title: Biosorption of cadmium with brown macroalgae.
abstract: Sorption experiments for cadmium removal using two brown macroalgae Lessonia nigrescens and Durvillaea antarctica were carried out. Although both types of algae were capable of retaining cadmium, differences in their performance were observed. The optimum pH was 3.7±0.2, and to achieve the equilibrium, 5 days of contact time were necessary for both biosorbents. The maximum experimental uptake obtained was similar for the two biosorbents: 95.3 mg Cd g(-1) by D. antarctica and 109.5 mg Cd g(-1) by L. nigrescens. The Langmuir model described the equilibrium sorption isotherms very well for both biosorbents and the Lagergren pseudo primer order model described the sorption kinetics for L. nigrescens satisfactorily and the Ho and Mckay pseudo second order model for D. antarctica. It was found that cadmium uptake by D. antarctica was faster than by L. nigrescens.
authors.affiliation: Departamento de Ingenieria Quimica y Ambiental, Universidad Técnica Federico Santa Maria, Avenida España 1680, Valparaiso, Chile.
authors.forename: Claudia
authors.initials: C
authors.lastname: Gutiérrez
authors.affiliation: Departamento de Ingenieria Quimica y Ambiental, Universidad Técnica Federico Santa Maria, Avenida España 1680, Valparaiso, Chile. Electronic address: henrik.hansen@usm.cl.
authors.forename: Henrik K
authors.initials: HK
authors.lastname: Hansen
authors.affiliation: Departamento de Ingenieria Quimica y Ambiental, Universidad Técnica Federico Santa Maria, Avenida España 1680, Valparaiso, Chile.
authors.forename: Piroska
authors.initials: P
authors.lastname: Hernández
authors.affiliation: Departamento de Ingenieria Quimica y Ambiental, Universidad Técnica Federico Santa Maria, Avenida España 1680, Valparaiso, Chile.
authors.forename: Carolina
authors.initials: C
authors.lastname: Pinilla
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008962:Models, Theoretical; D000459:Phaeophyceae / Q000737:chemistry*; D012624:Seaweed / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D002104:Cadmium; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Adsorption isotherm; Cadmium uptake; Durvillaea antarctica; Lessonia nigrescens; Sorption kinetics