Abstract
Sorption of heavy metal cations (Pb(II), Cr(III), Cd(II), Ni(II)) from aqueous solutions on natural Na-clinoptilolite was studied using atomic absorption spectrometry (AAS) and FT-IR spectroscopy. It was found that the sorption capacity of clinoptilolite decreases in the following order: Pb(II) (22,600 mg/kg), Cr(III) (21,200 mg/kg), Cd(II) (10,400 mg/kg) and Ni(II) (6,200 mg/kg). In the FT-IR spectra of the samples, in the region of pseudolattice vibrations (500–800 cm−1), systematic changes connected with the type of cation and its concentration in the initial solution were observed. The proportions of ion exchange and chemisorption in the whole process of sorption were also estimated. It was found that the amount of cations sorbed on clinoptilolite depended on the concentrations and pH of the solutions used as well as on the contact time of zeolite-solution system. After 120 min of the reaction, despite the metal type, 90–100% of the total amount of cations were immobilized.
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This work was supported by the State Committee for Scientific Research (KBN) under grant no 3 T08D 039 26.
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Mozgawa, W., Bajda, T. Spectroscopic study of heavy metals sorption on clinoptilolite. Phys Chem Minerals 31, 706–713 (2005). https://doi.org/10.1007/s00269-004-0433-8
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DOI: https://doi.org/10.1007/s00269-004-0433-8