Modeling of lead (II) biosorption by residue of allspice in a fixed-bed column

•Pb(II) ions can be successfully adsorbed (99%) by a continuous column of allspice residue.•Column service time is 272min at a flow of 20mL/min, column length of 15cm, and C0=15mgPb(II)/L.•Traditional models only provide information on maximum sorption capacity and kinetic coefficients.•Mass Transfe...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2013-07, Vol.228, p.21-27
Hauptverfasser: Cruz-Olivares, J., Pérez-Alonso, C., Barrera-Díaz, C., Ureña-Nuñez, Fernando, Chaparro-Mercado, M.C., Bilyeu, Bryan
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Sprache:eng
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Zusammenfassung:•Pb(II) ions can be successfully adsorbed (99%) by a continuous column of allspice residue.•Column service time is 272min at a flow of 20mL/min, column length of 15cm, and C0=15mgPb(II)/L.•Traditional models only provide information on maximum sorption capacity and kinetic coefficients.•Mass Transfer model provides information on the sorption mechanism. Residue of allspice (Pimenta dioica L. Merrill) obtained as a by-product from the essential oil supercritical extraction process, has been evaluated as a biosorbent for removing lead (II) from aqueous solutions in batch studies, but not in a practical system like a fixed bed column [12,13]. In this paper, the effects of flow rate (20 and 40mL/min), bed depth (8 and 15cm) and influent lead concentration (15 and 25mg/L) on the adsorption capacity of the residue of allspice in a fixed-bed column were investigated. The highest adsorption capacity (99.2%) on a 15mg/L Pb(II) solution was achieved within a flow rate of 20mL/min and a bed depth of 15cm. The experimental data obtained from the adsorption process was successfully correlated with the Thomas, Adams–Bohart, Yoon–Nelson, Bed Depth Service Time (BDST), and Dose Response models. A rigorous model based on the differential balance mass transfer was also used to describe the adsorption process in the column. The results of the parameters zone mass transfer, diffusion and mass transfer coefficients obtained with modeling the continuous process could be applied to scale up the process to an actual industrial column.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2013.04.101