title: Pb(II) adsorption by a novel activated carbon - alginate composite material. A kinetic and equilibrium study.
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 0.1-0.75molL-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 10.5mgg-1at I=0.25molL-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.
authors.affiliation: Dipartimento di Fisica e Chimica, Università di Palermo, Viale delle Scienze, I-90128 Palermo, Italy.
authors.forename: Salvatore
authors.initials: S
authors.lastname: Cataldo
authors.affiliation: Dipartimento di Fisica e Chimica, Università di Palermo, Viale delle Scienze, I-90128 Palermo, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Gianguzza
authors.affiliation: Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università degli Studi di Messina, Viale Ferdinando Stagno d'Alcontres, 31, I-98166 Messina, Vill. S. Agata, Italy.
authors.forename: Demetrio
authors.initials: D
authors.lastname: Milea
authors.affiliation: Dipartimento di Fisica e Chimica, Università di Palermo, Viale delle Scienze, I-90128 Palermo, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Muratore
authors.affiliation: Dipartimento di Fisica e Chimica, Università di Palermo, Viale delle Scienze, I-90128 Palermo, Italy. Electronic address: alberto.pettignano@unipa.it.
authors.forename: Alberto
authors.initials: A
authors.lastname: Pettignano
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry*; D002413:Cations, Divalent; D002606:Charcoal / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D009994:Osmolar Concentration; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D000464:Alginates; D002413:Cations, Divalent; D060766:Drinking Water; D006603:Hexuronic Acids; D014874:Water Pollutants, Chemical; D002606:Charcoal; D007854:Lead; D020723:Glucuronic Acid
keywords: Activated carbon; Adsorption; Alginate; Composite material; Pb(II)