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Showing 1 to 17 of 17 for “"Isotherm models"”.
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ADSORPTION OF ANTIBIOTICS BY VERMICULITE
… techniques. The Langmuir and Freundlich isotherm models were initially used to explain the adsorption processes. The separation factor (RL) values derived from the Langmuir model and the 1/n values derived from Freundlich model in the present investigation were less than one, indicating …
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Color Removal From Pulp Mill Effluent Using Coal Ash Produced From Georgia Power Coal Combustion Plants
… determine their effect on removal. Kinetic and isotherm studies were also conducted using the optimal conditions, and the data was fitted to existing adsorption models. In addition, a column study was completed to observe CFA in a continuous flow setting. The research produced a cost-effective …
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Defluoridation of Water Using Silica Based Aluminum Coated Adsorbents
… kinetics and fit Langmuir and Freundlich isotherm models, indicating favorable adsorption. Sorbent regeneration and reuse were investigated through re-coating techniques using the original coating solutions. The re-coated AMCCS and CMCS sorbents maintained high removal performance across …
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Optimization of biosorption process using cucumis melo rind for the removal of Fe, Mn and Pb ions from groundwater
… the metal ions. The Langmuir, Freundlich and BET isotherm models were used to predict the behavior metal binding while Langergren Pseudo-first and Pseudo-second order were used to study the kinetics aspects. The equilibrium data for all metals were best fit to the Langmuir adsorption isotherm with …
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Microplastics as Contaminant Vectors: Influencing the Bioaccessibility of Naphthalene from Freshwater
… MPs was investigated through the kinetic and isotherm experiments in freshwater, and the bioaccessible fraction of naphthalene in the gastric and intestinal digestive phases was measured using a modified physiologically based extraction test (PBET). The effects of aging of MPs on the sorption …
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Investigating Bisulfide Sorption onto Bentonite through Laboratory Experiments and Numerical Modelling
… ionic strength. Several established kinetic and isotherm models were applied to the experimental data to provide insight into HS- sorption dynamics onto bentonite. In addition, desorption test results indicated that HS- was irreversibly sorbed on bentonite. Surface analyses conducted using …
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Bacterial poly-gamma-Glutamic Acid (y-PGA) - a promising biosorbent of heavy metals
… compared to that (59.48%) sorbed by LMW γ-PGA. Isotherm models showed that the Redlich-Peterson best described the metal adsorption capacity of γ-PGA. It was also found that a multisite adsorption mechanism occurred via the complexation of metal ions with the free α-carboxyl and possibly the …
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Natural biosorbents for the removal of metals from aqueous solutions
… Freundlich and Redlich-Peterson adsorption isotherm models. The best fits were obtained for the Langmuir model with 416.7, 86.2, 30.5 and 14.6 mg/g MMC for Pb(II), Cu(II), Zn(II) and Hg(II) respectively. The results show that biosorption of metals is complex and proceeds via adsorption, …
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Adsorption of Iodine and Water on Silver-Exchanged Mordenite
… -flow experiments and data analyses by kinetic models. Mass transfer, diffusion and reaction processes involved in the adsorption process were evaluated.</p> <p>In addition, one issue that has to be addressed when using Ag0Z for iodine removal is the potential co-adsorption of other gas species, …
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Fabrication of Biomass-Polymeric Adsorbent for the Removal of Selected Metal Species, Nutrients and Pathogens in Aqueous Solutions
… diffusions. Freundlich and Langmuir adsorption isotherm models proved to be responsible for the sorption of Cr6+, Cd2+, and PO43- ions by the different adsorbents. The thermodynamic data revealed that the adsorption process was spontaneous and feasible in all the adsorbents across all …
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Sorption of Cadmium, Copper, Lead, and Zinc as influenced by pH, ionic strength and selected soil components
Metals sorption in soils is influenced by several factors, including pH, ionic strength, the presence of ionic composition or organic ligands, total amount of metals, and adsorbent loading. These conditions should be considered when evaluating metal sorption capacity of soil material or when …
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Functional Characterization of Green Sorption Media and Scaling of Pilot Studies for Copper Removal in Stormwater Runoff
… individual media components including studies of isotherm, reaction kinetics, column adsorption and reaction kinetics. Batch adsorption tests revealed that the media and media mixture follow both the Freundlich and Langmuir isotherm models and that the coconut coir had the highest affinity for …
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The purification of industrial wastewater to remove heavy metals and investigation into the use of zeolite as a remediation tool
… respectively. Both the Langmuir and Freundlich isotherm models were used to characterize the experimental data and to assess the adsorption behaviour of natural zeolite for copper, iron, lead and zinc. The experimental data were slightly better suited to the Langmuir isotherm than the …
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Using agricultural wastes to treat lead-contaminated water in Western Australia
… experimental data were validated using different isotherm models developed by Langmuir, Freundlich, Harkins-Jura, Redlich- Peterson and Halsey to describe the adsorption process based on the homogeneity of the surfaces of the adsorbents. Pseudo-first-order, pseudo-second-order, intra-particle …
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Resorcinol-formaldehyde/titania (RFTi) gel composites for wastewater treatment
… interactions by applying kinetic and isotherm models to the adsorption data, and most of the samples showed a combination of physisorption and chemisorption phenomena. The effect of temperature showed that the reactions were thermodynamically feasible, and temperature-dependent …
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Experimental and Modeling the Flow Properties of Distillers Dried Grains (DDG) with Varying Soluble Levels and Moisture Contents
… improve the flowability of DDGS.<br /> EMC isotherms for DDGS at various relative humidity and temperatures are essential to optimize its storage and transportation conditions. DDGS showed a type III isotherm behavior, which is common in high sugar foods. Nine traditional isotherm models …
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Synthesis and potential application of Fe3+/Mn2+ bimetal and hexadecyltrimethylammonium bromide (HDTMA-Br) modified clayey soils for arsenic removal in groundwater
… be optimum at pH between 6 and 8. The adsorption isotherm data for As(III) and As(V) removal by both clays fitted better to Freundlich isotherm. Adsorption of both species of arsenic onto the clay mineral occurred via electrostatic attraction and ion exchange mechanisms. Both clay soils could be …