Abstract
The present work investigated the ability of inactive brown seaweed, Turbinaria conoides, to biosorb aluminum(III) and cadmium(II) ions in both single and binary systems. Initial experiments were undertaken to determine the influence of pH and biosorption isotherms of each metallic ion. Owing to the presence of carboxylic groups, T. conoides exhibited high uptake capacity towards Al(III) and Cd(II) through ion-exchange mechanism. In the case of Al(III), T. conoides exhibited maximum biosorption at pH 4 with a capacity of 2.37 mmol/g, whereas the highest Cd(II) biosorption occurred at pH 5 with a capacity of 0.96 mmol/g. For both metal ions, T. conoides exhibited fast kinetics. Several models were used to describe isotherm (Langmuir, Freundlich, Redlich-Peterson, and Toth) and kinetic (pseudo-first and pseudo-second order) data. Desorption and reuse of T. conoides biomass in three repeated cycles was successful with 0.1 M HCl as elutant. In binary systems, the presence of Cd(II) severely affected Al(III) uptake by T. conoides. Compared to single-solute systems, Al(III) uptake was reduced to 56% compared to only 27% for Cd(II). Based on the model parameters regressed from the respective monometal systems, multicomponent Langmuir and Freundlich models were used to predict binary (Al + Cd) system of which the multicomponent Freundlich model was able to describe with good accuracy.
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The author gratefully acknowledges the support and contributions of the Singapore-Delft Water Alliance (SDWA) to this project.
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Vijayaraghavan, K., Gupta, S. & Joshi, U.M. Comparative Assessment of Al(III) and Cd(II) Biosorption onto Turbinaria conoides in Single and Binary Systems. Water Air Soil Pollut 223, 2923–2931 (2012). https://doi.org/10.1007/s11270-012-1075-y
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DOI: https://doi.org/10.1007/s11270-012-1075-y