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Journal articles on the topic 'Langmuir adsorption model'

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Published: 24 April 2022

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1

Zou, Jie, and Reza Rezaee. "A Prediction Model for Methane Adsorption Capacity in Shale Gas Reservoirs." Energies 12, no. 2 (2019): 280. http://dx.doi.org/10.3390/en12020280.

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Estimation of methane adsorption capacity is crucial for the characterization of shale gas reservoirs. The methane adsorption capacity in shales is measured using high-pressure methane adsorption to obtain the adsorption isotherms, which can be fitted by Langmuir model. The determined Langmuir parameters can provide the methane adsorption capacity under actual reservoir conditions. In this study, a prediction model for the methane adsorption in shales was constructed based on 66 samples from 6 basins in China and Western Australia. The model was established in four steps: a model of Langmuir v
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Choi, Jiyeon, Ardie Septian, and Won Sik Shin. "Influence of Salinity on the Removal of Ni and Zn by Phosphate-Intercalated Nano Montmorillonite (PINM)." Minerals 10, no. 11 (2020): 980. http://dx.doi.org/10.3390/min10110980.

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The salinity influence on the adsorptions of Ni and Zn onto phosphate-intercalated nano montmorillonite (PINM) were investigated. Single adsorption isotherm models fitted the single adsorption data well. The adsorption capacity of Ni was higher than that of Zn onto PINM at different salinities. The single adsorption parameters from Langmuir model (QmL and bL) were compared with the binary adsorption (QmL* and bL*). The QmL* of Zn was lower than that of Ni. The simultaneous presence of Ni and Zn decreased the adsorption capacities. The single and binary adsorptions onto PINM were affected by th
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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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Jiang, Wen Ping, and Qun Zhang. "Simplified De Bore Model of Coal Adsorption Gas." Advanced Materials Research 838-841 (November 2013): 1847–51. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.1847.

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With respect to the problems existed in the description of the adsorption characteristics of super-low rank and super-high rank coals using the conventional Langmuir adsorption model, in this paper, We first introduces the De Bore adsorption model into the coal seam gas adsorption, and utilizes the results of the ab initio calculation of quantum chemistry result and the isothermal adsorption test statistical results, simplifies the De Bore model equation. The new adsorption model is more suitable for describing the gas adsorption characteristics of the whole coal ranks. This new model has the
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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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Savcı, Serpil, and Fatma Karadağ. "FAST ADSORPTION OF METHYLENE BLUE BY FILTER COFFEE WASTE." e-Journal of New World Sciences Academy 15, no. 4 (2020): 111–20. http://dx.doi.org/10.12739/nwsa.2020.15.4.5a0138.

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In this study, removal of a cationic dye methylene blue by filter coffee grounds as a potential waste was investigated. Systematically, the effect of initial dye concentration, pH and contact time on the adsorption efficiency were determined. Isotherm and kinetic models were studied. Langmuir and Freundlich model were calculated for adsorption of methylene blue. Langmuir model is better fit than Freundlich model (R2=0.9892). The maximum adsorption capacity of filter coffee waste were 312.515 mg/g. Scanning electron microscope (SEM) images were used to record the surface characteristics and mor
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Mills, Andrew, and Christopher O’Rourke. "Revised Disrupted Langmuir–Adsorption Model of Photocatalysis." Journal of Physical Chemistry C 119, no. 34 (2015): 19941–46. http://dx.doi.org/10.1021/acs.jpcc.5b05787.

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8

Jordão, Cláudio Pereira, César Reis, Carlos Roberto Bellato, Gulab Newandram Jham, and José Luis Pereira. "Adsorption of Cu2+ ions on humic acids." Rem: Revista Escola de Minas 54, no. 2 (2001): 109–14. http://dx.doi.org/10.1590/s0370-44672001000200006.

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Commercial samples of humic acids (Fluka AG) were used to evaluate the adsorption behaviour of Cu2+ ions. The mathematical model described by Langmuir's adsorption equation was applied and the values of the maximum adsorption capacity b and those of the constant related to the bonding energy a were obtained. Aliquots of copper nitrate solutions with different copper concentrations were added to the humic acid suspensions at constant pH values (4.0 and 5.0). The Langmuir isotherms presented two distinct adsorption regions, showing that the adsorptive phenomenon occurs in two distinct steps acco
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Elkartehi, Moftah Essa, Rehab Mahmoud, Nabila Shehata, Ahmed Farghali, Shimaa Gamil, and Amal Zaher. "LDH Nanocubes Synthesized with Zeolite Templates and Their High Performance as Adsorbents." Nanomaterials 11, no. 12 (2021): 3315. http://dx.doi.org/10.3390/nano11123315.

