Abstract
Hydrous, amorphous MnO2–ZrO2 composite was prepared as a new inorganic composite material under various conditions for removal of Sr2+ ion from aqueous solutions. The physico-chemical characterization was carried out by Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy and thermogravimetry. The maximum sorption capacity for synthesized composite was evaluated as 1.5 meq/g sorbent and batch experiments were carried out as a function of contact time, aqueous phase pH, temperature and initial metal ions concentration of adsorptive solution. The results indicated that under optimal conditions, Sr2+ ions could be efficiently removed using MnO2–ZrO2 composite from aqueous solutions when pH > 5. The equilibrium isotherms were determined and the sorption data were successfully modeled using Langmuir model. Kinetics of the process was studied by considering a pseudo second-order model. This model predicted chemisorption as the adsorption mechanism. The results of thermodynamic investigation reveal that the adsorption process of the studied ion is entropy driven.
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Ahmadi, S.J., Akbari, N., Shiri-Yekta, Z. et al. Adsorption of strontium ions from aqueous solution using hydrous, amorphous MnO2–ZrO2 composite: a new inorganic ion exchanger. J Radioanal Nucl Chem 299, 1701–1707 (2014). https://doi.org/10.1007/s10967-013-2852-9
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DOI: https://doi.org/10.1007/s10967-013-2852-9