CHARACTERIZATION AND SURFACE REACTIVITY OF NATURAL AND SYNTHETIC MAGNETITES: II. ADSORPTION OF Pb(II) AND Zn(II)

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Carlos Adolfo Salazar Camacho
Mario Villalobos Peñalosa

Resumen

Two synthetic and three natural magnetite samples that were obtained from an iron ore deposit located in Central-Western Mexico, were used to investigate the magnetite surface reactivity of different particle sizes towards aqueous Pb(II) and Zn(II). From these, the synthetic samples < 50 nm [specific surface area (SSA)] = 39.3 m2/g), 5 µm (SSA = 7.3 m2/g), and natural samples 948-fine (SSA = 7.6 m2/g), 948 (SSA = 3.0 m2/g) and 996 (SSA = 1.4 m2/g), successfully removed Pb(II) from aqueous solutions at the investigated pH value of 5.8, but only the three first, finer magnetites removed significant aqueous Zn(II) at pH 7.0. The adsorption kinetics data were fitted using pseudo-second order and intraparticle models. The Pb(II) adsorption capacities were 140.1, 33.3, 65.4, 69.8 and 17.0 µmol/g, for samples < 50 nm, < 5 µm, 948-fine, 948 and 996, respectively, while for Zn(II) they were 159.2, 38.8 and 28.2 µmol/g, for the first three previous samples, respectively. These adsorption capacities suggest that magnetite may play an important role as adsorbents of cationic contaminants in the environment, or that it may be used as efficient remediating agent, but it’s limited to particle sizes with specific surface areas above 3 m2/g.

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Biografía del autor/a

Carlos Adolfo Salazar Camacho, universidad del chocó

Facultad de Ciencias Naturales, Departamento de Biología, Universidad Tecnológica del Chocó (UTCH), Ciudadela Universitaria, A. A. 292, Quibdó, Colombia. 

Docente-Investigador Tiempo Completo

Mario Villalobos Peñalosa, Universidad Nacional Autónoma de México

Laboratorio de Geoquímica Ambiental, Departamento de Geoquímica,  Instituto de Geología,  Universidad Nacional Autónoma de México (UNAM), Coyoacán, Ciudad Universitaria, México 04510 D. F.

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