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In this work, the efficiency of the adsorptive removal of the organic cationic dye methylene blue (MB) from polluted water was examined using three materials: natural clay (zeolite), Zn-Fe layered double hydroxide (LDH), and zeolite/LDH composite. These materials were characterized via X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray (EDX) diffraction (XRF), low-temperature N2 adsorption, pore volume and average pore size distribution and field emission scanning electron microscopy (FE-SEM
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10

Feng, Quan Li, Yu Jia, Jian Chuan Yu, Ling Yang, and Ping Ning. "Analytical Heterogeneous Extended Langmuir Model: Effect of Unilan Parameters." Advanced Materials Research 581-582 (October 2012): 41–45. http://dx.doi.org/10.4028/www.scientific.net/amr.581-582.41.

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Analytical Heterogeneous Extended Langmuir (AHEL) model is explicit and computationally simple for predicting gas mixture adsorption based on parameters of pure component isotherm. An example of ethane and ethylene adsorption on molecular sieve revels that the prediction of gas mixture adsorption is related to the parameters of the maximum adsorption energies for different pure gas. The parameters are not required to be the same. But their significant difference generates big deviation in prediction of mixed gas adsorption for the system studied in this work., even though they agree well with
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11

Huang, Ruihua, Qian Liu, Lujie Zhang, and Bingchao Yang. "Utilization of cross-linked chitosan/bentonite composite in the removal of methyl orange from aqueous solution." Water Science and Technology 71, no. 2 (2014): 174–82. http://dx.doi.org/10.2166/wst.2014.478.

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A kind of biocomposite was prepared by the intercalation of chitosan in bentonite and the cross-linking reaction of chitosan with glutaraldehyde, which was referred to as cross-linked chitosan/bentonite (CCS/BT) composite. Adsorptive removal of methyl orange (MO) from aqueous solutions was investigated by batch method. The adsorption of MO onto CCS/BT composite was affected by the ratio of chitosan to BT and contact time. pH value had only a minor impact on MO adsorption in a wide pH range. Adsorption kinetics was mainly controlled by the pseudo-second-order kinetic model. The adsorption of MO
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Dülger, Öznur, Fatma Turak, Kadir Turhan, and Mahmure Özgür. "Sumac Leaves as a Novel Low-Cost Adsorbent for Removal of Basic Dye from Aqueous Solution." ISRN Analytical Chemistry 2013 (November 24, 2013): 1–9. http://dx.doi.org/10.1155/2013/210470.

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Sumac Leaves (SL) (Rhus Coriaria L. ) were investigated as an inexpensive and effective adsorbent for the adsorption of methylene blue (MB) from aqueous solution. The effects of initial dye concentration, initial solution pH, phases contact time, and adsorbent dose on the adsorption of MB on SL were investigated. The amount of dye adsorbed was found to vary with initial solution pH, Sumac Leaves dose, MB concentration, and phases contact time. The Langmuir and Freundlich adsorption models were evaluated using the experimental data and the experimental results showed that the Langmuir model fit
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13

Salih, Shameran J., Sewgil S. Anwer, and Rezhna H. Faraj. "A Biosorption of Mercury from Wastewater Using Isolated Aspergillus Sp. Modified 1,10-Phenanthroline: Hill Isotherm Model." Science Journal of University of Zakho 5, no. 4 (2017): 288. http://dx.doi.org/10.25271/2017.5.4.379.

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Equilibrium biosorption of mercury (II) onto new developed biosorbent (1,10-phenanthroline-graft- cell/Filamentous fungi) in both free, immobilized and dead cell were investigated. The product was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). In this work several isotherm models applied to predict the process design for the adsorption system. Hill, Sips, Langmuir and Freundlich utilized to determine the adsorption parameters, the equilibrium data fitted well to Hill and Sips isotherm models followed by Langmuir. Meanwhile, the maximum a
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14

Bozgeyik, Kadriye, and Turkan Kopac. "Synthesis of Multi-Walled Carbon Nanotube-Zirconia Composite and Bovine Serum Albumin Adsorption Characteristics." Materials Science Forum 900 (July 2017): 27–31. http://dx.doi.org/10.4028/www.scientific.net/msf.900.27.

