The adsorption capacity of an activated carbon – calcium alginate composite material (ACAA-Ca) has been tested with the aim of developing a new and more efficient adsorbent material to remove Pb(II) ion from aqueous solution. The study was carried out at pH = 5, in NaCl medium and in the ionic strength range 0.1–0.75 mol L−1. Differential Pulse Anodic Stripping Voltammetry (DP-ASV) technique was used to check the amount of Pb(II) ion removed during kinetic and equilibrium experiments. Different kinetic (pseudo first order, pseudo second order and Vermuelen) and equilibrium (Langmuir and Freundlich) models were used to fit experimental data, and were statistically compared. Calcium alginate (AA-Ca) improves the adsorption capacity (qm) of active carbon (AC) in the ACAA-Ca adsorbent material (e.g., qm = 15.7 and 10.5 mg g−1 at I = 0.25 mol L−1, for ACAA-Ca and AC, respectively). SEM-EDX and thermogravimetric (TGA) measurements were carried out in order to characterize the composite material. The results of the speciation study on the Pb(II) solution and of the characterization of the ACAA-Ca and of the pristine AA-Ca and AC were evaluated in order to explain the specific contribution of AC and AA-Ca to the adsorption of the metal ion.

Cataldo, S., Gianguzza, A., Milea, D., Muratore, N., Pettignano, A. (2016). Pb(II) adsorption by a novel activated carbon – alginate composite material. A kinetic and equilibrium study. INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, 92, 769-778 [10.1016/j.ijbiomac.2016.07.099].

Pb(II) adsorption by a novel activated carbon – alginate composite material. A kinetic and equilibrium study

CATALDO, Salvatore;GIANGUZZA, Antonio;MURATORE, Nicola;PETTIGNANO, Alberto
2016-01-01

Abstract

The adsorption capacity of an activated carbon – calcium alginate composite material (ACAA-Ca) has been tested with the aim of developing a new and more efficient adsorbent material to remove Pb(II) ion from aqueous solution. The study was carried out at pH = 5, in NaCl medium and in the ionic strength range 0.1–0.75 mol L−1. Differential Pulse Anodic Stripping Voltammetry (DP-ASV) technique was used to check the amount of Pb(II) ion removed during kinetic and equilibrium experiments. Different kinetic (pseudo first order, pseudo second order and Vermuelen) and equilibrium (Langmuir and Freundlich) models were used to fit experimental data, and were statistically compared. Calcium alginate (AA-Ca) improves the adsorption capacity (qm) of active carbon (AC) in the ACAA-Ca adsorbent material (e.g., qm = 15.7 and 10.5 mg g−1 at I = 0.25 mol L−1, for ACAA-Ca and AC, respectively). SEM-EDX and thermogravimetric (TGA) measurements were carried out in order to characterize the composite material. The results of the speciation study on the Pb(II) solution and of the characterization of the ACAA-Ca and of the pristine AA-Ca and AC were evaluated in order to explain the specific contribution of AC and AA-Ca to the adsorption of the metal ion.
2016
Cataldo, S., Gianguzza, A., Milea, D., Muratore, N., Pettignano, A. (2016). Pb(II) adsorption by a novel activated carbon – alginate composite material. A kinetic and equilibrium study. INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, 92, 769-778 [10.1016/j.ijbiomac.2016.07.099].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/189570
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