Resumo

MEJIA MIRANDA, Carlos; LAVERDE, Dionisio; AVELLA, Verónica  e  PENA BALLESTEROS, Darío Yesid. Adsorption of Ni(II) ions on pellets of benthonitic clay. Rev. ion [online]. 2015, vol.28, n.2, pp.61-68. ISSN 0120-100X.  https://doi.org/10.18273/revion.v28n2-2015005.

The presence of metal ions in wastewater generates a toxic effect on marine ecosystems and public health. Clays are naturally occurring materials with high adsorption capacity, low cost, practical for implementation in industrial scale for the removal of metal ions. Its implementation is limited to the development of alternatives to the use of these clays on a large scale and continuous processes. Pelletizing clays can be used in fi xed bed columns. In this work the kinetics of adsorption of nickel ions on a benthonitic pelletized clay was evaluated. The extrudes were prepared by wetting the clay with a solution acidifi ed with nitric acid at 2%v. The proportion of clay / aqueous solution volume was 2:1. The adsorption kinetics of Ni(II) a pseudo second-order model is adjusted. The kinetic constants of the fi tted model were 2.792x10^-3, 8.085x10^-4 and 6.292x10^-4g/mg.min and reaction temperatures for 25, 45 and 60°C, respectively. From the lineation of Arrhenius activation energy and frequency factor for the reaction of adsorption of nickel ions onto bentonite clay was determined to be 29.58kJ/mol and 507.15g/mg.min, respectively. The magnitude of the activation energy indicates that the controlling step in the adsorption is the chemisorption of the nickel ions on the clay surface

Palavras-chave : nickel; adsorption; bentonites; clays; kinetic.

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