Quasi-isothermal and adsorption characterization of activated carbons

In the presented paper, the structural and energetic heterogeneities of the activated carbons (ACs) surfaces were investigated. The ACs of well-developed microporosity were obtained from the spent coffee grounds as a result of pyrolysis (N.sub.2 or CO.sub.2) with the chemical activation of H.sub.3PO...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2023-07, Vol.148 (14), p.7403
Main Authors: Charmas, Barbara, Ziezio, Magdalena, Jedynak, Katarzyna, Kucio, Karolina
Format: Article
Language:English
Subjects:
Adsorption
Calorimetry
Coffee
Methylene blue
Pyrolysis
Online Access:Get full text
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Summary:In the presented paper, the structural and energetic heterogeneities of the activated carbons (ACs) surfaces were investigated. The ACs of well-developed microporosity were obtained from the spent coffee grounds as a result of pyrolysis (N.sub.2 or CO.sub.2) with the chemical activation of H.sub.3PO.sub.4 (I = 1, 1.5 or 2 w/w). The low-temperature N.sub.2 adsorption, the quasi-isothermal thermogravimetry as well as the low-temperature differential scanning calorimetry were employed. Moreover, the selected materials adsorption properties were studied in relation to methylene blue (MB). The micro/mesoporous structure of the carbons was proved. The different types of water clusters on the surface indicated the carbons surface heterogeneity. The activated carbons are characterized by the high sorption capacity (q.sub.e,exp = 200.3-237.67 mg g.sup.-1) as for MB. The adsorption process was described by means of the Radke-Prausnitz isotherm model. Graphical abstract
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-023-12193-2