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Journal of Chemistry
Volume 2017, Article ID 4296515, 8 pages
Research Article

Pb(II) Removal Process in a Packed Column System with Xanthation-Modified Deoiled Allspice Husk

1Centro Conjunto de Investigación en Química Sustentable (CCIQS), Universidad Autónoma del Estado de México (UAEMex), UAEM-UNAM, Carretera Toluca-Atlacomulco, km 14.5, 50200 Toluca, MEX, Mexico
2Centro Interamericano de Recursos del Agua (CIRA), UAEMex, Carretera Toluca-Atlacomulco, km 14.5, 50200 Toluca, MEX, Mexico

Correspondence should be addressed to Gabriela Roa-Morales; moc.liamg@maorybag

Received 24 July 2016; Revised 19 October 2016; Accepted 25 October 2016; Published 29 January 2017

Academic Editor: Julie J. M. Mesa

Copyright © 2017 Efrain Palma-Anaya et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The present research dealt with lead removal using modified Pimenta dioica L. Merrill as biosorbent in a batch and in continuous flow column systems, respectively. The allspice husk residues were modified first with a treatment through the xanthation reaction. For the adsorption tests, the atomic adsorption spectrophotometry method was used to determine the lead concentrations in the liquid samples. In the kinetic batch study (10 mg of sorbent in 10 mL of 25 mg L−1 lead solution), the removal efficiency was 99% (adsorption capacity of 25.8 mg g−1). The kinetic data followed the pseudo-second-order model. The adsorption isotherm was fitted to the Freundlich model, where constants were and (8.06 mg g−1 L and 0.52), corresponding to adsorption capacities of 8 and 62 mg g−1, at liquid equilibrium concentration of 1 and 50 mg L−1, respectively. In the continuous flow systems where lead solution of 50 mg L−1 was treated in 2 columns of 5 cm (4.45 g) and 10 cm (9.07 g) bed heights, the dynamic adsorption capacity obtained by fitting the Thomas model was 29.114 mg g−1 and 45.322 mg g−1, respectively.