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Journal articles on the topic 'Langmuir model and Adsorption isotherm'

Author: Grafiati

Published: 5 June 2025

Last updated: 16 July 2025

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1

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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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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3

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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Liu, Xiangyao, Baohui Wang, Guolin Jing, and Ya'nan Sun. "Adsorption behaviors of methylene blue on sunflower stem pith." Water Science and Technology 79, no. 8 (2019): 1458–66. http://dx.doi.org/10.2166/wst.2019.142.

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Abstract Adsorption behaviors of methylene blue (MB) from aqueous solution using sunflower stem pith (SSP) as adsorbent were investigated. The effects of adsorption conditions such as adsorption time, initial concentration of MB and dosage of SSP on the detoxification of MB were examined. The equilibrium adsorption data were analyzed using three well-known isotherms: Langmuir, Freundlich and Temkin. The results indicated that the Langmuir isotherm fitted well to the data as compared with another isotherm model. The maximum adsorption capacity calculated by the Langmuir isotherm model was 277 m

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Javed, Ifrah, Muhammad Asif Hanif, Umer Rashid, Farwa Nadeem, Fahad A. Alharthi, and Elham Ahmed Kazerooni. "Enhancing Functionalities in Nanocomposites for Effective Dye Removal from Wastewater: Isothermal, Kinetic and Thermodynamic Aspects." Water 14, no. 17 (2022): 2600. http://dx.doi.org/10.3390/w14172600.

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The adsorption process combined with electrocoagulation is a highly effective technique for dye removal. Calcinized and non-calcinized composites based on bentonite and sodium zeolite were prepared for adsorptive removal of Foron EBL blue, Terasil brown 2RFL, Torque blue PG, and Orange P3R dyes. Factors affecting the adsorption process, such as contact time, initial dye concentration, and temperature, were also explored in this study. Equilibrium data of natural clay composites was explained by Freundlich, Langmuir, Dubinin Radushkevich isotherm, Harkin Jura, and Temkin isothermal models. Hark

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Syauqiah, I., D. Nurandini, N. P. Prihatini, and Jamiyaturrasidah. "Determination of rice husk activated Carbon capacity in adsorption of Cu Metal from Sasirangan liquid waste based on isotherm model." IOP Conference Series: Materials Science and Engineering 1212, no. 1 (2022): 012019. http://dx.doi.org/10.1088/1757-899x/1212/1/012019.

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Abstract The process of manufacturing Sasirangan - a traditional fabric of South Kalimantan - has an impact that affects environmental pollution, namely the dyeing process of the fabric. The synthetic dyes used contain heavy metals and one of those toxic metals is copper (Cu). This study aims to determine the adsorption capacity of rice husk activated carbon adsorbent by adjusting the adsorption pattern based on isotherm models as the treatment to sasirangan liquid waste. The method consists of three stages: preparation of adsorbent by carbonization process, chemical and physical activation, t

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7

He, Shao Hua, Dan Wang, Qing Qiu Kong, and Xi Wu. "Thermodynamic Studies for Adsorption of Cd²⁺ and Pb²⁺ from Waster Water on Modified Walnut Shell." Applied Mechanics and Materials 737 (March 2015): 622–26. http://dx.doi.org/10.4028/www.scientific.net/amm.737.622.

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The adsorption isothermal curve and thermodynamic adsorption of Cd2+ and Pb2+ on modified walnut shell from waster water were investigated using batch technique. The equilibrium adsorption data are fitted to Langmuir and Freundlich isotherm models and the model parameters are evaluated. The Langmuir isotherm model shows a better fit to adsorption data than the Freundlich isotherm model for the sorption of Cd2+ and Pb2+ on modified walnut shell. The maximum adsorption capacity of Cd2+ and Pb2+ by modified walnut shell is found to be 32.68 mg·g-1 and 84.75 mg·g-1 at 298K temperature, respectivel

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8

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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Oyedoh, Eghe A., and Michael C. Ekwonu. "EXPERIMENTAL INVESTIGATION ON CHROMIUM(VI) REMOVAL FROM AQUEOUS SOLUTION USING ACTIVATED CARBON RESORCINOL FORMALDEHYDE XEROGELS." Acta Polytechnica 56, no. 5 (2016): 373–78. http://dx.doi.org/10.14311/ap.2016.56.0373.

