Environmental Biotechnology

Process Biotechnology

Electronic Journal of Biotechnology ISSN: 0717-3458 Vol. 6 No. 3, Issue of December 15, 2003
© 2003 by Pontificia Universidad Católica de Valparaíso -- Chile Received March 25, 2003 / Accepted October 30, 2003
RESEARCH ARTICLE

An evaluation of copper biosorption by a brown seaweed under optimized conditions

Wallace M. Antunes
Departamento de Química Analítica
Instituto de Química
Universidade do Estado do Rio de Janeiro
Rua São Francisco Xavier, 524 550-013
Rio de Janeiro, Brazil
Tel: 55 21 25877322
Fax: 55-21-25877227

Aderval S. Luna
Departamento de Química Analítica
Instituto de Química
Universidade do Estado do Rio de Janeiro
Rua São Francisco Xavier, 524 20550-013
Rio de Janeiro, Brazil
Tel: 55 21 25877322
Fax: 55 21 25877227
E-mail: asluna@uerj.br

Cristiane A. Henriques
Departamento de Química Analítica
Instituto de Química
Universidade do Estado do Rio de Janeiro
Rua São Francisco Xavier, 524 20550-013
Rio de Janeiro, Brazil
Tel: 55 21 25877322
Fax: 55 21 25877227
E-mail: cah@uerj.br 

Antonio Carlos A. da Costa*
Departamento de Tecnologia de Processos Bioquímicos
Instituto de Química
Universidade do Estado do Rio de Janeiro
Rua São Francisco Xavier, 524 20550-013
Rio de Janeiro, Brazil
Tel: 55 21 25877322
Fax: 55 21 2587 7227
E-mail: acosta@uerj.br

*Corresponding author


Keywords:
biosorption, copper, equilibrium, kinetics, Sargassum sp.


Abstract
Full Text

A basic investigation into the removal of copper ions from aqueous solutions by Sargassum sp. was conducted in batch conditions. The influence of different experimental parameters such as initial pH, shaking rate, sorption time, temperature, equilibrium conditions and initial concentrations of copper ions on copper uptake was evaluated. Results indicated that for shaking rates higher than 100 rpm no significant changes in copper accumulation were observed, as well as for pH values between 3.0 and 5.0. No marked effect on the biosorption of copper was detected for temperatures between 298 and 328K. The Langmuir model better represented the sorption process, in comparison to the model of Freundlich. The process followed a second-order kinetics and its calculated activation energy was 5.2 kcal/mol. Due to its outstanding copper uptake capacity (1.48 mmol/g biomass) Sargassum sp. proved to be an excellent biomaterial for accumulating and recovering copper from industrial solutions.

 
Supported by UNESCO / MIRCEN network 
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