SYNTHESIS AND CHARACTERIZATION OF ION-EXCHANGE PROPERTIES OF SPHERICALLY GRANULATED TITANIUM PHOSPHATE

Spherically granulated titanium phosphate of formula TiO1.25(OH)(0.47) (H2PO4)(0.77)(HPO4)(0.13). 2.3H(2)O (THP) was synthesized by a gel met hod. The material was characterized by chemical analysis, X-ray diffra ction, TGA and P-31 MAS NMR spectroscopy methods. Ion exchange of alka li, alkaline earth and some other di- and trivalent metal cations by T HP was studied in both batch and column conditions. It was found that THP is a weak acid cation exchanger with a maximum ion exchange capaci ty of 4.7 meq/g. It exhibits a high affinity for heavy metal cations ( Pb2+, Cr3+, Ba2+, Cs+). Exchange of micro amounts of some polyvalent c ations was studied on salt forms (Na, K) of THP. It was shown that the conversion of the exchanger into the salt form enhances significantly its ion exchange performance for transition and heavy metal cations. THP converted into Na+ or K+ ion Corm adsorbs up to 1 meq/g of d-metal s in the presence of 3 (M) under bar alkali metal nitrates and shows K -d > 10(3) - 10(4) ml/g. Thus spherically granulated titanium phosphat e can be recommended for separation and selective recovery of toxic or valuable cations from complex solutions (wastes, technological soluti ons, reagents purification.