title: Cu(II) and Zn(II) adsorption capacity of three different clay liner materials.
abstract: Sorption of Cu(II) and Zn(II) on three natural clays meeting the international requirements for use as liners was evaluated by means of batch tests. The purpose of this research was to determine the retention capacities of the clays for metal cations commonly present in urban solid waste leachates. The pH and ionic strength conditions were set at values frequently found in real leachates. The changes observed in the XRD patterns and FTIR spectra upon adsorption can be considered an evidence of clay-metal electrostatic interaction. The Langmuir model was found to best describe the sorption processes, offering maximum sorption capacities from 8.16 to 56.89 mg/g for Cu(II) and from 49.59 to 103.83 mg/g for Zn(II). All samples remove more Zn(II) than Cu(II), which may be related to the different geometry of the hydrated Cu(II) cation. The total amount of metal sorption was strongly influenced by the total specific surface area, the presence of carbonates and the smectite content of the clays. In addition to their known quality as physical barriers, the adsorbed amounts obtained indicate the suitability of the tested clays to contribute to the retardation of Cu(II) and Zn(II) transport through clay liners.
authors.affiliation: CONICET - Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, PROBIEN (CONICET-UNCo) y Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén 8300, Argentina. Electronic address: telmamusso@gmail.com.
authors.forename: T B
authors.initials: TB
authors.lastname: Musso
authors.affiliation: Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, PROBIEN (CONICET-UNCo) y Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén 8300, Argentina. Electronic address: maria.parolo@fain.uncoma.edu.ar.
authors.forename: M E
authors.initials: ME
authors.lastname: Parolo
authors.affiliation: Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, PROBIEN (CONICET-UNCo) y Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén 8300, Argentina. Electronic address: gisela.pettinari@fain.uncoma.edu.ar.
authors.forename: G
authors.initials: G
authors.lastname: Pettinari
authors.affiliation: Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba, CONICET. Vélez Sarsfield 1611, Córdoba 5016, Argentina. Electronic address: ffrancis@efn.uncor.edu.
authors.forename: F M
authors.initials: FM
authors.lastname: Francisca
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D002412:Cations; D000077215:Clay; D003300:Copper / Q000737:chemistry*; D006801:Humans; D019216:Metals, Heavy / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D002412:Cations; D019216:Metals, Heavy; D003300:Copper; D015032:Zinc; D000077215:Clay
keywords: Clay liners; Clay minerals; Heavy metals; Sorption