Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/63528
Title: Adsorption of arsenate from aqueous solution by ferric oxide-impregnated Dowex Marathon MSA anion exchange resin: application of non-linear isotherm modeling and thermodynamic studies
Authors: Sujitra Tandorn
Orn anong Arqueropanyo
Wimol Naksata
Ponlayuth Sooksamiti
Ingon Chaisri
Keywords: Agricultural and Biological Sciences
Earth and Planetary Sciences
Environmental Science
Issue Date: 1-Mar-2019
Abstract: © 2019, Springer-Verlag GmbH Germany, part of Springer Nature. The characteristic of adsorption of As(V) onto ferric oxide-impregnated anion resin Dowex marathon MSA (FO-Dowex) was investigated. Batch adsorption experiment was studied as a function of pH, contact time, initial As(V) concentration, and temperature. The results revealed that the adsorption of As(V) onto FO-Dowex was highly pH-dependent and that the equilibrium time was attained within 360 min. Two-parameter equations (Langmuir, Freundlich, and Temkin) and three-parameter equations (Redlich–Peterson and Sips) isotherm models were used for modeling the experimental data for As(V) adsorption onto FO-Dowex at different temperatures through the non-linear regression method. The goodness of fit of the isotherm model to the experimental data was evaluated by comparing the statistical values of the coefficient of determination (R 2 ), Chi-square (χ 2 ) and the root mean square error (RMSE). From the isotherm analysis, the equilibrium data of As(V) adsorption onto FO-Dowex were found to be in good agreement with the Redlich–Peterson, Sips, and Langmuir isotherm model, based on the higher R 2 value and the lower values of χ 2 and RMSE as compared to other isotherm models. Furthermore, the calculation of thermodynamic parameters such as Gibbs free energy change (ΔG°), enthalpy change (ΔH°), and entropy change (ΔS°) revealed that the adsorption process was feasible, spontaneous, and endothermic in nature. All the results suggested that FO-Dowex could be used an effective and potential adsorbent for the removal of As(V) from aqueous solutions.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85061922474&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/63528
ISSN: 18666299
18666280
Appears in Collections:CMUL: Journal Articles

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