SYNTHESIS AND CHARACTERIZATION OF ION EXCHANGE PROPERTIES OF SPHERICALLY GRANULATED TITANIUM PHOSPHATE
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Spherically granulated titanium phosphate of formula TiO1.25(OH)0.47(H2PO4) 0.77(HPO4)0.13·2.3H2O (THP) was synthesized by a gel method. The material was characterized by chemical analysis, X-ray diffraction, TGA and 31P MAS NMR spectroscopy methods. Ion exchange of alkali, alkaline earth and some other di- and trivalent metal cations by THP was studied in both batch and column conditions. It was found that THP is a weak acid cation exchanger with a maximum ion exchange capacity 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 cations 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 form adsorbs up to 1 meq/g of d-metals in the presence of 3 M alkali metal nitrates and shows Kd > 103 - 104 ml/g. Thus spherically granulated titanium phosphate can be recommended for separation and selective recovery of toxic or valuable cations from complex solutions (wastes, technological solutions, reagents purification, etc.).
author list (cited authors)
Bortun, A. I., Bortun, L. N., Clearfield, A., Khainakov, S. A., Strelko, V. V., Khryashevskii, V. N., Kvashenko, A. P., & Voitko, I. I.