Surface chemistry and catalytic activity in H 2 O 2 decomposition of pyrolytically fluoralkylated activated carbons.

Autor: Mussabek G; Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University 050040 Almaty Kazakhstan.; Institute of Information and Computational Technologies 050012 Almaty Kazakhstan., Baktygerey S; Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University 050040 Almaty Kazakhstan.; Institute of Information and Computational Technologies 050012 Almaty Kazakhstan., Taurbayev Y; Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University 050040 Almaty Kazakhstan., Yermukhamed D; Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University 050040 Almaty Kazakhstan.; Institute of Information and Computational Technologies 050012 Almaty Kazakhstan., Zhylkybayeva N; Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University 050040 Almaty Kazakhstan.; Institute of Information and Computational Technologies 050012 Almaty Kazakhstan., Zaderko AN; Light Matter Institute, UMR-5306, Claude Bernard University of Lyon/CNRS, Université de Lyon 69622 Villeurbanne Cedex France., Diyuk VE; Chemical Faculty, Taras Shevchenko National University of Kyiv 01033 Kyiv Ukraine lisnyak@univ.kiev.ua., Afonin S; Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology POB 3640 76021 Karlsruhe Germany., Yar-Mukhamedova G; Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University 050040 Almaty Kazakhstan., Mariychuk RT; Department of Ecology, Faculty of Humanities and Natural Sciences, University of Presov 08001 Presov Slovakia., Grishchenko LM; Chemical Faculty, Taras Shevchenko National University of Kyiv 01033 Kyiv Ukraine lisnyak@univ.kiev.ua., Kaňuchová M; Institute of Earth Resources, Faculty of Mining, Ecology, Process Control and Geotechnology, Technical University of Kosice 042 00 Kosice Slovakia., Lisnyak VV; Nanotechnological Laboratory of Open Type, Al-Farabi Kazakh National University 050040 Almaty Kazakhstan.; Chemical Faculty, Taras Shevchenko National University of Kyiv 01033 Kyiv Ukraine lisnyak@univ.kiev.ua.; Western Caspian University AZ 1001 Baku Republic of Azerbaijan.; Institute of Macromolecular Chemistry, The National Academy of Sciences of Ukraine 02160 Kyiv Ukraine.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2024 Sep 12; Vol. 14 (40), pp. 29052-29071. Date of Electronic Publication: 2024 Sep 12 (Print Publication: 2024).
DOI: 10.1039/d4ra04883k
Abstrakt: 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 19 F 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 H 2 O 2 in methanol solutions.
Competing Interests: There are no conflicts to declare. A. Zaderko is listed as the Fluocar® trademark owner of the US 5,479,088 and Ukraine 213,198 registration.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
Externí odkaz: