Use of pH-sensitive polymer hydrogels in lead removal from aqueous solution

Elizabeth Ramírez; S Guillermina Burillo; C Barrera-Díaz; Gabriela Roa; Bryan Bilyeu

doi:10.1016/j.jhazmat.2011.04.109

Use of pH-sensitive polymer hydrogels in lead removal from aqueous solution

J Hazard Mater. 2011 Aug 30;192(2):432-9. doi: 10.1016/j.jhazmat.2011.04.109. Epub 2011 May 27.

Authors

Elizabeth Ramírez¹, S Guillermina Burillo, C Barrera-Díaz, Gabriela Roa, Bryan Bilyeu

Affiliation

¹ Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Carretera Toluca-Atlacomulco, km 14.5, Unidad El Rosedal, C.P. 50200, Toluca, Edo. de México, Méx, México.

PMID: 21705138
DOI: 10.1016/j.jhazmat.2011.04.109

Abstract

Three gamma crosslinked polymeric hydrogels were synthesized and evaluated as lead ion sorbents. A crosslinked poly(acrylic acid) hydrogel was compared with two 4-vinylpiridine-grafted poly(acrylic acid) hydrogels (26.74 and 48.1% 4-vinylpiridine). The retention properties for Pb(II) from aqueous solutions of these three polymers were investigated by batch equilibrium procedure. The effects of pH, contact time and Pb(II) concentration were evaluated. The optimal pH range for all polymers was 4-6. The lightly grafted polymer (PAAc-g-4VP at 26.74%) exhibited a Pb(II) removal close to 80% at 5h and above 90% at 24h. The maximum Pb(II) removal was 117.9mg g(-1) of polymer and followed the Freundlich adsorption model. XPS characterization indicates that the carboxyl groups are involved in the Pb(II) removal.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Hydrogels / chemistry*
Hydrogen-Ion Concentration*
Lead / isolation & purification*
Polymers / chemistry*
Solutions
Water / chemistry*

Substances

Hydrogels
Polymers
Solutions
Water
Lead