Phosphorus adsorption onto an industrial acidified laterite by-product: equilibrium and thermodynamic investigation

Abstract : The present research investigates the uptake of phosphate ions from aqueous solutions using acidified laterite (ALS), a by-product from the production of ferric aluminium sulfate using laterite. Phosphate adsorption experiments were performed in batch systems to determine the amount of phosphate adsorbed as a function of solution pH, adsorbent dosage and thermodynamic parameters per fixed P concentration. Kinetic studies were also carried out to study the effect of adsorbent particle sizes. The maximum removal capacity of ALS observed at pH5 was 3.68mg Pg(-1). It was found that as the adsorbent dosage increases, the equilibrium pH decreases, so an adsorbent dosage of 1.0gL(-1) of ALS was selected. Adsorption capacity (q(m)) calculated from the Langmuir isotherm was found to be 2.73mgg(-1). Kinetic experimental data were mathematically well described using the pseudo first-order model over the full range of the adsorbent particle size. The adsorption reactions were endothermic, and the process of adsorption was favoured at high temperature; the G and H values implied that the main adsorption mechanism of P onto ALS is physisorption. The desorption studies indicated the need to consider a NaOH 0.1M solution as an optimal solution for practical regeneration applications. (c) 2014 Curtin University of Technology and John Wiley & Sons, Ltd.
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Submitted on : Thursday, September 24, 2015 - 4:33:41 PM
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Yoann Glocheux, Martin Mendez Pasarin, Ahmad B. Albadarin, Chirangano Mangwandi, Florent Chazarenc, et al.. Phosphorus adsorption onto an industrial acidified laterite by-product: equilibrium and thermodynamic investigation. Asia-Pacific Journal of Chemical Engineering, Wiley, 2014, 9 (6), pp.929-940. ⟨10.1002/apj.1843⟩. ⟨hal-01204906⟩

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