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Journal articles on the topic 'Equilibrium Isotherm'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Vitázek, I., and J. Havelka. "Sorption isotherms of agricultural products." Research in Agricultural Engineering 60, Special Issue (2014): S52—S56. http://dx.doi.org/10.17221/35/2013-rae.

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The aim of the paper is to expand the theory of sorption and equilibrium moisture contents as well as to present the methodology of developing two types of sorption isotherms &ndash; I and II. The attention is also paid to the importance of the isotherms in the thermodynamics of drying and in the process of storage of agricultural products. Presented methodology of obtaining the isotherms is based on selected equations of the theory of adsorption and on the results of experimental measurements of equilibrium moisture content. Definition of the new isotherm II is introduced as dependence of

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2

Kelechi, E. Onwuka, S. Eze Kalu, U. Aghalibe Christopher, J.C. Igwe, and I.I. Ezeaku. "Adsorption of Malachite Green Dye on to Rectorite: Equilibrium and Thermodynamic Studies." 2349-7092 6, no. 3 (2019): 116–24. https://doi.org/10.5281/zenodo.13940220.

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The effect of temperature on the equilibrium adsorption of Malachite green dye from aqueous solution using rectorite was studied. The equilibrium adsorption data were analyzed using three widely applied isotherms; Langmuir, Freundlich, and Redlich-Peterson isotherm. A nonlinear method was used for comparing the best fitting of the isotherms. Best fits were found to be Redlich-Peterson isotherm. Thermodynamic parameters, such as ΔG°, ΔH°, and ΔS°, were calculated using adsorption equilibrium constant obtained from the Langmuir isotherm. Results suggested that the M

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3

Pode, Rodica, Eveline Popovici, Laura Cocheci, Erika Reisz, Mihaela Seftel, and Vasile Pode. "Sorption of phosphates and thiocyanates on isomorphic substituted Mg/Zn-Al-type hydrotalcites." Journal of the Serbian Chemical Society 73, no. 8-9 (2008): 835–43. http://dx.doi.org/10.2298/jsc0809835p.

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The sorption equilibriums of phosphate and thiocyanate anions on isomorphic substituted Mg/Zn-Al-type hydrotalcites were investigated in this study. Langmuir and Freundlich isotherms were used to interpret the equilibrium data for phosphate. The sorption equilibriums of phosphate on Mg3Al, Mg2ZnAl and Mg1.5Zn1.5Al hydrotalcites were well described by the Langmuir isotherm. The highest maximum sorption capacities for these adsorbents were as follows: 111, 101 and 95 mg g-1. The equilibrium constant and standard Gibbs energy changes were also calculated from the sorption data. Standard Gibbs ene

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4

Nathan, Risha Jasmine, Arvind Kumar Jain, and Rhonda J. Rosengren. "Non-Equilibrium Multi-Ion Biosorption Isotherms for Removal of Heavy Metals from Drinking Water." Indian Journal of Forensic Medicine and Pathology 14, no. 2 (Special issue) (2021): 246–55. http://dx.doi.org/10.21088/ijfmp.0974.3383.14221.34.

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Biosorption isotherms define the relationship between biosorption capacity of the biosorbent and the equilibrium concentration of the ions in solution, at a constant temperature. Experiments are routinely performed under near-equilibrium because it is impossible to determine the exact time at which equilibrium was attained. A novel attempt to study multi-ion biosorption in non-equilibrium conditions has been made, based on the Probability Isotherm theory. Materials and Methods: Probability Isotherm theory was examined with cucumber and kiwifruit peel beads which are reported to be efficient bi

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5

El-Aswad, Ahmed F., Mohamed R. Fouad, Mohamed E. I. Badawy, and Maher I. Aly. "Modeling study of adsorption isotherms of chlorantraniliprole and dinotefuran on soil." Current Chemistry Letters 13, no. 3 (2024): 503–14. http://dx.doi.org/10.5267/j.ccl.2024.2.008.

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Knowledge of pesticide adsorption characteristics is essential to predict their behavior in soil. The adsorption equilibrium isotherms of two insecticides chlorantraniliprole (CAP) and dinotefuran (DNF) on two common Egyptian soil types, clay loam and sandy loam were studied and modeled. To predict the adsorption isotherms and to determine the adsorption parameters, ten isotherm models: Langmuir (five linear forms), Freundlich, Temkin, Dubinin-Radushkevich, Elovick, Fowler-Guggenheim, Kiselev, Jovanoic, Harkins-Jura, and Halsey were applied on experimental data. The results revealed that the a

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Alcides, M. M. Michellod, N. Pila Andrea, I. Profeta Mariela, et al. "Models Sorption of Cyhalofop-Butyl, on Mesopotamic Agricultural Soils." Chemistry Research Journal 5, no. 4 (2020): 54–61. https://doi.org/10.5281/zenodo.12595863.

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<strong>Abstract </strong>The adsorption equilibrium of butyl (2R)-2-[4-(4-cyano-2-fluorophenoxy) phenoxy]propanoate (CB) was studied in rice-growing soil. The equilibrium sorption data were fitted into Langmuir, Temkin and Dubinin–Radushkevich (DRK) isotherms. Of the four adsorption isotherm, the R<sup>2</sup> value of Dubinin–Radushkevich isotherm model was the highest. The maximum monolayer coverage (q<sub>m</sub>) from Langmuir isotherm model was determined to be 0.079 mg g<sup>-1</sup>, the separation factor indicating a favorable sorption experiment is 0.38. The heat of sorpt

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7

Agarwal, Ajay K., Mahendra S. Kadu, Chandrashekhar P. Pandhurnekar, and Ishwardas L. Muthreja. "Equilibrium isotherm studies for the sorption of Nickel ions onto coal fly ash." Environment Conservation Journal 15, no. 1&2 (2014): 153–59. http://dx.doi.org/10.36953/ecj.2014.151220.

