SYNTHESIS AND ION EXCHANGE PROPERTIES OF NOVEL INORGANIC ADSORBENTS TINaV)-NITRILOTRIS(METHYLENE)TRIPHOSPHONATES
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Several new tin(IV) nitrilotris(methylene)triphosphonates of different composition have been synthesized by the reaction of a tin tetrachloride and nitrilotris(methylene)triphosphonic acid [N(CH2PO(O)OH)3] and a gel method of their preparation in granular form (as spherical beads) was developed. The solids were characterized by elemental analysis, TGA, FT-IR, MAS 31P NMR and X-ray spectroscopy. The ion exchange behavior of tin(IV) nitrilotris(methylene)triphosphonates towards alkali, alkaline earth and some transition metal ions in individual and complex solutions were studied. It was found that these exchangers contain highly acidic adsorption sites, which enables them to operate efficiently even at pH close to 0. High affinity of the tin(IV) nitrilotris(methylene)triphosphonates for lead, cadmium, copper in acid solutions makes them promising for treatment of some technological solutions and waste.
author list (cited authors)
Bortun, A. I., Bortun, L. N., Clearfield, A., Khainakov, S. A., & García, J. R.