The effect of the content of natural and anthropogenic pollutants (potentially acidic organic substances, synthetic surfactants and petroleum products in water, which is exposed to desalting) on the efficiency of КU-2-8 ion exchangers has been studied. To minimize this negative influence the reagent method was used. Different natural and modified sorbents have been investigated for additional purification of water before filtration on cation-exchange filters or periodic regeneration of ion exchangers by the studied reagents.

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Abstract19F NMR spectroscopy, X‐ray powder diffraction, elemental analysis, and ab initio quantum chemical calculations were used to study metathetical reactions between potassium or sodium hexafluorophosphate and lithium tetrafluoroborate in a mixture of propylene carbonate (PC) – dimethyl carbonate (DMC). It was shown that the increase in size of the cations in the second coordination sphere from Na+ to K+ results in an increase of the equilibrium conversion. This is in agreement with the influence of the cation size on the solubility of tetrafluoroborates in the media investigated.

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