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The adsorption of chromium(VI) metal ion in aqueous solutions by activated carbon resorcinol formaldehyde xerogels (ACRF) was investigated. The results showed that pore structure, surface area and the adsorbent surface chemistry are important factors in the control of the adsorption of chromium(VI) metal ions. The isotherm parameters were obtained from plots of the isotherms and from the application of Langmuir and Freundlich Isotherms. Based on regression analysis, the Langmuir isotherm model was the best fit. The maximum adsorption capacity of ACRF for chromium (VI) was 241.9 mg/g. The pseud

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10

Duan, Xinhui, C. S. Kannan, Chengcheng Zhang, and Xin Wang. "Waste walnut shell valorization to iron loaded biochar and its application to arsenic removal." Resource-Efficient Technologies, no. 1 (March 12, 2017): 29–36. http://dx.doi.org/10.18799/24056529/2017/1/111.

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Iron loaded biochar (ILB) was prepared from waste walnut shell by microwave pyrolysis and its application for arsenic removal was attempted.The ILB was characterized using X-ray diffraction, scanning electron microscopy and BET Surface area analyzer. The adsorption isotherm of As(V) in ILB covering a temperature range of 25 to 45 °C, as well as the kinetics of adsorption at 25 °C were experimentally generated. Theadsorption isotherms were modeled using Langmuir and Freundlich isotherm models, while the kinetics of adsorption was modeled using thepseudo-first-order, pseudo-second-order kinetic

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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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12

Olafadehan, Olaosebikan A., and Alfred A. Susu. "Numerical Solution of Binary Liquid-Phase Adsorption onto Porocel Clay Using Linear, Freundlich and Langmuir Isotherms." Adsorption Science & Technology 23, no. 3 (2005): 195–213. http://dx.doi.org/10.1260/0263617054353627.

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A generalized mathematical model is presented to describe the process of multi-component adsorption onto porous media in fixed beds. The model was applied to the binary adsorption, without reaction, of aromatics and sulphur compounds onto a fixed bed of Porocel clay for kerosene deodorization using linear, Freundlich and Langmuir isotherms independently. A computational scheme for the solution of the model equations is presented. The scheme is based on orthogonal collocation for spatial discretization of the resulting set of coupled hyperbolic and parabolic partial differential equations for t

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13

Stepova, K., L. Sysa, and R. Konanets. "Nonlinear Fitting of Iron Sorption on Bentonite to Theoretical Isotherm Models." Physics and Chemistry of Solid State 23, no. 2 (2022): 270–76. http://dx.doi.org/10.15330/pcss.23.2.270-276.

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A comparative analysis of adsorption models application for the description of experimental isotherms of iron adsorption on two samples: natural bentonite and bentonite irradiated with microwave irradiation. Sorption isotherms are described using the theories of Langmuir, Freundlich, Redlich-Peterson and Langmuir-Freundlich. The constants and parameters of these equations are determined. Nonlinear fitting of experimental data to the theoretical models of isotherms showed that adsorption by native bentonite corresponds to the three-parameter Redlich-Peterson model, and microwave irradiated - to

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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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15

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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Chen, Jianlong, and Xinwei Lu. "Equilibrium and kinetics studies of Cd(II) sorption on zeolite NaX synthesized from coal gangue." Journal of Water Reuse and Desalination 8, no. 1 (2016): 94–101. http://dx.doi.org/10.2166/wrd.2016.137.

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Abstract The adsorption of Cd(II) from aqueous solution by synthesized zeolite NaX from coal gangue was investigated in a batch adsorption system. The studies include both equilibrium adsorption isotherms and kinetics. Different isotherm models were examined and the adsorption isotherm could be best represented with Langmuir. The adsorption kinetic experimental data were found to be better fitted with the pseudo-second-order kinetic model. An intra-particle diffusion model was employed to investigate the adsorption mechanism. The results showed that the intra-particle diffusion step was not th

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Mazumder, AZM Mainul Islam, Chowdhury Raihan Bikash, Md Ataur Rahman, and Md Mufazzal Hossain. "A Comparative Study for Adsorptive Removal of Remazol Red R and Remazol Black B from Aqueous Solution by ZnO." Dhaka University Journal of Science 66, no. 2 (2018): 121–27. http://dx.doi.org/10.3329/dujs.v66i2.54555.

