Role of carbon material surface functional groups on their interactions with aqueous solutions
Atchabarova A.A. Abdimomyn S.K. Abduakhytova D.A. Zhigalenok Y.R. Tokpayev R.R. Kishibayev K.K. Khavaza T.N. Kurbatov A.P. Zlobina Y.V. Djenizian T.J.
1 October 2022Elsevier B.V.
Journal of Electroanalytical Chemistry
2022#922
In this work, the fundamental study of the surface functional groups role of the carbon material based on walnut shells in water solutions was studied. Functional groups (FG) were evaluated by Boehms titration method, electrochemical impedance spectroscopy, spectrophotometric method, etc. The surface oxygen-containing functional groups (OCFG) was determined quantitatively by Boehm method: C(-C-OH) = 1.15 mmol/g; C(-C[dbnd]O) = 0.87 mmol/g; C(–COOH) = 6.31 mmol/g. By the method of edge angle wetting the influence of OCFG on the formation of a hydrophilic functional layer on the surface of carbon material at different electrolyte media and adhesion works were found. The results of ζ-potential measurements as a function of solution pH allowed us to characterize the surface redox (acid-base) centers of the carbon material. Electrochemical impedance spectroscopy results show that surface OCFGs have a large influence on carbon material capacity characteristics.
Activated carbon , Carbon material , Functional groups , Hydrothermal carbonization , Thermal carbonization , Walnut shell
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Center of Physical Chemical Methods of Research and Analysis, Al-Farabi, Kazakh National University, Almaty, Kazakhstan
École Nationale Supérieure des Mines de Saint-Étienne, Saint-Etienne, France
Center of Physical Chemical Methods of Research and Analysis
École Nationale Supérieure des Mines de Saint-Étienne
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