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      Modelling and Interpretation of Adsorption Isotherms

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      Publication date Created:
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      Journal: Journal of Chemistry
      Publisher: Hindawi Limited

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          Abstract

          The need to design low-cost adsorbents for the detoxification of industrial effluents has been a growing concern for most environmental researchers. So modelling of experimental data from adsorption processes is a very important means of predicting the mechanisms of various adsorption systems. Therefore, this paper presents an overall review of the applications of adsorption isotherms, the use of linear regression analysis, nonlinear regression analysis, and error functions for optimum adsorption data analysis.

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          Pore and solid diffusion models for fixed-bed adsorbers

          Ranjit Chakravorti, Thomas W. Weber (1974)
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            Kinetics and thermodynamics of cadmium ion removal by adsorption onto nano zerovalent iron particles.

            Meera Joseph, Ravneet Boparai, D O'Carroll (2011)
            Nano zerovalent iron (nZVI) is an effective adsorbent for removing various organic and inorganic contaminants. In this study, nZVI particles were used to investigate the removal of Cd(2+) in the concentration range of 25-450 mg L(-1). The effect of temperature on kinetics and equilibrium of cadmium sorption on nZVI particles was thoroughly examined. Consistent with an endothermic reaction, an increase in the temperature resulted in increasing cadmium adsorption rate. The adsorption kinetics well fitted using a pseudo second-order kinetic model. The calculated activation energy for adsorption was 54.8 kJ mol(-1), indicating the adsorption process to be chemisorption. The intraparticle diffusion model described that the intraparticle diffusion was not the only rate-limiting step. The adsorption isotherm data could be well described by the Langmuir as well as Temkin equations. The maximum adsorption capacity of nZVI for Cd(2+) was found to be 769.2 mg g(-1) at 297 K. Thermodynamic parameters (i.e., change in the free energy (ΔG(o)), the enthalpy (ΔH(o)), and the entropy (ΔS(o))) were also evaluated. The overall adsorption process was endothermic and spontaneous in nature. EDX analysis indicated the presence of cadmium ions on the nZVI surface. These results suggest that nZVI could be employed as an efficient adsorbent for the removal of cadmium from contaminated water sources. Copyright © 2010 Elsevier B.V. All rights reserved.
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              Second-order kinetic model for the sorption of cadmium onto tree fern: a comparison of linear and non-linear methods.

              Yuh-Shan Ho (2005)
              A comparison was made of the linear least-squares method and a trial-and-error non-linear method of the widely used pseudo-second-order kinetic model for the sorption of cadmium onto ground-up tree fern. Four pseudo-second-order kinetic linear equations are discussed. Kinetic parameters obtained from the four kinetic linear equations using the linear method differed but they were the same when using the non-linear method. A type 1 pseudo-second-order linear kinetic model has the highest coefficient of determination. Results show that the non-linear method may be a better way to obtain the desired parameters.
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                Author and article information

                Journal
                Title: Journal of Chemistry
                Abbreviated Title: Journal of Chemistry
                Publisher: Hindawi Limited
                ISSN (Print): 2090-9063
                ISSN (Electronic): 2090-9071
                Publication date Created: 2017
                Publication date (Print): 2017
                Volume: 2017
                Issue:
                Pages: 1-11
                Article
                DOI: 10.1155/2017/3039817
                SO-VID: 41236621-8521-4492-becc-ae1cecd3b46b
                Copyright © © 2017
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                http://creativecommons.org/licenses/by/4.0/

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