title: Biosorption of lead by maize (Zea mays) stalk sponge.
abstract: This study investigated the removal of Pb(II) from aqueous solutions by a maize (Zea mays) stalk sponge. Equilibrium and kinetic models for Pb(II) sorption were developed by considering the effect of the contact time and concentration at the optimum pH of 6 +/- 0.2. The Freundlich model was found to describe the sorption energetics of Pb(II) by Z. mays stalk sponge, and a maximum Pb(II) loading capacity of 80 mg g(-1) was determined. The kinetic parameters were obtained by fitting data from experiments measuring the effect of contact time on adsorption capacity into pseudo-first and second-order equations. The kinetics of Pb(II) sorption onto Z. mays biosorbent were well defined using linearity coefficients (R(2)) by the pseudo-second-order equation (0.9998). The results obtained showed that Zea may stalk sponge was a useful biomaterial for Pb(II) sorption and that pH has an important effect on metal biosorption capacity.
authors.affiliation: Universidad Autónoma del Estado de México, Facultad de Química, Chemestry, Paseo Colón esquina Paseo Tollocan S/N, C.P. 50120, Toluca, Mexico. gegaromx@yahoo.com.mx
authors.forename: G
authors.initials: G
authors.lastname: García-Rosales
authors.forename: A
authors.initials: A
authors.lastname: Colín-Cruz
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000493:pharmacokinetics*; D018547:Plant Stems; D014874:Water Pollutants, Chemical / Q000493:pharmacokinetics*; D018508:Water Purification / Q000379:methods*; D003313:Zea mays / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D007854:Lead