Acid-Base and Photocatalytic Properties of the CeO2-Ag Nanocomposites
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.
March 2023MDPI
Micromachines
2023#14Issue 3
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.
acid-base properties , Ag , CeO2 , nanocomposite , nanoparticles , photocatalytic properties , sol-gel
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Faculty of Physics and Technology, North Caucasus Federal University, 1 Pushkin Str, Stavropol, 355017, Russian Federation
Laboratory of Food and Industrial Biotechnology, Faculty of Food Engineering and Biotechnology, North Caucasus Federal University, 1 Pushkin Str, Stavropol, 355017, Russian Federation
Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
Department of Applied Bioscience, College of Life and Environmental Sciences, Konkuk University, Seoul, 05029, South Korea
Department of Microbiology, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Tamil Nadu, Chennai, 600077, India
Semey Branch of the Institute, Kazakh Research Institute of Processing and Food Industry, 238G Gagarin Ave, Almaty, 050060, Kazakhstan
Faculty of Physics and Technology
Laboratory of Food and Industrial Biotechnology
Department of Botany and Microbiology
Department of Applied Bioscience
Department of Microbiology
Semey Branch of the Institute
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