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Multi-walled carbon nanotube-zirconia composite (MWNT-ZrO2) was synthesized by a simple in situ chemical precipitation method. Adsorption of bovine serum albumin (BSA) from aqueous solution on the MWNT-ZrO2 composite was studied using batch technique at different pH and temperatures. The adsorption equilibrium and kinetic data were analzed using different models. The adsorption isotherm data could be described by both of the Langmuir and Freundlich adsorption models. Adsorption kinetics followed the pseudo-first-order rate model. MWNT loading improved the surface and the BSA adsorptive charact
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15

El-Geundi, Mohammad S., and Assanousi A. Abufares. "Adsorption Isotherm of an Insecticide Methomyl onto Natural Clay." Al-Mukhtar Journal of Sciences 28, no. 1 (2022): 46–59. http://dx.doi.org/10.54172/mjsc.v28i1.144.

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Adsorption isotherm of an insecticide methomyl onto natural clay has been investigated. The experimental data were fitted to isotherm models, Langmuir, Freundlich and Redlich Peterson. The Langmuir model fit the experimental data significantly better than Freundlich and Redlich Peterson models. A dimensionless separation factor, Ř, was used to judge the favorable adsorption. A chart based on material balance using single batch adsorber was constructed for different percentage of methomyl removal using the Langmuir model where the mass of natural clay required to treat a specified volume of sol
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16

Han, Feng, Wen Hong Li, Xuan Tang, and Dong Li. "Absorption Equilibrium and Thermodynamics of Fenugreek Yellow Pigment on Macroporous Resins." Advanced Materials Research 233-235 (May 2011): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.91.

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The adsorption equilibrium and thermodynamics of pigment extracted from Fenugreek after degumming on macroporous resins was investigated under differentinitial concentrations. The suitability of the Freundlich and Langmuir adsorption models to the equilibrium data was investigated. The model fitness was determined by R2 . Thermodynamic parameters were calculated by the Van’t Hof equation.The results showed that Freundlich model gave a better fit of adsorption isotherms than Langmuir models. The positive value of enthalpy(∆H) indicated that the adsorption was endothermic, the negative value of
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17

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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Elhussien, Mutasim H., and Isa Yusuf Makarfi. "Acetic acid adsorption onto activated carbon derived from pods of Acacia nilotica var astringens (Sunt tree) by chemical activation with ZnCl2." Journal of Natural Sciences Research 5, no. 10 (2015): 42–48. http://dx.doi.org/10.51415/10321/3022.

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The purpose of this study is to prepare and investigate the adsorption behavior of acetic acid onto two samples of activated carbon prepared from Acacia nilotica var astringens, Sunt tree,( SUNT-C1 and SUNT-C2). Applicability Langmuir, Freundlich, Temkin and Dubinin-Radushkevitch models of adsorptions isotherm have been tested, while acetic acid initial concentration varied between (0.010 – 0.300) mol/dm3. A comparative study of adsorption capacities of these samples was performed. The obtained data were compared and fitted well with the four models; there exist a correlation between physico-
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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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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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Zainal, Nur Aqilah, Shariff Ibrahim, and Borhannuddin Arifin. "Preparation and Application of Zinc Chloride-Modified Cocoa (Theobroma cacao) Pod Husk-Based Carbon for the Removal of Acid Dyes." Materials Science Forum 889 (March 2017): 221–25. http://dx.doi.org/10.4028/www.scientific.net/msf.889.221.

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Cocoa pod husk, an agricultural waste was chemically modified using Zinc Chloride (ZnCl2) and used as an adsorbent for removal of acid dyes; (i) Acid Violet 17 (AV17) and (ii) Acid Yellow 36 (AY36) from aqueous solution. The raw (CPHC) and chemically modified cocoa pod husk carbon (ZCPHC) were characterized by Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-ray (EDX). The adsorption was performed on removing AV17 and AY36 from aqueous solution in batch adsorption system. The experimental data was simulated using Langmuir and Freundlich isotherm models. The isotherm
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Belgacem, Balsam, Mohamed Chlendi, and Mohamed Bagane. "Modeling the Adsorption Step during Hydrogen Purification in Gas Treatment Application." International Journal of Chemical Reactor Engineering 12, no. 2 (2014): 705–16. http://dx.doi.org/10.1515/ijcre-2014-0055.