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Adsorptive removal of remazol red R (RRR) and remazol black B (RBB) from aqueous solution has been investigated by using ZnO as an adsorbent. Time for adsorption equilibrium, kinetics of adsorption at different initial concentrations of dyes and adsorption isotherms at different temperatures have been studied. Adsorption capacity increased with increasing initial dye concentration. The pseudo first-order and pseudo second-order kinetics were used to describe kinetic data and the rate constants were evaluated. Experimental data fits better in the pseudo second-order kinetic model than in the ps

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18

Елена, ТУТОВАН, та ИСАК-ГУЦУЛ Татьяна. "ИЗУЧЕНИЕ АДСОРБЦИИ И КИНЕТИКИ АДСОРБЦИИ МЕТИЛЕНОВОГО СИНЕГО ИЗ ВОДНЫХ РАСТВОРОВ НА ТРЕПЕЛЕ". STUDIA UNIVERSITATIS MOLDAVIAE Științe Reale și ale Naturii, № 6(146) (2021): 149–57. https://doi.org/10.5281/zenodo.5702287.

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The adsorption of methylene blue dye (MB) on native natural tripol was studied. It has been established that MB adsorption on tripol increases with the growth of pH. The form of the MB adsorption isotherm on tripol is of the Langmuir type. There were determined the constants from the Langmuir isotherm (q<sub>max</sub> = 107.527 mg/g, K = 0.046 L/mg) and Freundlich isotherm (b = 10.021 mg/g, 1/n = 0.517) and it was established that the adsorption process is more accurately described by Langmuir model. It was detected that the equilibrium is established practically after 8 hours of the MB soluti

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Bhadusha, N., and T. Ananthabaskaran. "Adsorptive Removal of Methylene Blue onto ZnCl2Activated Carbon from Wood Apple Outer Shell: Kinetics and Equilibrium Studies." E-Journal of Chemistry 8, no. 4 (2011): 1696–707. http://dx.doi.org/10.1155/2011/429831.

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Methylene blue dye removal from aqueous solution was investigated using ZnCl2activated carbon prepared from wood apple outer shell (Limonia acidissima, biomass waste). Influence of agitation time, adsorbent dose, dye concentration, pH and temperature were explored. Two theoretical adsorption isotherms namely Langmuir and Freundlich were used to describe the experimental results. The Langmuir adsorption capacity (Qo) was found to be 35.1 mg/g and the equilibrium parameter (RL) values indicate favourable adsorption. The experimental data were well fitted with Langmuir isotherm model and pseudo s

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Akhalbedashvili, L., N. Gagniashvili, G. Todradze, and N. Loria. "ADSORPTION KINETICS AND ISOTHERM MODELS OF Cd(II), Zn(II), AND Cr(VI) BY GEORGIAN NATURAL AND MODIFIED FORMS OF MORDENITE." Chemical Problems 23, no. 1 (2025): 101–6. http://dx.doi.org/10.32737/2221-8688-2025-1-101-106.

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Environmental pollution with heavy metals is a problem of worldwide importance due to their toxicity and potential health risks. Among the heavy metals found in industrial waters are such toxic metals as Cd(II), Zn(II), and Cr(VI). In this study, the potential of Georgian natural and modified mordenite as a low-cost, eco-friendly adsorbent for the removal of cadmium (II), zinc (II), and chromium (IV) from aqueous solutions is studied. Langmuir and Freundlich isotherms are used to model adsorption data. Studies have shown that the correlation coefficient values (R2 ) were best fitted by the Lan

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Sahin, Rubina, and Kavita Tapadia. "Comparison of linear and non-linear models for the adsorption of fluoride onto geo-material: limonite." Water Science and Technology 72, no. 12 (2015): 2262–69. http://dx.doi.org/10.2166/wst.2015.449.