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The objective of the present study was to study equilibrium isotherm for the sorption of Nickel ions onto coal fly ash. In this study, BET adsorption isotherm was found to be best fitted among Langmuir, Freundlich, BET, Temkin and Harkins Jura adsorption isotherms using lest square fit method. The best fit adsorption isotherm is assessed by the linear coefficient of determination (R2) and non-linear Chi-square test. The theoretical value of qe calculated from the best fit linear equation of each adsorption isotherm and the experimental values of qe (0.08) are plotted against Ce, to compare the

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8

Tewari, Hemlata, and Vivekanand. "Removal of heavy metals from industrial effluent using Pinus roxburghii leaves as biosorbent: equilibrium modelling." Water Science and Technology 67, no. 9 (2013): 1894–900. http://dx.doi.org/10.2166/wst.2013.034.

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In the present study, biosorption capability of pine (Pinus roxburghii) leaves for the removal Cr6+, Cu2+, Fe2+ and Zn2+ ions, present in brass and electroplating industry effluent, were investigated with respect to different adsorbent doses, contact time and pH. Heavy metals concentrations were estimated by atomic absorption spectrophotometry. Initial concentration of Cr6+, Cu2+, Fe2+ and Zn2+ ions in the effluent were found to be 2.741, 4.551, 8.820 and 5.529 mg/L respectively. Biosorption studies revealed that Cr6+, Cu2+, Fe2+ and Zn2+ showed maximum removal of 99.85, 94.54, 97.10 and 89% a

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9

Brdar, Mirjana, Aleksandar Takaci, Marina Sciban, and Dusan Rakic. "Isotherms for the adsorption of Cu(II) onto lignin: Comparison of linear and non-linear methods." Chemical Industry 66, no. 4 (2012): 497–503. http://dx.doi.org/10.2298/hemind111114003b.

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Equilibrium studies were carried out for the adsorption of Cu(II) onto Kraft lignin as an adsorbent. The experimental data were fitted to the Freundlich, Langmuir and Redlich-Peterson isotherms by linear and non-linear method. Comparison of linear and non-linear regression method was given in selecting the optimum isotherm for the experimental data. The coefficient of correlation r2 and Chi-square test ?2 was used to select the best linear theoretical isotherm. The best linear model is Redlich-Peterson isotherm model, where r2=0,985 and ?2=0,02. In order to predict the error ERRSQ, HYBRD, MPSD

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10

Owabor, C. N., I. O. Oboh, and F. A. Omiojieahior. "Adsorption Isotherms for Naphthalene on Clay and Silt Soil Fractions: A Comparison of Linear and Nonlinear Methods." Advanced Materials Research 367 (October 2011): 359–64. http://dx.doi.org/10.4028/www.scientific.net/amr.367.359.

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Polycyclic aromatic hydrocarbons occur naturally in petroleum oil and coal and the burning of fuel and the activities of paper mills also release these compounds to the environment. Batch experimental adsorption study for both soil fractions was conducted in a soil slurry system at ambient temperature, using <0.02mm particle sizes. Comparison was made of the linear least-squares method and a trial-and-error nonlinear method of some widely used isotherm models for the adsorption of naphthalene on clay and silt fractions. The experimental results were fitted to the Langmuir, Freundlich, Radke

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AMOKO, Justinah, Babatunde OJO, Ayotunde BABATOLU, Abidemi DEMEHIN, and Isaiah Oke. "Linear and Non-Linear of 2-Parameters Adsorption Equilibrium Isotherm Models of Synthetic Arsenic Wastewaters." Fundamental and Applied Agriculture 8, no. 4 (2023): 684. http://dx.doi.org/10.5455/faa.143385.

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Contamination of groundwater and surface water with arsenic (Asic) has become emerging health and environmental problem around the world. This problem has received significant attention amongst scientists for the development of new adsorbents to remediate Asic -contaminated water. The ability of the immobilized powdered eggshell (Poes), as adsorbent, to remove Asic was studied under batch conditions. Equilibrium data were analysed using non-linear and linearized two-parameter adsorption isotherms models (Langmuir, Freundlich, Elovich, Flory–Huggins, Temkin, Frenkel- Hasley- Hill; Langmuir- Vag

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12

Önen, V., and E. Yel. "Adsorption of ferrocyanide onto raw and acid-activated clinoptilolite and sepiolite: equilibrium modelling by error minimization." Clay Minerals 48, no. 4 (2013): 613–26. http://dx.doi.org/10.1180/claymin.2013.048.4.15.

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AbstractThe experimental data on adsorption of Fe and CN of a ferrocyanide complex onto raw and acid-activated clinoptilolite/sepiolite on the basis of detention time and particle size was modelled by a linear and a non-linear approach. The linearized best-fit isotherm selection method and non-linear error minimization was applied through Freundlich, Langmuir and Temkin isotherms. ERRSQ, MPSD, HYBRID and ARE error functions were minimized by a developed MATLAB script to determine the isotherm parameters in non-linear optimization. The complex was not adsorbed as whole anions but the Fe and CN

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13

Ali Fil, Baybars. "Investigation of adsorption of Basic Orange 2 dye on montmorillonite and error analysis." Bulletin of the Chemical Society of Ethiopia 37, no. 1 (2022): 47–58. http://dx.doi.org/10.4314/bcse.v37i1.5.

