Klaiani B. Fontana, Giane Gonçalves, Érica R. L. R. Watanabe, Ervin K. Lenzi, Juliana A. M. T. Pietrobelli, Eduardo S. Chaves.

New Chemistry – Volume: 2016, Páginas: 11, DOI: 10.1155/2016/4210561

The removal of Pb(II) from water by biosorption processes onto malt bagasse was investigated and the kinetic and thermodynamic
parameters were obtained; additionally a diffusion modeling was proposed. The characterization of malt bagasse was performed
by FTIR and SEM/EDS. The experiments were conducted in batch system and an experimental design based response surface
methodology was applied for agitation speed and pH optimization. The kinetics of biosorption followed pseudo-second-order
model and the temperature of the process affected the biosorption capacity. Isotherm models of Langmuir, Freundlich, and Elovich
were applied and the Langmuir model showed better fit and the estimated biosorption capacity was 29.1 mg g−1. The negative values
obtained for Δ∘ and positive values of Δ∘ confirm, respectively, the spontaneous and endothermic nature of the process. The
diffusion modeling was performed based on experiments in the absence of agitation to investigate the influence of the biosorbent
on the sorption process of Pb(II) ions.