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Abstract The present work is interested in modeling the adsorption step for the process of Pressure Swing Adsorption (PSA) for hydrogen purification. This work aims at modeling the adsorption of one or more compounds in a mixture at different pressures ranging from 8 to 20 bars at ambient temperature. The flow was presented by the piston model with an axial dispersion. The equilibrium isotherm was expressed by the Langmuir model for the mono-component adsorption and the model of Langmuir extended for the multi-component adsorption. Moreover, two models of kinetic transfer between the gaseous a
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LIU, GUANNAN, BOMING YU, FENG GAO, DAYU YE, and FENGTIAN YUE. "ANALYSIS OF PERMEABILITY EVOLUTION CHARACTERISTICS BASED ON DUAL FRACTAL COUPLING MODEL FOR COAL SEAM." Fractals 28, no. 07 (2020): 2050133. http://dx.doi.org/10.1142/s0218348x20501339.

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In study of gas migration process in coal seam, the permeability evolution rule with time has been one of hot topics in the area of coal seam for decades. At present, in view of the time-varying rule of coal seam permeability, the influence of microstructure parameters and adsorption effect are seldom considered simultaneously. In this paper, the fractal seepage model coupled with coal deformation, and the adsorption expansion effect of coal is proposed. A multi-field coupling model is established by considering the influence of matrix and fracture structure. The influence of structural parame
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Santos, V. C. G. Dos, C. R. T. Tarley, J. Caetano, and D. C. Dragunski. "Assessment of chemically modified sugarcane bagasse for lead adsorption from aqueous medium." Water Science and Technology 62, no. 2 (2010): 457–65. http://dx.doi.org/10.2166/wst.2010.291.

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This study evaluated the adsorption capacity of chemically modified sugarcane bagasse with citric acid (B-CA), sodium hydroxide (B-S) and citric acid and sodium hydroxide (B-CAS) for Pb2 + ion adsorption in aqueous medium. Infrared spectroscopy (FT-IR) was used to characterise the materials, where the chemical modification was confirmed by the presence of carboxylate groups created at 1,730 cm−1 peak. All assays related to Pb2 + ion adsorption onto adsorbent, i.e. equilibrium time between Pb2 + ions and adsorbate (24 h), as well as Pb2 + ion concentration, were performed in batch system. The i
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Hasani, Naim, Teuta Selimi, Altin Mele, et al. "Theoretical, Equilibrium, Kinetics and Thermodynamic Investigations of Methylene Blue Adsorption onto Lignite Coal." Molecules 27, no. 6 (2022): 1856. http://dx.doi.org/10.3390/molecules27061856.

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The interaction of methylene blue (MB) dye with natural coal (collected from coal landfills of the Kosovo Energy Corporation) in aqueous solutions was studied using adsorption, kinetics, and thermodynamic data, and Monte Carlo (MC) calculations. In a batch procedure, the effects of contact duration, initial MB concentration, pH, and solution temperature on the adsorption process were examined. The Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D–R) isotherms were used to examine the equilibrium adsorption data. The equilibrium data fit well to the Freundlich and Langmuir adsorption is
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Bai, Runsheng, Jingguang Deng, and Ralph T. Yang. "Improved Multisite Langmuir Model for Mixture Adsorption Using Multiregion Adsorption Theory." Langmuir 19, no. 7 (2003): 2776–81. http://dx.doi.org/10.1021/la020838v.

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Wahyuni, Nelly, Imelda H. Silalahi, and Dina Angelina. "ISOTERM ADSORPSI FENOL OLEH LEMPUNG ALAM." Jurnal Teknologi Lingkungan Lahan Basah 7, no. 1 (2019): 029. http://dx.doi.org/10.26418/jtllb.v7i1.34363.