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ABSTRACT. In this study, isotherm studies were investigated for the removal of basic orange 2 (BO2) dye on the montmorillonite surface. Two-parameter isotherm models such as Langmir, Freundlich, and Temkin isotherms and Three-parameter isotherm models such as Sips, Toth, and Khan isotherms were calculated by non-linear analysis method. The adsorption capacity at equilibrium was calculated by adding 0.035 g of adsorbent at 10-300 mg/L concentrations to 100 mL of synthetic dyestuff solution at room temperature. According to the results obtained, it was determined that the isotherm data matched t

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14

Luampon, Ratinun, and Suparerk Charmongkolpradit. "Temperature and relative humidity effect on equilibrium moisture content of cassava pulp." Research in Agricultural Engineering 65, No. 1 (2019): 13–19. http://dx.doi.org/10.17221/112/2017-rae.

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The purpose of this research was to study the effect of temperature and relative humidity on the equilibrium moisture content of cassava pulp. In experiments, cassava pulp was tested with a static method that controlled the temperature at 30, 50 and 70°C and controlled relative humidity in a range 10–90% with standard saturated salt solutions as LiCl, MgCl2, NaBr, NaCl and KNO3. Five equations of equilibrium moisture isotherm were analysed to predict the equilibrium moisture content, which was a guideline to develop a new isotherm equation. The experimental results showed that the equilibrium

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Charnkeitkong, Panida, and Siriporn Sripiboon. "Potassium Hydroxide Activation as an Adsorbent for Equilibrium Isotherms of Hexavalent Chromium Adsorptions onto <i>Garcinia mangosteen</i> Shell." Materials Science Forum 1086 (April 27, 2023): 107–14. http://dx.doi.org/10.4028/p-ta8d2y.

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The equilibrium isotherms of hexavalent chromium adsorption from water on potassium hydroxide (KOH) activated for mangosteen shell as an adsorbent by carbonization at 400 °C for 2 hours has been researched. The effective specific surface area of a biochar adsorbent is 164 m2/g, and its hexavalent chromium adsorption capacity can be encountered to be replied to on the pH 2.0 with initial feed concentration and temperature. The equilibrium adsorption isotherm models based on the Freundlich, Langmuir, Temkin, Hurkins-Jura, Halsay, Dubinin-Radushkevich, and Jovanovic models have been accompanied t

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Setyawan, N., Clarissa, E. Y. Purwani, and A. Budiyanto. "Moisture Sorption Isotherm Characteristic of Composite Flour (Cassava, Rice, Sorghum, and Sago) at Various Fitting Models." IOP Conference Series: Earth and Environmental Science 1024, no. 1 (2022): 012053. http://dx.doi.org/10.1088/1755-1315/1024/1/012053.

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Abstract Cassava, rice, sorghum, and sago flour can be mixed into composite flour. The properties of composite flour easily absorb water, so it is necessary to know the isotherm sorption through various models, such as Brunauer-Emmet-Teller (BET), Oswin, Hasley, Henderson, Caurie, Chen-Clayton and Guggenheim, Anderson, and Boer (GAB). Information on the sorption properties of foods is of great importance in food dehydration, especially in the quantitative approach to predicting the shelf life of dried foods such as flour. This research aims to determine the sorption isotherms of composite flou

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Ding, Wei, Shuqin Bai, Haorong Mu, and Gaowa Naren. "Investigation of phosphate removal from aqueous solution by both coal gangues." Water Science and Technology 76, no. 4 (2017): 785–92. http://dx.doi.org/10.2166/wst.2017.241.

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Equilibrium studies were carried out for the adsorption of phosphate onto newly discharged coal gangue and spontaneous combustion coal gangue, which are industrial solid residues. The experimental data were fitted to the two-parameter equations of Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich and the three-parameter equations of the Redlich-Peterson, Sips and Toth isotherms by non-linear method. All three-parameter isotherm equations have a higher correlation coefficient than the two-parameter isotherm equations. For new discharged coal gangue, the maximum phosphate adsorption capacit

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18

James, François, Mauricio Sepúlveda, and Patrick Valentin. "Statistical Thermodynamics Models for Multicomponent Isothermal Diphasic Equilibria." Mathematical Models and Methods in Applied Sciences 07, no. 01 (1997): 1–29. http://dx.doi.org/10.1142/s0218202597000025.

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We propose in this paper a whole family of models for isothermal diphasic equilibrium, which generalize the classical Langmuir isotherm. The main tool to obtain these models is a fine modeling of each phase, which states various constraints on the equilibrium. By writing down the Gibbs conditions of thermodynamical equilibrium for both phases, we are led to a constrained minimization problem, which is solved through the Lagrange multipliers. If one of the phases is an ideal solution, we can solve explicitly the equations, and obtain an analytic model. In the most general case, we have implicit

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J. B, Bidias,, Mouthe Anombogo G. A., Ndjeumi C. C, Djomdi Djomdi, Tchaya G. B., and Nsouandele J. L. "Study of Water Desorption Isotherms from Cocoa Beans (Theobroma Cacao L.) of Cameroon." European Scientific Journal, ESJ 18, no. 11 (2022): 1. http://dx.doi.org/10.19044/esj.2022.v18n11p1.

