Tomsk Polytechnic University, Tomsk, Russia:

M. P. Chubik, Assistant Professor (Chair of Geoecology and Geochemistry)
N. A. Osipova, Assistant Professor (Chair of Geoecology and Geochemistry)
A. V. Gonets, Post-Graduate Student (Chair of Geoecology and Geochemistry), e-mail: moskalenkoav@tpu.ru
M. V. Chubik, Assistant Professor, Chair of Biotechnology and Organic Chemistry

There are shown the results of the nano-sized material sorption characteristics research. Nanotubes with layer structure were used for radioactive uranyl-ions UO₂²⁺ sorption from water medium. Nanotubes TiO₂ were obtained by low-temperature fritting of electroblasting nanopowders. Uranyl-ions were sorbed from uranyl nitrate model solutions of required concentrations and a model solution prepared by reaction of natural mineral autenit with twice-distilled water and HNO₃ addition. Research of the UO₂²⁺ sorption were carried out under static and dynamic conditions at the room temperature. The impact of рН on the UO₂²⁺ sorption extent has been studied. Titanium dioxide nanotubes sorption characteristics dependence on mass of sorbent test charge and phases contact time. Analysis of mechanism of UO₂²⁺ absorption and fixation by nanotubes TiO₂ has been accomplished. As a result of immobilization, UO₂²⁺ are sorbed in nanotube which doesn’t require reduction after the sorption. Layer structure of nanotubes becomes significally deformed during sorption. They became fragmented (initial length of nanotubes is 300–600 nm, but after the sorption it comes to 100–130 nm) and unrolled, which increase possibility of radioactive ions capture in the plates of nanotubes. It is shown that titanium dioxide nanotubes with sorption capacity from 36.8 to 92.3% can be used as a very promising material for radioactive water decontamination.

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