Surface chemistry and catalytic activity in H2O2 decomposition of pyrolytically fluoralkylated activated carbons
Mussabek G. Baktygerey S. Taurbayev Y. Yermukhamed D. Zhylkybayeva N. Zaderko A.N. Diyuk V.E. Afonin S. Yar-Mukhamedova G. Mariychuk R.T. Grishchenko L.M. Kaňuchová M. Lisnyak V.V.
12 September 2024Royal Society of Chemistry
RSC Advances
2024#14Issue 4029052 - 29071 pp.
According to the proposed pyrolytic method, granular activated carbon (AC) Norit 830 W was functionalized by thermal treatment of AC in hydrofluorocarbon (HFC) gases, pentafluoroethane and 1,1,1,2-tetrafluoroethane, at 400-800 °C. This method does not require activation by plasma and photons. Chemical and elemental analysis showed that the pyrolytic treatment provides a loading of 2.95 mmol (5.6 wt%) of fluorine per gram of AC. Nitrogen adsorption measurements indicated that the microporous structure contracted when AC was treated with HFC at temperatures above 400 °C. Thermogravimetry, Fourier transform infrared spectroscopy (FTIR) with attenuated total reflectance (ATR), and X-ray photoelectron spectroscopy (XPS) demonstrated the evolution of oxygen-containing and fluorine-containing groups to more thermostable groups with treatment temperature. The fluorine-containing groups grafted at high temperature, above 600 °C exhibited the highest thermal stability up to 1250 °C in dry argon. From the data of XPS and solid-state 19F nuclear magnetic resonance spectroscopy data, the grafted fluorine exists in several types of grafted F-containing groups, the HFC residues. By changing the thermal regime of fluorination, the composition of fluorine-containing groups on a carbon surface can be regulated. Isolated fluoroalkyl groups can be grafted at temperatures of 400-500 °C, while at 600 °C and above, the semi-ionic fluorine groups increase significantly. The hydrophobized surface demonstrated the ability to effectively decompose H2O2 in methanol solutions.
Text of the article Перейти на текст статьи
Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Institute of Information and Computational Technologies, Almaty, 050012, Kazakhstan
Light Matter Institute, UMR-5306, Claude Bernard University of Lyon, CNRS, Université de Lyon, Cedex, Villeurbanne, 69622, France
Chemical Faculty, Taras Shevchenko National University of Kyiv, Kyiv, 01033, Ukraine
Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, POB 3640, Karlsruhe, 76021, Germany
Department of Ecology, Faculty of Humanities and Natural Sciences, University of Presov, Presov, 08001, Slovakia
Institute of Earth Resources, Faculty of Mining, Ecology, Process Control and Geotechnology, Technical University of Kosice, Kosice, 042, Slovakia
Western Caspian University, Baku, AZ1001, Azerbaijan
Institute of Macromolecular Chemistry, The National Academy of Sciences of Ukraine, Kyiv, 02160, Ukraine
Nanotechnological Laboratory of Open Type
Institute of Information and Computational Technologies
Light Matter Institute
Chemical Faculty
Institute of Biological Interfaces (IBG-2)
Department of Ecology
Institute of Earth Resources
Western Caspian University
Institute of Macromolecular Chemistry
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026