Titanium – Manganese Oxides. Synthesis,

Category: Ukrainean-polish sympozium

TITANIUM – MANGANESE OXIDES. SYNTHESIS,

PROPERTIES AND EMPLOYMENT

O. I. Pendelyuk, E. Y. Markiv, V. V. Shimanovskaya,

T. V. Lesnichaya, V. V. Strelko

Institute for Sorption & Endoecology Problems National Academy of Sciences of Ukraine, 13 General Naumov street, 03680 Kyiv-164, Ukraine

The Sr and U long time existing radioisotopes are one of the base environment pollutions after Chernobyl accident. That is why the excited interest display to the synthesis and investigations of the selective sorbents about this radioactivity elements.

In the present work are offered the results of inorganic ionites synthesis and investigations, based of the Ti and Mn hydrate oxides, with the common formula mTiO2.nMnO2. The binary Ti – Mn oxides synthesis we carried out by means of alkali presipitation from the aqueous Mn (II) and Ti (IV) salt solutions in the hydrogen peroxide presence.

It have been found, that synthesied composition materials own the large specific surface, about 50-400 m2/g. The manganese dioxide contents in the samples correlates with the specific surface and amounts to maximum with 50% MnO2 correlation in the binary mixture. The influence of the different factors: the acidity and solutions temperature, the ion concentrations, the processing temperature for the Sr absorption efficient have been investigated. The value of the Sr distribution coefficients amounts to 46.000. It have been founded, the background electrolyte concentration is not exert essential influence on the strontium extraction efficient.

The comparative investigation of the amorphous binary oxides and MnO2 sorption properties as regards to U (VI) ions have been carried out. It was shown that Ti – Mn oxides with the manganese oxide great contents as well as MnO2 display the higher affinity to the U (VI) ions and Kd make up 5.500 – 10.000. The Ti – Mn sorbents test on the Chernobyl EPS blok waters showed that Sr90 and U235 radionucleads concentration in the real solutions decreased in 10 – 15 time after sorption.



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