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The aim of this work was the determination of desorption isotherms from cocoa beans at different temperatures (20°C, 30°C, 35°C, 40°C and 45°C), moisture ratio (10% and 90%). Gravimetric method and different temperatures were used to get the experimental moisture ratio at equilibrium. Experimental data were adjusted to mathematical isotherm models frequently used for the hygroscopic representation of agricultural products. Cocoa beans varied from 0 to 13% moisture ratio equilibrium. Obtained results showed that the moisture ratio at equilibrium decreases as temperature increases for the same r

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Kulkarni, Kavita, Rahul Kulkarni, Yogesh Chendake, Arghya Garg, and Pragati Srivastava. "Adsorptive Removal of Acetic Acid by Walnut Shell as Low-Cost Adsorbent." Asian Journal of Chemistry 34, no. 9 (2022): 2318–24. http://dx.doi.org/10.14233/ajchem.2022.23851.

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Walnut shell was used as an adsorbent for adsorption of acetic acid. Batch experiments were conducted for adsorption equilibrium studies and kinetics by using walnut shell. Optimization of parameters like temperature, rotation, adsorbent dose and contact time were studied. Amount of acetic acid adsorbed was analyzed by titration. Equilibrium condition was investigated. Adsorption kinetics were tested for different models and found best suitable for intraparticle diffusion model. The batch experimental data was fitted to Langmuir, Freundlich, Temkin, Sips and Redlich-Peterson isotherms. The bes

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Yang, Zi Ze, Wang Xiao, Chun Ma, Li Hua Lv, Chun Yan Wei, and Byung Gil Min. "Kinetics and Thermodynamics of Cd(II) Sorption onto Sodium Alginate/Poly(Vinyl Alcohol)/Hydroxyapatite Composite Fiber." Materials Science Forum 743-744 (January 2013): 480–85. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.480.

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In this paper, the sodium alginate (SA)/poly (vinylalcohol)(PVA)/hydroxyapatite (HAp) fiber was prepared via solution spinning. The adsorption properties of SA/PVA/HAp composite fiber were studied,and the adsorption kinetics and isotherms were investigated. The experimental results showed that the adsorption process was fast, in which half-equilibrium and equilibrium was obtained in 5 and 30 minutes, respectively. The pseudo-second-order kinetic model provided a better correlation of the experimental results. Both of Langmuir isotherm and Freundlich isotherm could describe the adsorption behav

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Burden, Conrad J., Yvonne E. Pittelkow, and Susan R. Wilson. "Statistical Analysis of Adsorption Models for Oligonucleotide Microarrays." Statistical Applications in Genetics and Molecular Biology 3, no. 1 (2004): 1–27. http://dx.doi.org/10.2202/1544-6115.1095.

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Recent analyses have shown that the relationship between intensity measurements from high density oligonucleotide microarrays and known concentration is non linear. Thus many measurements of so-called gene expression are neither measures of transcript nor mRNA concentration as might be expected.Intensity as measured in such microarrays is a measurement of fluorescent dye attached to probe-target duplexes formed during hybridization of a sample to the probes on the microarray. We develop several dynamic adsorption models relating fluorescent dye intensity to target RNA concentration, the simple

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Nieszporek, Krzysztof, and Tomasz Banach. "Theoretical prediction of gas adsorption kinetics based on equilibrium data." Canadian Journal of Chemistry 90, no. 10 (2012): 828–35. http://dx.doi.org/10.1139/v2012-064.

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Based on the equilibrium adsorption isotherms, new expressions describing the rate of adsorption were developed. The theoretical model takes into account the influence of diffusional effects on the rate of adsorption. Other nonideal effects such as surface energetic heterogeneity or intermolecular interactions can be taken into account by using the adequate equilibrium isotherm. The accuracy of the presented rate equations was verified using real adsorption systems.

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Chen, Chiachung. "Evaluation of Equilibrium Sorption Isotherm Equations." Open Chemical Engineering Journal 7, no. 1 (2013): 24–44. http://dx.doi.org/10.2174/1874123101307010024.

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The sorption isotherm is important information for evaluating the ability of an adsorption system to treat the industrial waste water. In this study, eleven datasets from literatures were selected and three two-parameter and three-parameter equations were used to evaluate adsorption systems. Quantitative criteria included six error functions, and the quantitative criterion was residual plots. Isotherm constants differed by linearization and nonlinear regression analysis, especially for the three-parameter equations. The results indicated the inconsistent results of the error functions for sele

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Luthra, Kaushik, Soraya Shafiekhani, Sammy S. Sadaka, and Griffiths G. Atungulu. "Determination of Moisture Sorption Isotherms of Rice and Husk Flour Composites." Applied Engineering in Agriculture 36, no. 6 (2020): 859–67. http://dx.doi.org/10.13031/aea.13822.

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HighlightsMoisture sorption isotherms of rice and husk flour composites were determined.Adsorption isotherms were best modeled by the Chung-Pfost and Oswin equations.Desorption isotherms were best modeled by the Polynomial and Chung-Pfost equations.The Modified Oswin model was the best for both adsorption and desorption.Abstract. Empirical models describing isotherms specifically for adsorption and desorption have not been described for rough rice and husk flour composites. Such models are vital for process control and monitoring operations which use rice husk and rice flours or their mixtures

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Abed M., Eman, Lahieb Faisal M., and Younis Swadi T. "Removal of Cadmium Ions from Wastewater by Batch Experiments." Iraqi Journal of Chemical and Petroleum Engineering 17, no. 3 (2016): 101–8. http://dx.doi.org/10.31699/ijcpe.2016.3.9.

