Composition of Chemical Elements and Ion Exchange Complex of Acid- and Alkali-Modified Natural Zeolites From the Sokyrnytsky Deposit

Natural zeolites are abundant and inexpensive resources. They crystalline hydrated aluminosilicates with a framework structure that has pores channels occupied by water, alkali, alkaline earth cations. Having high cation exchange capacity, acting as molecular sieve, natural have been widely utilized in recent decades adsorbents separation purification processes. Modification of zeolite increases its adsorption capacity environmental pollutants, particular, radionuclides from low-level liquid radioactive waste. The article presents results obtained study the chemical composition structural elements ion complexes natural, acid-modified alkali-modified Sokyrnytske deposit. main rock-forming mineral is clinoptilolite. was modified 5.5 M HCl solution for 2 hours at 100 oC using backflow condenser. ratio solid to phases 1:2. For modification, 1.4 NaOH used. exposure time 2.75 hours. conditions phase were similar those acidity modification. By complex, belongs potassium-calcium-sodium (K > Ca Na) clinoptilolites. In process modification zeolite, redistribution exchangeable cations observed content clinoptilolite lattice changes. Na increases, K Al decreases. number Na, Mg, Ca, At same time, Fe decreases relative amount Si increases. Si/Al following succession: → zeolite. specific surface area compared ones. largest increase textural characteristics studied samples indicate deposit may be used removal