Removal of AsV by FeIII-Loaded XAD7 Impregnated Resin Containing Di(2-ethylhexyl) Phosphoric Acid (DEHPA): Equilibrium, Kinetic, and Thermodynamic Modeling Studies

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• 作者：Adina Negrea ; Mihaela Ciopec ; Lavinia Lupa ; Corneliu M. Davidescu ; Adriana Popa ; Gheorghe Ilia ; Petru Negrea
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2011
• 出版时间：October 13, 2011
• 年：2011
• 卷：56
• 期：10
• 页码：3830-3838
• 全文大小：841K
• 年卷期：v.56,no.10(October 13, 2011)
• ISSN：1520-5134

文摘

In this paper, we studied the feasibility of using Fe<sup>IIIsup>-loaded Amberlite XAD7 impregnated resin containing di(2-ethylhexyl) phosphoric acid (DEHPA) as adsorbents for the removal of As<sup>Vsup> from aqueous solution. The XAD7-DEHPA resins are obtained by the dry method (DM) and column method (CM) of impregnation, respectively. Equilibrium, kinetic, and thermodynamic studies are carried out to study the adsorption performance of both types of Fe-XAD7-DEHPA resins for the removal process of As<sup>Vsup> from aqueous solution. The effects of initial As<sup>Vsup> concentration, contact time, and temperature of the solution on the adsorption were studied. The Langmuir and Dubinin鈥揔aganer鈥揜adushkevich (DKR) isotherm models fit the equilibrium data better than Freundlich and Temkin isotherm models, which are used to describe the adsorption of As<sup>Vsup> onto Fe-XAD7-DEHPA resins. The pseudosecond-order model is suitable for describing the adsorption kinetics for As<sup>Vsup> removal from aqueous solutions onto Fe-XAD7-DEHPA resins. Thermodynamic parameters, such as the Gibbs energy (螖G<sup>#sup>), enthalpy (螖H<sup>#sup>), entropy (螖S<sup>#sup>), and equilibrium constant of activation (K<sup>#sup>) are calculated. The adsorption capacities of the both studied materials are found to be almost the same. However, the Fe-XAD7-DEHPA obtained through the CM is the most advantageous as this is obtained in a shorter time than the resin obtained through the DM.