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The three widely used isotherms Langmuir, Freundlich and Temkin were examined in an experiment using fluoride (F−) ion adsorption on a geo-material (limonite) at four different temperatures by linear and non-linear models. Comparison of linear and non-linear regression models were given in selecting the optimum isotherm for the experimental results. The coefficient of determination, r2, was used to select the best theoretical isotherm. The four Langmuir linear equations (1, 2, 3, and 4) are discussed. Langmuir isotherm parameters obtained from the four Langmuir linear equations using the linea

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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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Ge, Mingliang, Xubin Wang, Mingyi Du, Guodong Liang, Guoqing Hu, and Jahangir S.M. "Adsorption Analyses of Phenol from Aqueous Solutions Using Magadiite Modified with Organo-Functional Groups: Kinetic and Equilibrium Studies." Materials 12, no. 1 (2018): 96. http://dx.doi.org/10.3390/ma12010096.

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Organically-modified magadiite (MAG–CTAB–KH550) was synthesized via ion-exchange method and condensation reaction in the presence of pure magadiite (MAG), cetyltrimethylammonium bromide (CTAB) and γ-aminopropyltriethoxysilane (KH550) in aqueous solution in this research. This new adsorbent material was studied using scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR), and N2 adsorption/desorption isotherms process. It was found that the MAG–CTAB–KH550 has high Brunaur-Emmet-Teller (BET) specific surface area and mesoporous pore size dist

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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 kine

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Chen, Qing, Yuanyuan Tian, Peng Li, et al. "Study on Shale Adsorption Equation Based on Monolayer Adsorption, Multilayer Adsorption, and Capillary Condensation." Journal of Chemistry 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/1496463.

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Shale gas is an effective gas resource all over the world. The evaluation of pore structure plays a critical role in exploring shale gas efficiently. Nitrogen adsorption experiment is one of the significant approaches to analyze pore size structure of shale. Shale is extremely heterogeneous due to component diversity and structure complexity. Therefore, adsorption isotherms for homogeneous adsorbents and empirical isotherms may not apply to shale. The shape of adsorption-desorption curve indicates that nitrogen adsorption on shale includes monolayer adsorption, multilayer adsorption, and capil

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Xu, Hong Ying, and Chan Zhang. "Kinetic and Equilibrium of Biosorption of Methylene Blue by Anaerobic Granular Sludge in Wastewater." Advanced Materials Research 550-553 (July 2012): 2291–95. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2291.

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With anaerobic granular sludge as adsorbent, the adsorption kinetics and thermodynamics of methylene blue (MB) from aqueous solution was studied by batch adsorption technique.The pseudo-first order, pseudo- second order models and Langmuir, Freundlich isotherms models were used to describe the kinetic data.The experimental results show that the anaerobic granular sludge had strong and fast speed adsorption capacity for MB adsorption in wastewater. The adsorption equilibrium could be reached in 2h, and the maximum adsorption rate was 98.6%. the pseudo-second order equation is the best model tha

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Kazmouz, Muhamad Yahia, and Attila Felinger. "The Competitive Adsorption of Water and Methanol on a Hybrid Silica Stationary Phase in Supercritical Fluid Chromatography." Separations 10, no. 9 (2023): 492. http://dx.doi.org/10.3390/separations10090492.

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This study investigates the adsorption of methanol, water, and their mixture in a hybrid silica stationary phase with supercritical carbon dioxide as a mobile phase in supercritical fluid chromatography (SFC). The adsorption isotherms of methanol and water were determined by two dynamic methods: the elution by characteristic point (ECP) method and the inverse method (IM). Both the single-component and competitive bi-Langmuir models were pre-selected for the inverse method. The initial parameters of the single-component isotherm for both methanol and water were estimated with the ECP method by

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Gajendiran, Vasu, Azucena Cuento, and Sivamani Selvaraju. "Nonlinear and Linear Analysis of Langmuir Adsorption Isotherm for Removal of Copper from its Aqueous Solution Using Cucumber Peel." Materials Science Forum 1059 (April 25, 2022): 171–77. http://dx.doi.org/10.4028/p-m3i770.

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Adsorption is a unit operation of separating solute from solution using another solid material. Modelling of experimental adsorption isotherm data is an essential way for predicting the mechanisms of adsorption, which will lead to an improvement in adsorption science. The main aim of the present work is to analyse various forms of Langmuir isotherm for adsorption of copper from its aqueous solution using cucumber peel from the batch experimental data. The linearized and nonlinearized isotherm models were compared and discussed. In order to determine the best fit isotherm model, the determinati

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Hastuti, Budi, Mudasir Mudasir, Dwi Siswanta, and Triyono Triyono. "Preparation and Pb(II) Adsorption Properties of Crosslinked Pectin-Carboxymethyl Chitosan Film." Indonesian Journal of Chemistry 15, no. 3 (2015): 248–55. http://dx.doi.org/10.22146/ijc.21192.

