Porous Structure and Fractal Dimensions of Activated Carbon Prepared from Waste Coffee Grounds

Overview

Journal Materials (Basel)

Publisher MDPI

Date 2023 Sep 28

PMID 37763406

Authors

Sofiia Victoriia Sklepova

Nataliia Ivanichok

Pavlo Kolkovskyi

Volodymyr Kotsyubynsky

Volodymyra Boychuk

Bogdan Rachiy

Andrzej Uhrynski

Michal Bembenek

Liubomyr Ropyak

Affiliations

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Abstract

The present work reports the results of a systematic study on the evolution of the morphological properties of porous carbons derived from coffee waste using a one-pot potassium-hydroxide-assisted process at temperatures in the range of 400-900 °C. Raw materials and obtained carbons were studied by TG, DTG, SEM and nitrogen adsorption porosimetry. The decomposition temperature ranges for hemicellulose, cellulose and lignin as the main component of the feedstock have been established. It is shown that the proposed method for the thermochemical treatment of coffee waste makes it possible to obtain activated carbon with a controllable pore size distribution and a high specific surface area (up to 1050 m/g). A comparative study of the evolution of the distribution of pore size, pore area and pore volume has been carried out based on the BJH and NL-DFT (slit-like pores approximation) methods. The fractal dimension of the obtained carbons has been calculated by Frenkel-Halsey-Hill method for single-layer and multilayer adsorptions.

Citing Articles

Purification of Biodiesel Polluted by Copper Using an Activated Carbon Prepared from Spent Coffee Grounds: Adsorption Property Tailoring, Batch and Packed-Bed Studies.

Cardenas-Pineros D, Reynel-Avila H, Diaz-Munoz L, Bonilla-Petriciolet A, Duran-Valle C, Adame-Pereira M Molecules. 2025; 30(3).

PMID: 39942589 PMC: 11820585. DOI: 10.3390/molecules30030483.

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