Study Of Ion-exchange Properties Of Clinoptilolite, Modified By Titanium Phosphates

Category: VI Ukrainian-Polish Symposium

STUDY OF ION-EXCHANGE PROPERTIES OF CLINOPTILOLITE, MODIFIED BY TITANIUM PHOSPHATES

V.S. Alexandrova, E.Ya. Markiv

Institute for Sorption and Endoecology Problems, Ukrainian National Academy of Sciences, General Naumov st. 13, 03680 Kyiv-164, Ukraine

Due to selectivity towards heavy and transition metal ions a natural zeolite – clinoptilolite is perspective adsorbent in water management. However in practice in most cases zeolite is seldom used in its natural form and, as a rule, is additionally treated to increase the ion-exchange properties.

To improve sorption properties Transcarpathian clinoptilolitic materials (v. Sokyrnytsa) have been modified by titanium phosphate, which is well known due to its high sorption and selective properties.

The comparative analysis of breakthrough curves of copper, lead and cadmium adsorption from model solution prepared on drinking water with the initial heavy metal ions concentration 1-2 mg/dm3 showed, that the extraction degree is 2-2,5 times more than that on a natural material.

On the basis of comparison clinoptilolite and its modified form (clinoptilolite-M) IR spectra (Fig. l and 2) the – conclusion about a chemical

inoculation of titanium hydroxophosphate to an initial zeolite surface by OH-groups with its basic character (Fig.l, high-frequency component of OH group absorption band) has been made. It is accompanied by increase of Al(Si)-O bond covalent component and has shown itself as high-frequency tail intensity growth of a zeolitic skeleton normal absorption band (Fig.2, curve 3). Low-frequency maximum corresponds to absorption of the modifier. A newly added hydroxophosphatic OH – groups on modified clinoptilolite (Fig. 1, low-frequency tail of OH group absorption band), having protonogenic properties, cause improvement sorptional characteristics of a new material.

From the above and based on ESCA data (Ti:P = 1:1,1-1,3) and reference [1], the scheme of natural zeolite interaction with the modifier is proposed:

References

1. Sharygin L.M., Vovk S.M., Gonchar V.F.// Journal of Inorganic Chemistry, v.33, N7, 1988, p.1706-1712 (in Russian).



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