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A modified pectin has been synthesized by reacting/combining -OH group among pectin and chitosan with BADGE (Bisphenol A diglycidyl ether) crosslinker agent. The structure and morphology of the new material were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and X-ray Diffraction (XRD) analysis. Thermogravimetric studies showed an improvement in thermal characteristic. Adsorption experiments were performed in batch processes; sorption isotherms and kinetics were also studied. The Langmuir and Freundlich adsorption isotherm models were applie

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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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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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Liu, Wen Lei, Shan Lin Zhao, Shuang Cui, Shuang Chun Yang, and Li Yan Shang. "The Research on the Adsorptive Capability and Adsorption Isotherm of Modified Talcum Powder to Methylene Blue." Advanced Materials Research 610-613 (December 2012): 1443–48. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.1443.

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The preparation conditions of modified talcum powder were investigated by discuss the effects of nitric acid mass concentration, nitric acid soak temperature, roasting temperature and roasting time on adsorption properties of methylene blue by talcum powder. Methylene blue dye, as target pollutant, exhibits difficult biochemical degradable characters. The adsorption isotherm of adsorption process was discussed by using the Langmuir isotherm model and Freundlich isotherms model. The results show that the rate of adsorption of methylene blue decreased with the increasing of roasting temperatures

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Downarowicz, Dorota, and Katarzyna Ziętarska. "Adsorption of propan-1-ol vapour on Sorbonorit 4 activated carbon – equilibrium and dynamic studies." Polish Journal of Chemical Technology 19, no. 4 (2017): 59–64. http://dx.doi.org/10.1515/pjct-2017-0068.

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Abstract The study examined the adsorption of propan-1-ol (1PN) vapour on Sorbonorit 4 (S4) activated carbon in cyclic Electrothermal Temperature Swing Adsorption (ETSA) process. Dynamic adsorption capacity and breakthrough time were determined based on column studies. Thomas model was used to describe experimental breakthrough curves. Adsorption isotherms for 1PN vapour on S4 activated carbon were tested at 293 to 413 K. The experimental data were examined by using three multi-temperature isotherm models: Toth, Sips and hybrid Langmuir-Sips. Results indicate that S4 activated carbon is a hete

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Bhadusha, N., and T. Ananthabaskaran. "Kinetic, Thermodynamic and Equilibrium Studies on Uptake of Rhodamine B onto ZnCl2Activated Low Cost Carbon." E-Journal of Chemistry 9, no. 1 (2012): 137–44. http://dx.doi.org/10.1155/2012/873026.

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A carbonaceous adsorbent prepared from biomass waste like wood apple outer shell (Limonia acidissima) by ZnCl2treatment was investigated for its efficiency in removing Rhodamine B (RDB). Influence of agitation time, adsorbent dose, dye concentration, pH and temperature were explored. Two theoretical adsorption isotherms namely Langmuir and Freundlich were used to describe the experimental results. The Langmuir adsorption capacity (Qo) was found to be 46.7 mg/g and the equilibrium parameter (RL) values indicate favourable adsorption. The experimental data were well fitted with Langmuir isotherm

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El-Aassar, Mohamed R., Tamer M. Tamer, Mohamed Y. El-Sayed, et al. "Development of Azo Dye Immobilized Sulfonated Poly (Glycidyl Methacrylate) Polymer Composite as Novel Adsorbents for Water Treatment Applications: Methylene Blue Immobilization Isotherm, Kinetic, Thermodynamic, and Simulations Studies." Molecules 27, no. 23 (2022): 8418. http://dx.doi.org/10.3390/molecules27238418.

