SYNTHESIS AND ION-EXCHANGE PROPERTIES OF NOVEL INORGANIC ADSORBENTS TIN(IV)-NITRILOTRIS(METHYLENE)TRIPHOSPHONATES

Several new tin(IV) nitrilotris(methylene)triphosphonates of different composition have been synthesized by the reaction of a tin tetrachlor ide and nitrilotris(methylene)triphosphonic acid [N(CH2O(O)OH)(3)] and a gel method of their preparation in granular form (as spherical bead s) was developed. The solids were characterized by elemental analysis, TGA, FT-IR, MAS P-31 NMR and X-ray spectroscopy. The ion exchange beh avior of tin(IV) nitrilotris(methylene)triphosphonates towards alkali, alkaline earth and some transition metal ions in individual and compl ex solutions were studied. It was found that these exchangers contain highly acidic adsorption sites, which enables them to operate efficien tly even at pH close to 0. High affinity of the tin(IV) nitrilotris(me thylene)triphosphonates for lead, cadmium, copper in acid solutions ma kes them promising for treatment of some technological solutions and w aste.