Abstract
Di(2-ethylhexyl)phosphoric acid (D2EHPA) in acetone was supported on the Amberlite XAD-1180 polystyrene divinylbenzene copolymer resin. The use of XAD-1180 impregnated with D2EHPA for the extraction of bismuth(III) from nitrate medium was carried out using batch technique. Various parameters affecting the uptake of this metal ion were described in the previous paper (Belkhouche and Didi, 2010) and the capacity of the impregnated resin for bismuth(III) was found to be 490.7 mg/g of resin. Effect of temperature on the values of distribution equilibrium was studied to evaluate the changes in standard thermodynamic quantities. A comparison of Langmuir forms I, II and Freundlich sorption isotherms was realized and the kinetic models applied to the adsorption rate data were evaluated for Lagergren first order, the pseudo second order and Morris–Weber models. From the results, the adsorption of Bi(III) onto D2EHPA/XAD-1180 resin shown the exothermic character and followed the Langmuir form II isotherm. Thus, the capacity of monolayer adsorption of Bi(III) was equal to 769.23 mg/g of resin. Both the Lagergren pseudo first order and film-diffusion models were found to best describe the experimental rate data.
Highlights
The previous paper [1] was devoted to study the kinetics of bismuth(III) extraction from nitrate medium by solvent impregnated resin technique (SIR) using the Amberlite XAD-1180 resin as support for di(2-ethylhexyl) phosphoric acid (D2EHPA) as organophosphorus extractant, in order to know the best operating conditions of later selective extraction from other metals such as lead, copper and tin
The activation energy (Ea) of sorption reaction of bismuth(III) by the XAD-1180 resin impregnated with Di(2-ethylhexyl)phosphoric acid (D2EHPA) was calculated by applying the Arrhenius relation where Ea was be found to 1.14 kJ/mol which confirmed that the sorption was governed by the film-diffusion
The experimental results obtained for the adsorption of bismuth(III) by D2EHPA impregnated onto XAD-4 resin at temperature equal to 295 K under the optimum conditions [1] were tested for Langmuir form I, II and Freundlich adsorption isotherms
Summary
The previous paper [1] was devoted to study the kinetics of bismuth(III) extraction from nitrate medium by solvent impregnated resin technique (SIR) using the Amberlite XAD-1180 resin as support for di(2-ethylhexyl) phosphoric acid (D2EHPA) as organophosphorus extractant, in order to know the best operating conditions of later selective extraction from other metals such as lead, copper and tin. The results were used to determine the constants of polynomial model which described the experimental data of bismuth (III) extraction process. In this present paper we are interested to study the thermodynamic parameters of the distribution equilibrium of Bi(III) sorption process for evaluated the changes in standard thermodynamic quantities. The sorption isotherms such as: Langmuir forms I, II and Freundlich were tested for experimental data of Bi(III) sorption onto D2EHPA/XAD-1180 resin. The kinetics models as the Lagergren first order, the pseudo second order and Morris–Weber were applied for modeling the adsorption rate data
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