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Adsorption experiments were carried out using two different low-cost sorbent materials, date seeds and olive seeds. These sorbents used as a single phase (not as mixture) to remove cadmium ions from simulated wastewater by adsorption process. The equilibrium time was found at 2 hr. The experiments include different parameters such sorbent type and weight and contact time. It was found that both of olive seed and date seed have approximately the same adsorption capacity (qm) with 15.644 mg/g and 15.2112 mg/g, respectively. Equilibrium isotherms and kinetic studies have been carried out. Langmui

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Fodeke, A. A., and O. J. Ayejuyone. "Adsorption of methylene blue on corncob charcoal: Thermodynamic studies." Ife Journal of Science 23, no. 1 (2021): 131–44. http://dx.doi.org/10.4314/ijs.v23i1.13.

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To obtain the thermodynamic properties of adsorption of methylene blue (MB) on corncob carbonaceous adsorbents - untreated (UCC) and acid treated (TCC) - their equilibrium adsorption was determined between 10 o– 40o C at different pH conditions. The adsorption isotherms were fitted to Freundlich, Langmuir and Temkin isotherm models. The point of zero charge of each of the adsorbents was also determined. The point of zero charge was 10.58 ±0.09 for TCC, and 7.55 ± 0.10 for UCC. Only Freundlich model could account for the observed thermodynamic properties of MB adsorption by the adsorbents, thou

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Shi, Jingbo, Yasuo Kawai, Stavros Avramidis, Jiabin Cai, and Huijun Dong. "Water sorption hysteresis in wood near 100 °C." Holzforschung 75, no. 1 (2021): 13–21. http://dx.doi.org/10.1515/hf-2019-0228.

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AbstractWhether water sorption hysteresis exists above 75 °C and the representation of its relationship with wood softening remains unclear. In this study, sorption hysteresis at three temperature levels, namely, 75, 90 and 99.5 °C, was investigated using accurately controlled conditioning chambers using powder samples from seven wood species. The dry mass loss percentage of the samples and proper equilibrium time was evaluated by pretests to ensure reliable sorption isotherms afterwards. The dry mass loss percentage after the entire sorption isotherm running needs to be kept within 0.5% to av

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DVORETSKY, D. S., S. I. DVORETSKY, E. I. AKULININ, K. I. MERONYUK, and V. B. USACHEV. "SIMULATION OF THE CO2, CO, CH4 SORPTION EQUILIBRIUM USING THE DUBININ-ASTAKHOV EQUATION ON NAX ZEOLITE AND ACTIVATED CARBON IN THE PROCESS OF HYDROGEN MIXTURE SEPARATION." Herald of Technological University 27, no. 6 (2024): 116–22. http://dx.doi.org/10.55421/1998-7072_2024_27_6_116.

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Using CO2, CO, CH4 experimental isotherms, the inverse problem of sorption equilibrium is solved. It was determine the Dubinin-Astakhov isotherm equation coefficients and construct modeling approximating dependencies that allow calculating a continuous field equilibrium components concentration values in the temperature range of 293-333 K and pressures (1-20)×105 Pa of the hydrogen gas mixture separation process. The approximating dependencies coefficients average values are calculated based on three temperature values (at the boundaries of the interval and the average temperature) in the gas

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Benzaoui, Thouria, Ammar Selatnia, and Djaafar Djabali. "Adsorption of copper (II) ions from aqueous solution using bottom ash of expired drugs incineration." Adsorption Science & Technology 36, no. 1-2 (2017): 114–29. http://dx.doi.org/10.1177/0263617416685099.

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The use of bottom ash of expired drugs incineration for removal of Cu(II) ions from aqueous solution has been investigated. Analytical techniques have been employed to find characteristics of adsorbent materials. The removal of Cu(II) was conducted in batch system, and the effects of pH, adsorbent dosage, initial concentrations of copper ions, and contact time on adsorption efficiency were studied. Optimum adsorption was achieved at a pH 5 and equilibrium was established within 15 min of the process. The equilibrium adsorption data were analyzed using eight adsorption isotherm models: Langmuir

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Hsiao, H. C., S. M. Yih, and M. H. Li. "Adsorption Equilibrium of Xylene Isomers and p-Diethylbenzene in the Liquid Phase on a Y Zeolite." Adsorption Science & Technology 6, no. 2 (1989): 64–82. http://dx.doi.org/10.1177/026361748900600202.

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The saturated adsorptive capacity, adsorption equilibrium constant and adsorption isotherms of p-xylene, m-xylene, ethylbenzene (EB) and p-diethylbenzene (PDEB) on a K–BaY zeolite with n-heptane as the solvent have been studied at 25°C. The adsorption isotherms of the six binary pairs of these solutes with n-heptane as the solvent have also been determined at 25°C. The data cover a concentration range of xylene isomers from 0.05–0.3 mmol/ml. The molar adsorption capacity of the K–BaY zeolite for the different sorbates was found to be in the order: p-xylene > EB > m-xylene ≈ PDEB. PDEB is

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Ou, Hong Xiang, Yu Jun Song, Ling Rui Li, and Wei Hong Huang. "Adsorption of Pb(II) by Silica/Yeast Composites from Aqueous Solution: Kinetic and Equilibrium Studies." Advanced Materials Research 496 (March 2012): 476–79. http://dx.doi.org/10.4028/www.scientific.net/amr.496.476.

