Каталазоподібна активність вуглецевих нанотрубок, декорованих нанооксидом церію

• Datum: 2015
• Hauptverfasser: Bortnyk, N. V., Brichka, A. V., Bakalinska, O. M., Brichka, S. Ya., Kartel, M. T.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2015
• Online Zugang: https://surfacezbir.com.ua/index.php/surface/article/view/587
• Назва журналу: Surface

A series of CNT – CeO2 nanocomposites was synthesized by the reaction of cerium nitrate deposition in the aqueous media at room temperature without stabilizers. Amount of СеО2 in the nanoсоmposites varies from 0,66 to 15,29 %. The catalase–mimetic activity of nanoceria, pristine CNT and their nanocomposites was studied in the reaction of hydrogen peroxide decomposition in the pH range of 8 – 11. An extremal dependence of the enzyme-mimetic activity on the pH-value with the pH-optimum at 9.5 – 10.5 was found for nanoceria and nanoceria-containing materials. It was shown that catalytic activity of nanocomposites decreased with the increase of CeO2 content, that can be explained by the agglomeration of the nanoparticles that causes the surface area reduction and the decrease of the surface defects Се3+/Се4+ quantity.