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Methylene blue (MB) immobilized onto a sulfonated poly(glycidyl methacrylate) (SPGMA) polymer composite has been developed as a novel adsorbent for water treatment applications. The MB adsorptions onto sulfonated poly(glycidyl methacrylate) polymer characters have been studied. The adsorption isotherms, namely Langmuir and Freundlich, have been investigated. Other isotherm models. As a compromise between the Freundlich and Langmuir isotherm models, such as the D–R isotherm and the Temkin isotherm, have been compared. The results indicated that the adsorption process followed the Freundlich iso

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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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Khaldun, Ibnu, Aristia Aristia, and Faucut Sarah. "PERBANDINGAN DAYA SERAP SERBUK GERGAJI KAYU DAMAR LAUT (SHOREA SP) DAN MERBAU (INTSIA SP) TERHADAP LOGAM Pb(II)." Jurnal IPA & Pembelajaran IPA 1, no. 1 (2018): 56–63. http://dx.doi.org/10.24815/jipi.v1i1.9567.

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Abstrak. Penelitian ini bertujuan untuk menginvestigasi kemampuan daya serap serbuk gergaji kayu damar laut (Shorea sp) dan merbau (Intsia sp) terhadap logam Pb(II) dari larutan, dan mempelajari pengaruh kondisi percobaan seperti pH larutan, waktu kontak, jumlah adsorben dan konsentrasi adsorbat. Efisiensi adsorpsi maksimum berturut-turut sebanyak 95,72% pada pH 4 dan 98,78% pada pH 5 oleh damar laut (Shorea sp) dan kayu merbau (Intsia sp). Adsorpsi timbal oleh kedua adsorben meningkat dengan bertambahnya waktu dan pH (dari 1 hingga 5) dan menurun dengan menurunnya kekuatan ion. Data kesetimba

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KOYUNCU, MENDERES. "Adsorption, kinetics, and thermodynamic study of dyeing the Scutellaria Orientalis L as an eco-friendly natural colourant on cotton fabric." Industria Textila 75, no. 02 (2024): 203–11. http://dx.doi.org/10.35530/it.075.02.202310.

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The adsorption isotherm, thermodynamic parameter, and kinetics study for dyeing without mordanting cotton fabric dyed with natural dye obtained from an aqueous extract of the Scutellaria Orientalis were investigated using, as optimal conditions, at pH of 5 a material to liquor ratio (MLR) of 1:100, an initial dye concentration of 1.0/l and contact time (20–90 min.). The effect of the temperature and dyeing time (from 20–90 min.) on dyeing was evaluated using three different temperatures (from 60, 80, and 90°C). Also, the adsorption isotherms have been analyzed by Langmuir and Freundlich models

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Alharbi, Reem Mohammed, Essam Nageh Sholkamy, Khawla Ibrahim Alsamhary, Neveen Abdel-Raouf, and Ibraheem Borie M. Ibraheem. "Optimization Study of the Capacity of Chlorella vulgaris as a Potential Bio-Remediator for the Bio-Adsorption of Arsenic (III) from Aquatic Environments." Toxics 11, no. 5 (2023): 439. http://dx.doi.org/10.3390/toxics11050439.

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This study examined the ability of the green microalgae Chlorella vulgaris to remove arsenic from aqueous solutions. A series of studies was conducted to determine the optimal conditions for biological arsenic elimination, including biomass amount, incubation time, initial arsenic level, and pH values. At 76 min, pH 6, 50 mgL−1 metal concentration, and 1 gL−1 bio-adsorbent dosage, the maximum removal of arsenic from an aqueous solution was 93%. The uptake of As (III) ions by C. vulgaris reached an equilibrium at 76 min of bio-adsorption. The maximum adsorptive rate of arsenic (III) by C. vulga

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Ilic, Irena, Natasa Jovic-Jovicic, Predrag Bankovic, et al. "Adsorption of nicotine from aqueous solutions on montmorillonite and acid-modified montmorillonite." Science of Sintering 51, no. 1 (2019): 93–100. http://dx.doi.org/10.2298/sos1901093i.