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Silica/yeast composites were prepared for removal of Pb(II) from aqueous solution. The effects of pH, contact time and initial concentration were examined. The optimum pH was 5.0. The kinetic data were investigated by pseudo-ﬁrst-order and pseudo-second-order models. The kinetic rates were better fitted to the pseudo-second-order model. The experimental data were fitted with the Langmuir and Freundlich models to analyze the equilibrium isotherms. The maximum adsorption capacity calculated from Langmuir isotherm was 73.53 mg/g. The Langmuir isotherm was more favorable to describe the experiment

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Dada, A. O., J. O. Ojediran, and Abiodun Paul Olalekan. "Sorption of Pb2+ from Aqueous Solution unto Modified Rice Husk: Isotherms Studies." Advances in Physical Chemistry 2013 (March 18, 2013): 1–6. http://dx.doi.org/10.1155/2013/842425.

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Investigation of the sorption potential of rice husk, an agricultural waste, as an adsorbent was carried out. The rice husk was modified with orthophosphoric acid and was used for adsorption of lead (II) ions (Pb2+) from aqueous solution. Physicochemical properties of the modified rice husk were determined. Equilibrium sorption data were confirmed with Langmuir, Freundlich and Temkin adsorption isotherms. On the basis of adsorption isotherm graphs, R2 values were determined to be 0.995, 0.916, and 0.797 for Langmuir, Temkin, and Freundlich isotherms, respectively, indicating that the data fitt

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Tarbuka, P. F., and R. H. Gumus. "Methylene Blue and Iron (II) Adsorption onto Raphia Hookeri Seed: A Comparative Equilibrium Isotherm Study." International Journal of Chemical and Process Engineering Research 8, no. 1 (2021): 11–18. http://dx.doi.org/10.18488/journal.65.2021.81.11.18.

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In this study, activated carbon prepared from Raphia hookeri seed was employed as an adsorbent to take up methylene blue (an organic ion-in-solution) and iron (II), a metal ion-in-solution. The biosorbent was prepared using chemical activation using sodium hydroxide (NaOH) as an impregnating agent. Calibration was performed with a focus on the change in the adsorbate concentration. The equilibrium isotherms study was conducted by considering a range of sorbate concentrations, to determine the optimal conditions for the adsorption systems. The same sorbate volume (10 ml), and the same dosage (0

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Hong, Yong Pyo, and Keon Sang Ryoo. "Adsorption Of No3--N And Po43--P in Aqueous Solution Using Granular Activated Charcoal (Gac)." JOURNAL OF ADVANCES IN CHEMISTRY 15, no. 2 (2018): 6296–305. http://dx.doi.org/10.24297/jac.v15i2.7881.

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In this study, adsorption of NO3- -N and PO43--P on granular activated charcoal (GAC) was investigated depending on pH, agitation time, GAC dosage, adsorption capacity and adsorption isotherms by employing batch adsorption type. The GAC was characterized by thermogravimetric analysis (TG-DTA), scanning electron micrograph coupled with energy-dispersive X-ray spectroscopy (SEM-EDX) and BET surface area analyzer. The GAC exhibited nearly similar adsorption equilibrium time. Both NO3--N and PO43—P appeared to approach equilibrium after approximately 4 h of agitation time. In the adsorption equili

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Lee, Jun Sian, Shahab Sokhansanj, C. Jim Lim, Anthony Lau, and Tony Bi. "Comparative Analysis of Sorption Isotherms for Wood Pellets and Solid Wood." Applied Engineering in Agriculture 35, no. 4 (2019): 475–79. http://dx.doi.org/10.13031/aea.13238.

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Abstract.The published data on equilibrium moisture content vs. equilibrium relative humidity (EMC-ERH) for wood pellet do not cover the range of temperature and relative humidity to which a pellet is exposed to during its storage and handling. A few published EMC-ERH relations covering a wider range of temperatures and relative humidity are available for solid wood (lumber) and wood chips. The question is whether the data for solid wood is applicable to wood pellets. For this research, we examined the sorption isotherms of wood pellets and solid wood. The analysis shows that EMC for solid woo

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McKay, Gordon, Mohammed El-Geundi, and Mamdouh M. Nassar. "Adsorption Model for the Removal of Acid Dyes from Effluent by Bagasse Pith Using a Simplified Isotherm." Adsorption Science & Technology 15, no. 10 (1997): 737–52. http://dx.doi.org/10.1177/026361749701501002.

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The adsorption of two acid dyes, viz. Acid Red AR114 and Acid Blue AB25, on to bagasse pith, a waste material from the sugar cane industry, has been studied. Equilibrium isotherms and agitated batch contact time studies have been carried out. A mass-transfer model has been used based on a Langmuir-type isotherm at maximum saturation. This simple or pseudo-irreversible isotherm and the assumption of pore diffusion enables a pore diffusion mass-transfer model to theoretically predict the experimental concentration decay curves very rapidly.

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Abasi, Cyprian Yameso, Onyinyechi Gift Aliene, and Sheila Yabiteighha. "Sorption Equilibrium Behaviour of Post-Characterized Bio-Filled Waste PET (RIC-1) Bottles Composites." International Journal of Research and Scientific Innovation XII, no. I (2025): 359–73. https://doi.org/10.51244/ijrsi.2025.12010030.

