PREPARATION OF CERIA PARTICLES AND THEIR ANTIOXIDANT ACTIVITY
Abstract
Ceria particles were synthesized in the aqueous ammonia solution in presence of hydrogen peroxide or sodium citrate. The obtained sols were exposed at room temperature for 6 hours, thеn treated with ultrasound or heated under pressure (~80 kPa). After sonication the absorption intensity of the particles increased by 3.4–3.7 times, as compared to the particles aged at room temperature or heated under pressure. Addition of H2O2 or Na3C6H5O7 in the synthesis medium leads to the reduction of hydrodynamic diameter of particles (116–216 nm) and polydispersity index of the sol (0,18–0,27). The resulting ceria particles are able to oxidize 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) and decompose H2O2. The highest «oxidase» activity showed the particles treated with ultrasound. Their «catalase» activity decreases with the increase of H2O2 concentration.
About the Authors
A. V. Abakshonok
Institute of Chemistry of New Materials of the National Academy of Sciences of Belarus
Belarus
Belarus
M. Sc. (Chemistry), Junior Researcher
A. A. Kvasyuk
Institute of Chemistry of New Materials of the National Academy of Sciences of Belarus
Belarus
Belarus
Junior Researcher
A. N. Eryomin
Institute of Chemistry of New Materials of the National Academy of Sciences of Belarus
Belarus
Belarus
D. Sc. (Chemistry), Chief Researcher
V. E. Agabekov
Institute of Chemistry of New Materials of the National Academy of Sciences of Belarus
Belarus
Belarus
Academician, D. Sc. (Che mist-ry), Professor, Director
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