Monday, May 4, 2009
9-66
Batch Equilibrium and Kinetic Studies – Biosorption of Uranium by Sargassum filipendula Biomass
Jose Ivan Rodrigues Silva1, Ana Cristina de Melo Ferreira1, and Antonio Carlos A. da Costa2. (1) Seana, IRD/CNEN, AV. SALVADOR ALLENDE S/N, RECREIO DOS BANDEIRANTES, Rio de Janeiro, Brazil, (2) Programa de Pós-graduação em Engenharia Quimica, Universidade do Estado do Rio de Janeiro - Instituto de Quimica, Rua São Francisco Xavier, 524 - PHLC - sala 310, Rio de Janeiro, 20559900, Brazil
Sargassum filipendula biomass was used as biosorbent material for Uranium in batch conditions. Kinetic and equilibrium conditions were studied. Results obtained indicated that Sargassum filipendula biomass reached equilibrium after 60 minutes of contact with a 1.0 mg/L and a 100.0 mg/L solution. This is an indication that the concentration of soluble Uranium in solution did not affect the kinetics of the process. The kinetic behavior observed indicated a 20-30% biosorption of Uranium in the first 20 minutes of process followed by a slower uptake up to 38% Uranium biosorption.
The kinetic modeling of the process indicated that the less concentrated Uranium solution fitted well to a second-order kinetic model, while the 100.0 mg/L solution fitted well both the first and second-order kinetic models. Those conclusions were reached based on the high correlation coefficients obtained.
Equilibrium batch tests showed that Uranium biosorption was equivalent, both after 1 hour and 3 hours of contact between the biomass and distinct Uranium solutions. Freundlich and Langmuir models were used to fit the experimental data. The Freundlich model best described Uranium biosorption, in comparison to the Langmuir model, based on higher correlation coefficients obtained.
The kinetic modeling of the process indicated that the less concentrated Uranium solution fitted well to a second-order kinetic model, while the 100.0 mg/L solution fitted well both the first and second-order kinetic models. Those conclusions were reached based on the high correlation coefficients obtained.
Equilibrium batch tests showed that Uranium biosorption was equivalent, both after 1 hour and 3 hours of contact between the biomass and distinct Uranium solutions. Freundlich and Langmuir models were used to fit the experimental data. The Freundlich model best described Uranium biosorption, in comparison to the Langmuir model, based on higher correlation coefficients obtained.