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Montmorillonite (Mt) and acid modified montmorillonite (MtA) were tested as nicotine adsorbents. The samples were characterized using FT-IR spectroscopy and low temperature nitrogen physisorption. Nicotine adsorption was performed with respect to contact time, pH and initial nicotine concentration. The kinetics of adsorption obeyed the pseudo-second-order kinetics. The optimal pH values for nicotine adsorption were 6 and 9 for Mt and MtA, respectively. The isotherms related to adsorption on Mt at pH = 6 and 9 as well as for MtA at pH=6 were best fitted with Sips isotherm model, while adsorptio

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Nayak, Bhagyashree, Bidut Prava Mohanty, M. R. Mahananda, and Samikshya Mishra. "Bioadsorption potency of Albizia ferruginea in the removal of fluoride from contaminated water." Research Journal of Chemistry and Environment 27, no. 8 (2023): 55–65. http://dx.doi.org/10.25303/2708rjce055065.

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Due to the high toxicity of fluoride to humanity, it is imperative to treat fluoride-contaminatked water for human consumption. The most commonly used method for the defluoridation of water is bio-adsorption. The present study has investigated the ability of Albizia ferruginea to remove fluoride from water through adsorption. This experiment was undertaken in batch mode. The adsorption process was systematically studied regarding the influence of pH, interaction time, temperature, adsorbent loading, fluoride ion concentration and the effect of coexisting anions to understand the ideal conditio

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Shen, Liya, Jing Xu, Xinru Wang, and Yuanli Liu. "Maleic Anhydride-Modified Water Hyacinth for Adsorption of Methylene Blue and Methyl Violet." Processes 12, no. 10 (2024): 2290. http://dx.doi.org/10.3390/pr12102290.

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Removal of toxic pollutants is of the greatest concerns facing wastewater treatment. In this study, a chemical modification method was used to prepare the maleic anhydride-modified water hyacinth (MA-EC) for the removal of methylene blue (MB) and methyl violet (MV) from water. The maleic anhydride-modified water hyacinth biosorbent was characterized and adsorption experiments were conducted. The prepared MA-EC demonstrated considerable adsorptive efficiency toward MV and MB. It was confirmed that the maximum adsorptive capacities were 1373.58 and 434.70 mg/g for MV and MB, respectively. The ad

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Vasudevan, S., and J. Lakshmi. "Studies relating to an electrochemically assisted coagulation for the removal of chromium from water using zinc anode." Water Supply 11, no. 2 (2011): 142–50. http://dx.doi.org/10.2166/ws.2011.032.

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In this work, an electrochemically assisted coagulation for the removal of chromium from water has been studied using zinc as anode and galvanized iron as cathode. The effects of pH, current density, concentration of chromium, temperature, adsorption kinetics and isotherms on the removal of chromium were investigated. The results showed that the optimum removal efficiency of 96.5% was achieved at a current density of 0.2 A/dm2, at a pH of 7.0. First- and second-order rate equations, Elovich and intraparticle diffusion models were applied to study adsorption kinetics. The adsorption process fol

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Hamid, Norasiha, Mimi Sakinah Abdul Munaim, and Mazrul Nizam Abu Seman. "Regression Analysis for the Adsorption Isotherms of Betacyanin Extracts from the Dragon Fruit Peel onto the Spun Silk Yarn." International Journal of Engineering Technology and Sciences 3, no. 2 (2016): 44–53. http://dx.doi.org/10.15282/ijets.6.2016.1.7.1057.

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The betacyanin pigment extracted from the dragon fruit peel has a potential to be a natural dye as an alternative to replace the synthetic dyes. To investigate the dyeability of spun silk with betacyanin pigment, the adsorption isotherm models were performed. The equilibrium adsorption data were analyzed using the Langmuir, Freundlich, and Temkin isotherm models. In order to determine the best-fit isotherm for each system, three error analysis methods were used to evaluate the data, namely the sum of the squares of the errors, residual root mean square error and chi-square test. On the basis o

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Cao, Chun Yan, Yong Hua Zhao, and Yan Jun Zhou. "Study on the Adsorption of Copper Ions by Bentonite." Advanced Materials Research 311-313 (August 2011): 1614–17. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1614.

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Bentonite was used as an adsorbent for removing copper ions from aqueous solutions，and the kinetic experiments and isothermal were performed. The results showed that the bentonite on Cu2+adsorption followed the pseudo-secondary kinetic model, the high temperature was benefit for adsorption; The isothermal experimental data were fitted using Freundlich and Langmuir adsorption isotherm.

