Produção Nacional
Revisado por pares
Biosorption and Diffusion Modeling of Pb(II) by Malt Bagasse
2016; Hindawi Publishing Corporation; Volume: 2016; Linguagem: Inglês
10.1155/2016/4210561
ISSN1687-8078
AutoresKlaiani Bez Fontana, Giane Gonçalves Lenzi, Erica Roberta Lovo da Rocha Watanabe, E. K. Lenzi, Juliana Martins Teixeira de Abreu Pietrobelli, Eduardo S. Chaves,
Tópico(s)Analytical chemistry methods development
ResumoThe 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 G ° and positive values of Δ H ° 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.
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