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Title: Acid-Base and Photocatalytic Properties of the CeO2-Ag Nanocomposites
Authors: Kravtsov, A. A.
Кравцов, А. А.
Blinov, A. V.
Блинов, А. В.
Nagdalian, A. A.
Нагдалян, А. А.
Gvozdenko, A. A.
Гвозденко, А. А.
Golik, A. B.
Голик, А. Б.
Pirogov, M. A.
Пирогов, М. А.
Kolodkin, M. A.
Колодкин, М. А.
Keywords: CeO2;Photocatalytic properties;Nanoparticles;Nanocomposite;Sol-gel;Acid-base properties;Ag
Issue Date: 2023
Citation: Kravtsov, A.A., Blinov, A.V., Nagdalian, A.A., Gvozdenko, A.A., Golik, A.B., Pirogov, M.A., Kolodkin, M.A., Alharbi, N.S., Kadaikunnan, S., Thiruvengadam, M., Shariati, M.A. Acid-Base and Photocatalytic Properties of the CeO2-Ag Nanocomposites // Micromachines. - 2023. - 14(3), 694. - DOI: 10.3390/mi14030694
Series/Report no.: Micromachines
Abstract: In this work, CeO2 nanoparticles, as well as CeO2 nanocomposites with plasmonic silver nanoparticles, were synthesized using a simple sol-gel process. The concentration of silver in the composites varied from 0.031–0.25 wt%. Cerium hydroxide dried gel was calcined at temperatures from 125 to 800 ◦C to obtain CeO2. It was shown that, at an annealing temperature of 650 ◦C, single- phase CeO2 nanopowders with an average particle size in the range of 10–20 nm can be obtained. The study of acid-base properties showed that with an increase in the calcination temperature from 500 to 650 ◦C, the concentration of active centers with pKa 9.4 and 6.4 sharply increases. An analysis of the acid-base properties of CeO2-Ag nanocomposites showed that with an increase in the silver concentration, the concentration of centers with pKa 4.1 decreases, and the number of active centers with pKa 7.4 increases. In a model experiment on dye photodegradation, it was shown that the resulting CeO2 and CeO2-Ag nanopowders have photocatalytic activity. CeO2-Ag nanocomposites, regardless of the silver concentration, demonstrated better photocatalytic activity than pure nanosized CeO2.
Appears in Collections:Статьи, проиндексированные в SCOPUS, WOS

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