Study of biosorption of rare earth metals (La, Nd, Eu, Gd) by Sargassum sp. biomass in batch systems: Physicochemical evaluation of kinetics and adsorption models

• Autor(a) principal: Oliveira, R. C. [UNESP]
• Data de Publicação: 2009
• Outros Autores: Garcia, O. [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.4028/www.scientific.net/AMR.71-73.605; http://hdl.handle.net/11449/71500
• topic: Biosorption; Physicochemical modeling; Rare earth metals; Sargassum sp.; Adsorption model; Batch systems; Best approximations; Biosorption process; Experimental data; Initial velocities; Langmuir adsorption model; Metal adsorption; Metal selectivity; Metal uptake; Physicochemical model; Pseudo-second-order kinetic models; Sargassum sp; Adsorption; Biomass; Europium; Gadolinium; Lanthanum; Metals; Neodymium; Rare earths; Metal recovery

This work evaluated kinetic and adsorption physicochemical models for the biosorption process of lanthanum, neodymium, europium, and gadolinium by Sargassum sp. in batch systems. The results showed: (a) the pseudo-second order kinetic model was the best approximation for the experimental data with the metal adsorption initial velocity parameter in 0.042-0.055 mmol.g -1.min-1 (La < Nd < Gd < Eu); (b) the Langmuir adsorption model presented adequate correlation with maximum metal uptake at 0.60-0.70 mmol g-1 (Eu < La < Gd < Nd) and the metal-biomass affinity parameter showed distinct values (Gd < Nd < Eu < La: 183.1, 192.5, 678.3, and 837.3 L g-1, respectively); and (c) preliminarily, the kinetics and adsorption evaluation did not reveal a well-defined metal selectivity behavior for the RE biosorption in Sargassum sp., but they indicate a possible partition among RE studied. © (2009) Trans Tech Publications.