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Abstrak Fenol merupakan polutan yang sangat berbahaya di lingkungan karena bersifat racun dan sulit terdegradasi oleh organisme pengurai. Lempung alam yang berasal dari Kecamatan Capkala, Kabupaten Bengkayang akan dikaji penggunaannya sebagai adsorben fenol. Adsorpsi dilakukan dengan metoda batch pada variasi waktu kontal dan konsentrasi awal fenol. Data kesetimbangan adsorpsi diuji dengan isoterm Langmuir dan Freundlich. Hasil penelitian menunjukkan waktu kontak optimum adsorpsi adalah 4 jam. Proses adsorpsi fenol oleh lempung alam mengikuti model isoterm adsorpsi Langmuir dengan kapasitas ad
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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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Liu, Xiao, Mei Yang, and Yong Yang. "Adsorption Characteristic of Steel Slag Haydite for Phosphorus Removal from Wastewater." Advanced Materials Research 690-693 (May 2013): 1033–36. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1033.

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Slag haydite made from steel slag and clay was used for phosphate adsorption, and adsorption characteristic was studied. Results showed that the uptake of phosphate was facilitated for pH 3-8, the adsorption process fitted with pseudo-second-order model and intra-particle diffusion model, and the equilibrium time was about 3h. Isotherm adsorption data on slag haydite were fitted by both the Freundlich and Langmuir models. It was found that the data follows the Langmuir model better, and the maximum adsorption capacity increased from 1.17mg·g-1 to 2.42mg·g-1 as temperature rose from 20°C to 40°
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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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Jamaliniya, Sara, O. D. Basu, Saumya Suresh, Eustina Musvoto, and Alexis Mackintosh. "Kinetic analysis of sucrose activated carbon for nutrient removal in water." H2Open Journal 3, no. 1 (2020): 208–20. http://dx.doi.org/10.2166/h2oj.2020.012.

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Abstract A renewable, green activated carbon made from sucrose (sugar) was compared with traditional bituminous coal-based granular activated carbon (GAC). Single and multi-component competitive adsorption of nitrate and phosphate from water was investigated. Langmuir and Freundlich isotherm models were fitted to data obtained from the nitrate and phosphate adsorption experiments. Nitrate adsorption fits closely to either Freundlich or Langmuir model for sucrose activated carbon (SAC) and GAC with a Langmuir adsorption capacity of 7.98 and 6.38 mg/g, respectively. However, phosphate adsorption
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32

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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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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He, Da Song, Cun Ping Liu, Yong Fu Yuan, and Xiu Ying Li. "Study on the Adsorption of Trichloroethylene in Water on Activated Carbon and Activated Carbon Fibers." Advanced Materials Research 113-116 (June 2010): 1021–24. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.1021.

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The removal of trichloroethylene (TCE) from water using activated carbon fibers (ACF) and activated carbon (AC) was investigated. Adsorption, as an efficient process to remove TCE from water was chosen; in particular with ACF and AC as adsorbents. The results showed that physisorption play important roles for adsorption of TCE onto activated carbon fibers, while the less important chemisorption. Langmuir and Freundlich models were then employed to correlate the equilibria data. The Langmuir model best described the AC adsorption isotherm of TCE, with R2 0.9942. Freundlich model best fitted the
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35

Khan, Taimur, Mohamed Hasnain Isa, Malay Chaudhuri, Raza Ul Mustafa Muhammad, and Mohamed Osman Saeed. "Determination of Adsorption Capacity of Agricultural-Based Carbon for Ni (II) Adsorption from Aqueous Solution." Applied Mechanics and Materials 567 (June 2014): 20–25. http://dx.doi.org/10.4028/www.scientific.net/amm.567.20.

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The aim of the study was to prepare potentially cheaper carbon for the adsorptive removal of Nickle [Ni (II)] from aqueous solution. The adsorption capacity of the prepared carbon to remove Ni (II) from aqueous solution was determined and adsorption mechanism was investigated. Rice husk carbon was prepared by incineration in a muffle furnace. The incinerated rice husk carbon (IRHC) was characterised in terms of surface area, micropore area, micropore volume, average pore diameter and surface morphology. Adsorption of Ni (II) by IRHC was examined. The influence of operating parameters, namely,
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36

Peng, Zhigao, Shenggui Liu, Songlei Tang, Yuechao Zhao, and Yingjun Li. "Multicomponent Lattice Boltzmann Simulations of Gas Transport in a Coal Reservoir with Dynamic Adsorption." Geofluids 2018 (July 12, 2018): 1–13. http://dx.doi.org/10.1155/2018/5169010.

