Kazem Naddafi
Department of Enviromnental Health Engineering,
School of Public Health and Institute of Public Health Research,
Tehran University of Medical Sciences, Tehran, Iran
Ramin Nabizadeh
Department of Enviromnental Health Engineering,
School of Public Health and Institute of Public Health Research,
Tehran University of Medical Sciences, Tehran, Iran
Reza Saeedi
Department of Enviromnental Health Engineering,
School of Public Health and Institute of Public Health Research,
Tehran University of Medical Sciences, Tehran, Iran
ABSTRACT
Biosorption kinetics of lead (II) and cadmium (II) from aqueous solutions by Sargassum sp. biomass were studied. Kinetic experiments were done in three initial concentrations of Pb2+ and Cd2+ and fixed initial ratio of adsorbate to biosorbent in single component batch system. The heavy metals uptake was found to be rapid for all concentrations and reached to 88-96% of equilibrium capacity of biosorption in 15 min. Monitoring of pH in the kinetic experiments presented the simultaneous release of H+ with the uptake of Pb2+ and Cd2+, therefore ion exchange was confirmed to be one of the biosorption mechanisms. The experimental data were analyzed using four sorption kinetic models; the pseudo first-order (Langergren), pseudo second-order, saturation (mixed-order) and second-order rate equations. The pseudo second-order and saturation rate equations described the biosorption kinetics of Pb2+ and Cd2+ with high correlation coefficient (R2>0.99) and better than the other equations. Kinetic analysis presented a direct relationship between initial Pb2+ and Cd2+ concentrations and the rate of biosorption. The maximum uptake capacities of Sargassum sp. biomass for Pb2+ and Cd2+ were obtained 1.07 and 0.79 mM g-1, respectively.
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How to cite this article
Kazem Naddafi, Ramin Nabizadeh and Reza Saeedi, 2005. Kinetics Modeling of Lead (II) and Cadmium (II) Biosorption from Aqueous
Solutions by Brown Algae Sargassum sp. Biomass. Pakistan Journal of Biological Sciences, 8: 1250-1255.
DOI: 10.3923/pjbs.2005.1250.1255
URL: https://scialert.net/abstract/?doi=pjbs.2005.1250.1255
DOI: 10.3923/pjbs.2005.1250.1255
URL: https://scialert.net/abstract/?doi=pjbs.2005.1250.1255
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april Reply
more studies about seaweeds application in industry is needed