Thermodynamic characteristic of nanocarbon adsorbents from the high-moor peat of the European North of Russia

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Abstract

By thermochemical activation with NaOH from the high-moor peat of the European North Russia, activated nano-carbons were obtained with a pore surface area of 2335 m²/g and a total pore volume of 1.44 cm³/g, with predominance of micropores. One of the designs of the adsorption-thermodynamic approach in the evaluation of thermodynamic functions was considered. Based on the experimental data of adsorption of standard marker-adsorbent – liquid nitrogen on active coals by means of isotherm equations of differential isosterial adsorption heat obtained from known adsorption model approximations (Langmuir, Brunauer–Emmett–Tellier, Aranovich), a non-traditional algorithm for calculating differential thermodynamic functions (enthalpy, entropy, free energy) on the single adsorption isotherm was proposed.

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About the authors

N. A. Makarevich

Educational institution “Military Academy of Belarus”; Northern (Arctic) Federal University named after M. V. Lomonosov

Author for correspondence.
Email: nikma@tut.by
Belarus, 220000 Minsk; 163002 Arkhangelsk, Russia

I. N. Zubov

Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences

Email: zubov.ivan@fciarctic.ru
Russian Federation, 163002 Arkhangelsk

Y. A. Savrasova

Northern (Arctic) Federal University named after M. V. Lomonosov

Email: yulia925@mail.ru
Russian Federation, 163002 Arkhangelsk

N. I. Bogdanovich

Northern (Arctic) Federal University named after M. V. Lomonosov

Email: n.bogdanovich@narfu.ru
Russian Federation, 163002 Arkhangelsk

S. I. Tretyakov

Northern (Arctic) Federal University named after M. V. Lomonosov

Email: s.tretiakov@narfu.ru
Russian Federation, 163002 Arkhangelsk

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Supplementary files

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2. Fig. 1. Experimental isotherms of N2 adsorption on peat (a), on AC (b).

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3. Fig. 2. Experimental isotherms normalized by adsorption θ = a/am and by pressure P = p/ps, in the L, BET, Ar models on AC (see Table 3 for am values).

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4. Fig. 3. Isotherms of differential thermodynamic characteristics of N2 adsorption on the original peat (a) on AC (b).

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