Abstract
Beidellite, a low-cost, locally available and natural mineral was used as an adsorbent for the removal of lead and cadmium ions from aqueous solutions in batch experiments. The kinetics of adsorption process was tested for the pseudo first-order, pseudo second-order reaction and intra-particle diffusion models. The rate constants of adsorption for all these kinetic models were calculated. Comparison amongst the models showed that the sorption kinetics was best described by the pseudo second-order model. Langmuir and Freundlich isotherm models were applied to the experimental equilibrium data for different temperatures. The adsorption capacities (Q°) of beidellite for lead and cadmium ions were calculated from the Langmuir isotherm. It was found that adsorption capacity was in the range of 83.3–86.9 for lead and 42–45.6 mg/g for cadmium at different temperatures. Thermodynamic studies showed that the metal uptake reaction by beidellite was endothermic in nature. Binary metal adsorption studies were also conducted to investigate the interactions and competitive effects in binary adsorption process. Based on the optimum parameters found, beidellite can be used as adsorbent for metal removal processes.
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Acknowledgments
This study was partly supported by the Scientific Research Fund of Gebze Institute of Technology (2008-A20), Kocaeli, Turkey. The authors also wish to thank the anonymous referee for improving this manuscript.
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Etci, Ö., Bektaş, N. & Öncel, M.S. Single and binary adsorption of lead and cadmium ions from aqueous solution using the clay mineral beidellite. Environ Earth Sci 61, 231–240 (2010). https://doi.org/10.1007/s12665-009-0338-4
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DOI: https://doi.org/10.1007/s12665-009-0338-4