Sorption of tungsten (VI) ions on zeolite-bearing tuffs of deposits in Transbaikalia
Abstract
In this study, we investigated the sorption of W(VI) ions on natural zeolite-containing tuffs using modern methods of analysis, including an ARL Perform'X crystal diffraction spectrometer, an Optima-2000 DV atomic emission spectrometer with ICP (analysis of tungsten in zeolite-containing tuffs and solutions), PinAAcle 900 F, UNICO 1201 spectrometers (silicate rock analysis), Termo Scientific Nikolet 6700 IR Fourier spectrometer, LEO 1430VP scanning electron microscope with INCA Energy 350 energy dispersive spectrometer. The purpose of this study was to determine the sorption capacity of natural zeolites in relation to W(VI) ions from aqueous solutions. The high sorption capacity of zeolite-containing tuffs from two deposits in Transbaikalia (Russia) at pH~8 has been revealed. Based on the data of IR spectroscopy and electron microscopy, it was suggested that the sorption of W(VI) ions on zeolite-containing tuffs under neutral-alkaline conditions proceeds by the mechanism of ion exchange of calcium for sodium and subsequent physical sorption on their surface. Thus, zeolite-containing tuffs can be used in the purification of industrial solutions and effluents under neutral-alkaline environmental conditions.
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