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Gas adsorption occurs when the dynamic adsorption equilibrium conditions of the local adsorptive sites are broken. In the overall process of unconventional natural gas generation, enrichment, storage, and production, this phenomenon plays a significant role. A double-distribution Lattice Boltzmann model for solving the coupled generalized Navier-Stokes equation and advection-diffusion equation with respect to the gas-solid dynamic adsorption process is proposed for multicomponent gas migration in the unconventional reservoir. The effective diffusion coefficient is introduced to the model of ga
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Dong, Xiao Ping, Jie Fu, Jun Hao Jin, and Chen Chen. "Adsorption of Basic Dye in Aqueous Solution by Mesoporous Carbon Materials." Advanced Materials Research 441 (January 2012): 559–63. http://dx.doi.org/10.4028/www.scientific.net/amr.441.559.

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Mesoporous carbon CMK-3 with high surface area and opened pore structure was used to adsorb the basic dye, Malachite green (MG). The equilibrium adsorption data was well described by the Langmuir model, and a very high Langmuir adsorption capacity was obtained by this adsorbent. The adsorption kinetics was found to be best represented by a pseudo-second-order kinetic model.
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38

Boyko, I., M. Petryk, M. Shynkaryk, and O. Petryk. "NONLINEAR MODEL OF THE THREE-COMPONENTS COMPETITIVE ADSORPTION USING LANGMUIR EQUILIBRIUM." Bukovinian Mathematical Journal 9, no. 1 (2021): 64–78. http://dx.doi.org/10.31861/bmj2021.01.06.

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A basis for the mathematical modeling of non-isothermal gas competitive adsorption in a porous solid using Langmuir equilibrium is given. High-performance analytical solutions of considered adsorption models based on the Heaviside operating method and Landau’s decom- position and linearization approach of Langmuir equilibrium by expanding into a convergent series in the temperature phase transition point are proposed. Numerical experiments results based on high-speed computations on multicore computers are presented.
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Wang, Chun Xiao, Xiao Ling Shao, and Xiang Yang Wu. "Sorption of Phthalate Esters on Surficial Sediment of the Yangtze River, China." Advanced Materials Research 1073-1076 (December 2014): 263–67. http://dx.doi.org/10.4028/www.scientific.net/amr.1073-1076.263.

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The sorption of three kinds of phthalic acid esters (PAEs) in the Yangtze River sediment was investigated in this paper. Langmuir and Freundlich model were used to fit their adsorption isotherms. Results showed that Langmuir model could better fit the adsorption isotherms of PAEs in the sediment.
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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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Bezerra, Roosevelt Delano Sousa, Mateus Soares Silva, Francisco José Lustosa Ferreira, Lucinaldo Santos Silva, Josy Anteveli Osajima, and Edson Cavalcanti Silva Filho. "Functionalization of Cellulose with Cysteamine: Synthesis, Characterization, and Adsorption." Materials Science Forum 869 (August 2016): 740–44. http://dx.doi.org/10.4028/www.scientific.net/msf.869.740.

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The cellulose matrix was chemically modified with cysteamine (CelCTA) and characterized by elemental analysis, and subsequently applied to the removal of copper ion in an aqueous media. The experimental adsorption isotherm obtained for the studied system was adjusted to linear models: Langmuir, Freundlich, and Temkin. Among the proposed models, the Langmuir model was the one with the best linear adjustment to data obtainedexperimentally, with an adsorption capacity of the adsorbent for 0.3292 mmol dm-3.
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Journal, Baghdad Science. "A study of adsorption isotherms for the removal of herbicide Atlantis WG from aqueous solutions by using Bentonite clay." Baghdad Science Journal 12, no. 1 (2015): 148–56. http://dx.doi.org/10.21123/bsj.12.1.148-156.

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The subject of this research involves studying adsorption to removal herbicide Atlantis WG from aqueous solutions by bentonite clay. The equilibrium concentration have been determined spectra photometry by using UV-Vis spectrophotometer. The experimental equilibrium sorption data were analyzed by two widely, Langmuir and Freundlish isotherm models. The Langmuir model gave a better fit than Freundlich model The adsorption amount of (Atlantis WG) increased when the temperature and pH decreased. The thermodynamic parameters like ?G, ?H, and ?S have been calculated from the effect of temperature o
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43

Nouri, S., and Fouad Haghseresht. "Adsorption of Dissociating Aromatic Compounds by Activated Carbon: Effects of Ionization on the Adsorption Capacity." Adsorption Science & Technology 20, no. 4 (2002): 417–32. http://dx.doi.org/10.1260/02636170260295588.

