, has many benefits aside from being used as a vegetable. This study explored onion peel biomass by converting it to biochar (BC) followed by activation with KOH under optimal temperature and mix ratio. Various characterizations such as Raman, SEM, XRD and BET were performed to examine the surface and morphological properties of the activated biochar. The developed BC was utilized to treat textile wastewater composing methyl orange (MO) dye. The KOH-activated onion peel biochar showed a surface area of 1725.6 m2/g, resulting in a maximum dye adsorption capacity of 454.54 mg/g. Raman spectroscopy further revealed the existence of graphene-like structures of the biochar. The adsorption kinetics show that BC follows the pseudo-second-order model with an R2 of 0.9988. The isotherm experiments also conformed to the Langmuir model with an R2 of 0.9958. The influence of pH was studied, and results showed higher removal efficiencies at a pH of 2. Finally, the regeneration and recyclability of the prepared adsorbent was run for three successive cycles, after which it maintained appreciable adsorption capacity and removal efficiencies. Overall, the BC derived from onion peel demonstrated that it could be a promising alternative and high-performance adsorbent for treating textile wastewater.

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Tkachenko, Anastasiia, Olha Sahdeeva, Galina Krusir, and Myroslav Malovanyy. "Study of Sorption Properties of Buckwheat Husk Biochar." In 8th International Congress "Environment Protection. Energy Saving. Sustainable Environmental Management". Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-8ufftt.

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Buckwheat grain processing produces a significant amount of buckwheat hulls, which are usually stored or incinerated, posing a threat to the environment, particularly to soil and air. The solution to this problem may lie in the production of biochar from buckwheat husks. Buckwheat husks have a favourable composition for biochar production. The resulting biochar can be used as an additive to compost to improve its characteristics, ensure a high-quality composting process and adsorb pollutants. Since the mechanisms of sorption of biochar produced from buckwheat husk are not yet well understood, the aim of this study is to investigate the sorption properties of biochar on the example of lead ion sorption. Comparison of the efficiency of lead ion sorption by different modified forms of raw materials shows that the method of biochar production significantly affects its sorption activity. An increase in the pyrolysis temperature has a positive effect on the sorption properties; the highest sorption is achieved at an initial concentration of lead ions of 1.00 mg/ml. The analysis of adsorption isotherms indicates a type L, which indicates minimal interaction between the adsorbed molecules. The kinetic parameters of the sorption process show that the system reaches equilibrium within a few hours, and the maximum sorption values are observed after 2.5-3 hours of incubation.

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Santana, Vinicius, Andr�s Riedemann, Pierre J. Walker, and Idelfonso Nogueira. "Langmuir.jl: An Efficient and composable Julia Package for Adsorption Thermodynamics." In The 35th European Symposium on Computer Aided Process Engineering. PSE Press, 2025. https://doi.org/10.69997/sct.144752.

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Recent advancements in material design have made adsorption a more energy-efficient alternative to traditional thermally driven separation processes. Accurate modelling of adsorption thermodynamics is crucial for designing and operating equilibrium-limited adsorption systems. High-quality open-source packages like PyIAST, PyGAPsare available for processing adsorption data in Python. They provide a robust set of features for processing and analysing isotherms. However, they have no support for automatic differentiation and are not targeted for performance. Langmuir.jl addresses these limitations by leveraging Julia's composable and differentiable programming ecosystem. Langmuir.jl includes tools for processing adsorption thermodynamics data�loading data, fitting isotherms with most often used models, predictive multicomponent adsorption through Ideal Adsorption Solution Theory (IAST) � and, importantly, enabling accurate derivative calculations through Julia's automatic differentiation libraries, without requiring extensive code adjustments. Furthermore, Langmuir.jl achieves two orders of magnitude faster IAST calculations compared to its Python counterpart, PyIAST.

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Desai, P. S., and S. M. Kapopara. "Inhibitory Action of Xylenol Orange on Aluminum Corrosion in Hydrochloric Acid Solution." In CORROSION 2012. NACE International, 2012. https://doi.org/10.5006/c2012-01101.

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Abstract The purpose of this paper is to study the inhibition effect of xylenol orange on the corrosion of aluminum (2S Grade) in 0.4 -0.6 M HCl over the temperature range of 40-60°C. It also attempts to correlate both thermodynamic parameters and kinetic parameters with the inhibition effect. The inhibition efficiencies of xylenol orange are investigated by weight loss and potentiodynamic polarization methods. The corrosion rate of aluminum decreases with increasing inhibitor concentrations and the efficiency of inhibition increases with increasing concentration of inhibitor up to almost 87% in 0.4M HCl and up to 84% in 0.6M HCl. The concentrations of inhibitor were in the range of 2 mM to 8mM. Xylenol orange acts as a good inhibitor and inhibition efficiency increases with the inhibitor concentration, while it decreases with HCl concentration and temperature. The adsorption of inhibitor on the aluminum surface obeys the Langmuir adsorption isotherm equation. The inhibition effect is satisfactorily explained by both thermodynamic and kinetic parameters. The experimental data have been treated with adsorption theory and kinetic equations successfully. Polarization curves show that xylenol orange is a mixed-type inhibitor in hydrochloric acid.

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Reports on the topic "Adsorption kinetics and isotherms"

1

DUFFEY, CHERYL. Determination of Cesium (CS+) Adsorption Kinetics and Equilibrium Isotherms from Hanford Waste Simulants Using Resorcinol-Formaldehyde (RF) Resins. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/828771.

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Blum, L., and D. A. Huckaby. Phase Transitions at Liquid Solid Interfaces: Pade Approximant for Adsorption Isotherms and Voltammograms. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada232623.

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Hobbs, D. T. Preliminary Report on Monosodium Titanate Adsorption Kinetics. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/4880.

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Garn, Troy G., Mitchell Greenhalgh, Veronica J. Rutledge, and Jack D. Law. Adsorption Isotherms for Xenon and Krypton using INL HZ-PAN and AgZ-PAN Sorbents. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1170318.

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Hobbs, D. T. Phase IV Simulant Testing of Monosodium Titanate Adsorption Kinetics. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/963951.

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Hobbs, D. T. Phase V Simulant Testing of Monosodium Titanate Adsorption Kinetics. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/761645.

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Katz, Lynn Ellen. Adsorption Equilibrium and Kinetics at Goethite-Water and Related Interfaces. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1352819.

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Hobbs, D. T. Final Report on Phase III Testing of Monosodium Titanate Adsorption Kinetics. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/12507.

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Rundberg, R. S. Assessment report on the kinetics of radionuclide adsorption on Yucca Mountain tuff. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/60337.

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Larson, Steven L., John H. Ballard, Fande Meng, et al. Kinetics and Thermodynamics of Uranium (VI) Adsorption onto Humic Acid Derived from Leonardite. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/37381.

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