DBPapers

REMOVAL OF Hg2+ AND Pb2+ IONS FROM AQUEOUS SOLUTIONS ON CORN COBS BIOMATERIALS II. KINETICS AND SORPTION MECHANISM

AUTHOR/S: D. S. STEFAN, M. BELCU, I. MEGHEA
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 2, 787-794 pp

ABSTRACT

The presence of heavy metals in environmental factors remains among the most
important concerns at national and international levels, while at the same time novel
biomaterials usually derived from agricultural wastes are designed and tested for their
removal below admitted limits. In this respect efficiency of biosorption of Hg2+ and
Pb2+ on corn cobs have been studied for different working parameters: initial solution
concentrations of heavy metals, particle size of biomass and temperature. The kinetic
model for pseudo-second order provided the best fitting of the experimental data. The
poor fitting of the experimental data into equations characteristic for the diffusion
processes lead to the conclusion that the process rate-determining step is the ions
coupling with the sorbent active centers by physical-chemical interactions.

Keywords: biosorption, corn cobs, kinetics, heavy metals, Hg2+, Pb2+