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The sorption equilibrium of characterized bio-filled waste PET(RIC-1) bottle composites was investigated. Composites were made by melt-mixing of PET(RIC-1) matrix and bio-fillers as crab shell, clay, and chitin. The adsorption capacities of the binary and ternary composites for Fe (III) ions were determined through equilibrium methods from adsorption isotherm models. In terms of equilibrium isotherm application, the ternary composites PET/CHITIN/CLAY and PET/CBS/CLAY fitted best with the Langmuir isotherm (R2 = 0.9861) than the Freundlich isotherm (R2 = 0.9411). The Freundlich isotherm was bet

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Al-Rufaie, M. M., Z. T. A. Alsultani, and A. S. Waheed. "Adsorption kinetics and thermodynamics of Azure C dye from aqueous solution onto activated charcoal." Koroze a ochrana materialu 60, no. 3 (2016): 80–85. http://dx.doi.org/10.1515/kom-2016-0013.

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Abstract Adsorption thermodynamics and kinetics of Azure C and from the aqueous solution on activated charcoal was examined. The charcoal was activated by concentrated sulphuric acid and the adsorption kinetic and thermodynamic was tested in batch experiment. An experiments used the adsorption batch method to observe the effect of the variable parameters, i.e. concentration of dye, time of contact, pH, temperature and adsorbent dose. The ideal dosage of adsorbent was 0.3 g for Azure C. The equilibrium state was reached within 60 min for dye Azure C at activated charcoal. The isotherms of equil

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Shim, Wang-Geun, Hyun-Chul Kang, Chan Kim, et al. "Heterogeneity Analysis of Single-Walled Carbon Nanotubes from the Adsorption Equilibria of Nitrogen and Benzene." Journal of Nanoscience and Nanotechnology 6, no. 11 (2006): 3583–88. http://dx.doi.org/10.1166/jnn.2006.17987.

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Nitrogen adsorption/desorption isotherms and gravimetric methods were employed to examine the structural and adsorption properties of selected adsorbent. The equilibrium data of benzene were also obtained at three different temperatures (303.15, 313.15, and 323.15 K) with pressures up to 7 kPa. The results of nitrogen and benzene sorption isotherm revealed that SWCNTs exhibit type II with the features of type I. The Toth and UNILAN models were found to provide a reasonable correlation between the adsorption isotherm data. In addition, the adsorption second virial coefficient and the isosteric

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Overah, L. C. "Nonlinear Kinetic and Equilibrium Adsorption Isotherm Study of Cadmium (II) Sorption by Dacryodes edulis Biomass." Nigerian Journal of Basic and Applied Sciences 28, no. 2 (2021): 10–19. http://dx.doi.org/10.4314/njbas.v28i2.2.

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The kinetics and equilibrium adsorption isotherm of cadmium (II) adsorption onto Dacryodes edulis (native peer seed) biomass was studied using a nonlinear approach, which is unpopular but proven in some literature to be more reliable and easier. In optimizing the process, about 98% removal of the cadmium ion was achieved within five minutes at pH 7 by contacting just 30 mg of the Dacryodes edulis seed biomass with the adsorbate solution of a concentration of 100 mg/L. Non-linear investigation of the kinetics and adsorption isotherms of the process was done using the R console statistical and c

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Kuipa, Pardon K., and Olga Kuipa. "Removal of Pyrethrin from Aqueous Effluents by Adsorptive Micellar Flocculation." Journal of Chemistry 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/735631.

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The equilibrium adsorption of pyrethrin onto aggregates formed by the flocculation of micelles of the surfactant sodium dodecyl sulphate (SDS) with aluminium sulphate is reported. The experimental results were analysed using different adsorption isotherms (Langmuir, Freundlich, Redlich-Peterson, Sips, Radke-Prausnitz, Temkin, linear equilibrium, and the Dubin-Radushkevich isotherms). The Freundlich and linear equilibrium isotherms best describe the adsorption of pyrethrin onto SDS micellar flocs, with the Freundlich adsorption constant,KF, and the mass distribution coefficient,KD, of 64.266 ((

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Kešelj, Dragana, Dragica Lazić, and Zoran Petrović. "Use of Total Organic Carbon Analyzer in Isotherm Measurements of Co-Adsorption of VOCs and Water Vapor from the Air." Acta Chimica Slovenica 69, no. 4 (2022): 803–10. http://dx.doi.org/10.17344/acsi.2022.7553.

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The binary adsorption isotherms of volatile organic compounds (VOCs), and water vapor from the air have been the focus of much research in recent years. The content of adsorbed VOCs in the presence of water vapor can be determined by the volumetric or gravimetric method, in a static or dynamic mode. This study focuses on the adsorption technique in a static mode for isotherm measurement of the co-adsorption of VOCs and water vapor from the air using the gravimetric method. The content of VOCs is determined using a total organic carbon analyzer, while the amount of the adsorbed water was calcul

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Journal, Baghdad Science. "Adsorption Study for Trifluralin on Iraqi ? –Alumina." Baghdad Science Journal 9, no. 1 (2012): 153–59. http://dx.doi.org/10.21123/bsj.9.1.153-159.

