Abstract: Carbonization of Manchurian nut shells (MNS) in argon medium at 400-700°C was studied by electron paramagnetic resonance (EPR) and thermal analysis. Thermal treatment of MNS leads to the formation of radicals stabilized in the solid matrix, the concentration of which decreases with an increase in temperature from 400 to 700°C. Simultaneous increase in EPR signals intensity of paramagnetic species in the structure of carbon materials is observed. Activation of carbonized MNS with CO2 leads to the formation of microporous adsorbent. The texture of adsorbent depends on the concentration of radicals in the carbonization products: radical concentration of 4.2-4.7×1020 spin/g leads to the formation of material with specific surface area (SBET) of 760-800 m2 /g, total pore volume (Vads) of 0.32-0.34 cm3/g and micropore volume (Vmicro) of 0.26-0.27 cm3/g; a decrease in radicals concentration to 0-4×1018 spin/g also reduces SBET to 670-700 m2/g, Vads to 0.28 cm3/g and Vmicro to 0.24 cm3 /g.

Cite: Yurpalov V.L. , Gorbunova O.V. , Vasilevich A.V. , Lavrenov A.V.
Carbonization of Manchurian Nut Shell in the Synthesis of Microporous Carbon-Based Adsorbents: an EPR, Thermal Analysis and Nitrogen Adsorption Study
Chemistry & Biodiversity. 2025. e202500388 :1-10. DOI: 10.1002/cbdv.202500388 WOS Scopus PMID OpenAlex publication_identifier_short.sciact_ihcp_identifier_type

Dates:

Published online:

Apr 9, 2025

Identifiers:

Web of science:	WOS:001472685800001
Scopus:	2-s2.0-105003710505
PMID:	40202071
OpenAlex:	W4409296276
publication_identifier.sciact_ihcp_identifier_type:	4450

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