Biosorption of radioactive thorium by Sargassum filipendula |
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Authors: | Marta Cristina Picardo Ana Cristina de Melo Ferreira Antonio Carlos Augusto da Costa |
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Institution: | Universidade do Estado do Rio de Janeiro, Instituto de Quimica, Programa de Pos-Graduacao em Engenharia Quimica--PPG-EQ. Rua Sao Francisco Xavier 524, Pavilhao Haroldo Lisboa da Cunha, Sala 400, Rio de Janeiro, Brazil, 20550-013. |
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Abstract: | In the present work, the biosorption of radioactive thorium was investigated using a dry biomass of Sargassum filipendula as the biosorbent material. Radioactive solutions containing between 2.0 and 500.0μg thorium were tested by biosorption with
S. filipendula, yielding uptake capacities from 20 to 100%, depending on the concentration of the solution. Kinetic studies indicated that
equilibrium between the thorium solution and the solid fraction was achieved after three hours of contact and that a second-order
model could express the equilibrium kinetics. In order to investigate the maximum biosorption capacity of the biomass an isotherm
was done, based on the experimental data, which revealed the maximum uptake capacity to be 2.59 μmol thorium/g biomass. The
experimental data fitted well to a Langmuir model, which provided a good correlation between the experimental and predicted
thorium uptake values. |
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Keywords: | Sargassum filipendula thorium wastewater biosorption kinetic models |
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