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Surface chemistry of fluoroalkylated nanoporous activated carbons: XPS and 19F NMR study

In this study, we considered changes in the surface chemistry after introducing fluorine into the surface layer of nanoporous activated carbon (BAU) produced from the birch wood. Here, we examined the BAU treated with 1,1,1,2-tetrafluoroethane at the selected temperature in the range of 400–800 °C....

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Published in:Applied nanoscience 2022, Vol.12 (3), p.637-650
Main Authors: Diyuk, Vitaliy E., Zaderko, Alexander N., Grishchenko, Liudmyla M., Afonin, Sergii, Mariychuk, Ruslan, Boldyrieva, Olga Yu, Skryshevsky, Valeriy A., Kaňuchová, Mária, Lisnyak, Vladyslav V.
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Language:English
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Summary:In this study, we considered changes in the surface chemistry after introducing fluorine into the surface layer of nanoporous activated carbon (BAU) produced from the birch wood. Here, we examined the BAU treated with 1,1,1,2-tetrafluoroethane at the selected temperature in the range of 400–800 °C. Diverse methods, including chemical analysis, nitrogen adsorption–desorption, SEM–EDS, XPS, and 19 F solid-state NMR, were used for the characterization of the prepared materials. It was found that one can introduce from 0.17 to 0.42 mmol of F per gram of BAU using fluoroalkylation at 400–500 °C. Increasing the temperature to 600 °C increases the fluorination efficiency, and the relatively high fluorine content of 1.86 mmol of F per gram of BAU can be reached. At least three group types, namely, C–F, CF 2 , and CF 3 groups, were found by XPS and 19 F solid-state NMR after such treatment. The content of “semi-ionic” fluorine drastically increases in the surface layer after high-temperature fluoroalkylation at 700 °C and 800 °C. This “semi-ionic” fluorine, in the form of C–F and CF 2 groups, is directly conjugated with the π-electron system of the carbon matrix.
ISSN:2190-5509
2190-5517
DOI:10.1007/s13204-021-01717-7