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The adsorption of three dissociating aromatic compounds on an untreated commercially available activated carbon was investigated systematically. All adsorption experiments were carried out in pH-controlled aqueous solutions. The experimental isotherms were analyzed using the homogeneous Langmuir model. The effects of surface heterogeneity were investigated via the theory of localized physical adsorption, using the Langmuir equation as the local isotherm equation and assuming a Gaussian adsorption energy distribution. A new method of utilizing the extracted parameters from the homogeneous and h
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44

Dao, To Uyen T., Hong Tham T. Nguyen, Do Trung Sy, et al. "Adsorption Isotherms and Kinetic Models for Congo Red Adsorption on Ca-Al Layer Double Hydroxide Adsorbent." Solid State Phenomena 298 (October 2019): 128–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.298.128.

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The equilibrium and physicochemical properties of the Ca-Al LDH material were determined in this study. Kinetic data were analyzed using isothermal models including Langmuir, Freundlich, Temkin and Dubinin–Radushkevich. Adsorption behavior is well described by the Langmuir isotherm and the pseudo-second-order model. The maximum adsorption capacity of CR on Ca-Al LDH is found to be 72.569 mg/g. The uptake results indicated that the adsorption process was controlled by chemical processes and single-layer adsorption. Due to, the Ca-Al LDH material may be become an effective adsorbent for removal
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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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46

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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47

Dinh, Van-Phuc, Ngoc-Chung Le, Thi-Phuong-Tu Nguyen та Ngoc-Tuan Nguyen. "Synthesis ofα-MnO2Nanomaterial from a Precursorγ-MnO2: Characterization and Comparative Adsorption of Pb(II) and Fe(III)". Journal of Chemistry 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/8285717.

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α-MnO2nanostructure was successfully synthesized via hydrothermal treatment of a precursorγ-MnO2. Structure, morphology, and BET surface area were characterized using X-ray powder diffraction (XRD), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller nitrogen adsorption (BET-N2adsorption). Thermal analysis result showed thatα-MnO2nanorods were formed fromγ-MnO2at 600°C. In addition, Pb(II) and Fe(III) adsorptive properties were investigated in an optimal condition. Results showed that equilibrium adsorption was obtained after 60 minutes for Pb(II) at pH = 4.0 and 80 minutes for Fe(I
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48

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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Wang, Chongxia, Qingping Song, and Jiangang Gao. "Investigation of adsorption capacity of N-carboxymethyl chitosan for Pb(II) ions." Water Science and Technology 68, no. 8 (2013): 1873–79. http://dx.doi.org/10.2166/wst.2013.438.

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N-carboxymethyl chitosan (NCMC) was prepared by reacting chitosan (CTS) with chloroacetic acid and characterized by 13C-NMR spectroscopy to confirm that carboxymethylation occurred only in the amino groups. The adsorption properties of CTS, NCMC and O-carboxymethyl chitosan (OCMC) towards Pb(II) ions were evaluated and the order of the adsorption capacity was as follows: NCMC > OCMC > CTS. The effects of initial pH value (2.0–5.5) of the solutions and contact time (5–120 min) on adsorption of Pb(II) were investigated and the kinetic data were evaluated using the pseudo-first-orde
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50

Wang, Junchao, Yongjie Wei, and Zhengfei Ma. "Modified Dual-Site Langmuir Adsorption Equilibrium Models from A GCMC Molecular Simulation." Applied Sciences 10, no. 4 (2020): 1311. http://dx.doi.org/10.3390/app10041311.

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In the modern industrial separation process, the pressure swing adsorption technology is widely used to separate and purify gases due to its low energy consumption, low cost, convenience, reliability, and environmental benignity. The basic elements of the design and application of the pressure swing adsorption process are adsorption isotherms at different temperatures for adsorbents. The dual-site Langmuir (DSL) adsorption equilibrium model is the mostly used model; however, this model is based on the assumption that the adsorption energy on the surface of an adsorbent is uniform and remains u
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