Abstract
The adsorption of aniline from aqueous solution on carbon sorbents is investigated. The sorbents are derived from D and G Kuznetsk Basin coal by chemical activation using potassium hydroxide at 800°C, when the coal/alkali ratio (by mass) is 1.0 : 0.5 and 1.0 : 1.0. The sorbents consist mainly of micropores, and their specific surface is relatively high (700–1340 m2/g). The experimental adsorption isotherms are plotted. On that basis, the parameters of the Langmuir, Freundlich, Dubinin–Astakhov, and BET sorption models are calculated. The models are appropriate for the description of aniline adsorption (R2 > 0.9). The Langmuir model is the most accurate. The state parameters indicate that the adsorption of aniline by this means is very effective. The process may be described as monomolecular adsorption on the surface of microporous sorbents. The thermomechanical characteristics of the adsorption process are low. That indicates physical adsorption.
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ACKNOWLEDGMENTS
We thank O.S. Efimova for the elemental analysis; and Yu.N. Dudnikova for determining the textural characteristics of the sorbents.
This research was conducted on equipment at the Collective Use Center, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences.
Funding
Financial support was provided by the Russian Science Foundation within the framework of state support for the Institute of Coal Chemistry and Materials Science, Federal Research Center of Coal and Coal Chemistry, Siberian Branch, Russian Academy of Sciences (project 121031500194-5).
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Zykov, I.Y., Fedorova, N.I., Tsvetkov, V.E. et al. Chemically Activated Carbon for the Adsorption of Aniline from Water. Coke Chem. 66, 511–517 (2023). https://doi.org/10.3103/S1068364X2370117X
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DOI: https://doi.org/10.3103/S1068364X2370117X