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Equilibrium adsorption isotherm for the removal of trifluralin from aqueous solutions using ? –alumina clay has been studied. The result shows that the isotherms were S3 according Giels classification. The effects of various experimental parameters such as contact time, adsorbent dosage, effect of pH and temperature of trifluralin on the adsorption capacities have been investigated. The adsorption isotherms were obtained by obeying freundlich adsorption isotherm with (R2 = 0.91249-0.8149). The thermodynamic parameters have been calculated by using the adsorption process at five different tempe

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SD, Pardeshi. "Kinetic and Equilibrium Studies of Methylene Blue Adsorption on Alstonia Scholaris Plant Leaf Powder." Physical Science & Biophysics Journal 7, no. 1 (2023): 1–7. http://dx.doi.org/10.23880/psbj-16000249.

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In the current work the methylene blue removal using leaf powder of Alstonia Scholaris was investigated. Pseudo first order, second order and Elovic model ware applied, it has been observed that the adsorption follows second order kinetic model. The isotherm study was done by using Langmuir, Temkin and Freundlich isotherm, the Freundlich isotherm was best suited for present investigation. The maximum adsorption was observed at pH 7.5.

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Ugbe, Fabian Audu, Patrick Onuh Anebi, and Victoria Abiola Ikudayisi. "Biosorption of an Anionic Dye, Eosin Yellow onto Pineapple Peels: Isotherm and Thermodynamic Study." International Annals of Science 4, no. 1 (2018): 14–19. http://dx.doi.org/10.21467/ias.4.1.14-19.

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Eosin Yellow (EY), an anionic dye (acid dye) was adsorbed using an agricultural waste, pineapple peels (PP) as bio-sorbent in order to investigate its suitability as an alternative adsorbent, and to give insight into the mechanisms of binding. The study includes: equilibrium isotherms and thermodynamics studies. The adsorption isotherm and thermodynamics experiments were conducted using batch equilibrium techniques. The adsorption data were fitted into Langmuir, Freundlich and Temkin isotherm models; as a result, the data fitted well into the Langmuir model from which the adsorption capacity,

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CASTRO, Douglas Azevedo, Douglas Henrique PEREIRA, and Paulo Vitor Brandão LEAL. "LANGMUIR ISOTHERM: KINETIC AND EQUILIBRIUM CONSIDERATIONS." Periódico Tchê Química 16, no. 31 (2019): 324–34. http://dx.doi.org/10.52571/ptq.v16.n31.2019.330_periodico31_pgs_324_334.pdf.

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Adsorption processes present increasing applications in the most diverse matrices of systems. In this scenario the Langmuir isotherm has highlight and importance. Although it is the simplest isotherm model, in most adsorption studies it is considered, since it is the basis for the formulation of almost all other models proposed in literature. Thus the Langmuir model is applied in the most diverse types of adsorption processes, such as: removal of metallic ions, organic compounds, pollutants generated by agriculture, dyes, mining effluents, among others. The types of adsorbents are also the mos

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Yildiz, Sayiter. "Kinetic and Isotherm Analysis of Cu(II) Adsorption onto Almond Shell (Prunus Dulcis)." Ecological Chemistry and Engineering S 24, no. 1 (2017): 87–106. http://dx.doi.org/10.1515/eces-2017-0007.

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Abstract In the work, adsorption of Cu2+ ions onto almond shell were investigated under different operational conditions. Almond shell was used without any pretreatment prior to the tests. The optimum conditions for adsorption of Cu2+ ions through almond shell were determined to be; pH 5.0, temperature 20°C, shaking rate 125 rpm, sorbent dose 0.3 g and initial Cu2+ ion concentration 50 mg/dm3. The equilibrium duration of the system was 60 minutes. The sorption capacities of the sorbents were predicted with the aid of equilibrium and kinetic models. The interactions of peanut shell with metal i

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Asnaoui, H., A. Laaziri, and M. Khalis. "Study of the kinetics and the adsorption isotherm of cadmium(II) from aqueous solution using green algae (Ulva lactuca) biomass." Water Science and Technology 72, no. 9 (2015): 1505–15. http://dx.doi.org/10.2166/wst.2015.359.

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Batch experiments were conducted to study the adsorption of hazardous cadmium onto low-cost algae biomass in aqueous solution with respect to concentration of adsorbate, adsorbent dosage, contact time, solution pH and temperature. Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms and the isotherm constants were determined. The activation energy of adsorption was also evaluated for the adsorption of cadmium onto Ulva lactuca biomass. Experimental data were tested in terms of biosorption kinetics using pseudo-first-order and pseudo-second-order kinetic

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Davoud, Balarak, Kord Mostafapour Ferdos, and Azarpira Hossein. "Water remediation using Rice shell-based activated carbon for removal of Sulfamethoxazole: Error analysis." Pharmaceutical and Chemical Journal 3, no. 3 (2016): 71–77. https://doi.org/10.5281/zenodo.13759571.

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The Rice shell was used as a low cost adsorbent to produce activated carbon (AC) for the removal of sulfamethoxazole (SMZ) from aqueous solution at batch systems. Equilibrium data were fitted to Langmuir, Freundlich, Redlich–Peterson and Sips isotherms. The equilibrium data were best represented by the Langmuir isotherm. maximum monolayer capacity of AC obtained from Langmuir is 78.25 mg/g. The adsorption kinetics was found to be best represented by Pseudo second order kinetic model. Equilibrium and Kinetic Studies further supported by the error analysis functions (ARE, EABS, X<sup>2</su

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