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Jung, Y., Jei Won Yeon, and Yeong Keong Ha. "Preparation and Cu(II) Complexation Characteristics of Carboxymethylated Polyethyleneimine (CM-PEI) / Microporous Activated Carbon Composite." Solid State Phenomena 119 (January 2007): 303–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.119.303.

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We present the preparation and Cu(II) adsorption characteristics of a new and innovative composite which was composed of a carboxymethylated polyethyleneimine (CM-PEI) and an activated carbon with a nanopore less than 2 nm in diameter. In this study, we examined the adsorption phenomena of Cu(II) on the CM-PEI/F400 composite and evaluated the adsorption data using three kinds of isotherm models (Langmuir, Freundlich, and Temkin isotherms). It was found that the adsorption of Cu(II) on the CM-PEI/F400 composite obeys the Langmuir isotherm model. Furthermore, The Cu element mapping results showe

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Choi, Jung-Weon, and Sang-June Choi. "Polyacrylamide Functionalized Graphene Oxide/Alginate Beads for Removing Ciprofloxacin Antibiotics." Toxics 10, no. 2 (2022): 77. http://dx.doi.org/10.3390/toxics10020077.

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Ciprofloxacin (CPX), a widely used antibiotic, was removed by synthesizing graphene oxide/calcium alginate–polyacrylamide (GO/Ca-Alg2–PAM) beads, a three-dimensional double-network complex. The synthesis of GO/Ca-Alg2–PAM beads was performed by crosslinking and cation exchange mechanisms with graphene oxide (GO), sodium alginate (Na-Alg), and polyacrylamide (PAM). The properties of GO/Ca-Alg2–PAM beads were confirmed using field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and a thermogravimetric analysis. Furthermore, isothermal adsorption experiments were p

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Assoumani, A., L. Favier-Teodorescu, and D. Wolbert. "Adsorption kinetics and isotherm characteristics of selected endocrine disrupting compounds on activated carbon in natural waters." Water Supply 9, no. 1 (2009): 51–58. http://dx.doi.org/10.2166/ws.2009.063.

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Bisphenol A (BPA) and ethynylestradiol (EE2), two representative endocrine disrupting compounds (EDCs), were tested for their adsorbabilities onto two powdered activated carbons (PACs). The main aim of the study was to create a prediction tool for the determination of the EDCs adsorbabilities at low ng.L−1 level. Single solute solution adsorption isotherms at high concentrations, for prediction purposes, and low concentrations, for verification of the prediction, were performed for one EDC/PAC couple. Over the whole range of concentration, results showed that the Langmuir-Freundlich model bett

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Prasetyo, T. B., A. Maulana, M. Harianti, et al. "Adsorption isotherm model of Hg²⁺ with biochar from young coconut waste." IOP Conference Series: Earth and Environmental Science 1297, no. 1 (2024): 012093. http://dx.doi.org/10.1088/1755-1315/1297/1/012093.

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Abstract Biochar is a carbon-rich byproduct of biomass pyrolysis that may be used to restrict Hg mobility in soil by utilizing amelioration technology. This study examines the ability of biochar from young coconut waste to adsorb Hg in solution. Isothermal adsorption of Hg by batch equilibrium method. The basic principle of Hg adsorption behavior with biochar from young coconut waste (B-YCW) processed through the Kon-Tiki method at a temperature of 682 0C, moisture of 81.27%, and a yield ratio of 20.87% at a size of 0.5 mm. The adsorption of Hg2+ on B-YCW increased with increasing Hg concentra

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Mwevura, Haji, Peter Nkedi-Kizza, Michael Kishimba, and Henrik Kylin. "Adsorption-desorption of chlorpyrifos in soils and sediments from the Rufiji Delta, Tanzania." Western Indian Ocean Journal of Marine Science 19, no. 1 (2020): 77–97. http://dx.doi.org/10.4314/wiojms.v19i1.7.

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Batch adsorption-desorption equilibrium techniques were used to investigate the adsorption capacity and influence of salinity on partitioning of the insecticide chlorpyrifos between water and soil or water and sediments from the Rufiji Delta. The data were fitted to different adsorption-desorption models and the hysteresis index was calculated using the ratio between the Freundlich exponents for desorption and adsorption, and secondly, the difference in area under the normalized adsorption and desorption isotherms using the maximum adsorbed and solution concentrations. The data showed non-line

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