title: Adsorption of Cu(II), Zn(II), Cd(II) and Pb(II) by dead Avena fatua biomass and the effect of these metals on their growth.
abstract: The biosorption of copper(II), zinc(II), cadmium(II) and lead(II) from aqueous solutions by dead Avena fatua biomass and the effect of these metals on the growth of this wild oat were investigated. Pseudo-first- and second-order and intra-particle diffusion models were applied to describe the kinetic data and to evaluate the rate constants. The adsorption kinetics of all the metals follows a pseudo-second-order model. The adsorption capacity was determined, and the Freundlich and Langmuir models were applied. The experimental data obtained for all the metals are best described by the Langmuir model. A. fatua was characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and zeta potential. The results obtained evidence the presence of Zn(II), Cu(II), Cd(II) or Pb(II) on the surface of the weed. The growth of A. fatua was affected by the presence of all metals. The decrease in the growth rate with increasing metal concentration was more noticeable for zinc.
authors.affiliation: INQUIMAE and Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pabellón II 3er Piso, C1428EHA Buenos Aires, Argentina.
authors.forename: María Mar
authors.initials: MM
authors.lastname: Areco
authors.forename: Leila
authors.initials: L
authors.lastname: Saleh-Medina
authors.forename: María Alcira
authors.initials: MA
authors.lastname: Trinelli
authors.forename: Jose Luis
authors.initials: JL
authors.lastname: Marco-Brown
authors.forename: María
authors.initials: M
authors.lastname: Dos Santos Afonso
mesh_terms: D000327:Adsorption; D018554:Avena / Q000737:chemistry* / Q000254:growth & development; D018533:Biomass; D002104:Cadmium / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D007854:Lead / Q000737:chemistry*; D013499:Surface Properties; D015032:Zinc / Q000737:chemistry*
chemical_list: D002104:Cadmium; D007854:Lead; D003300:Copper; D015032:Zinc