A Coffee-Based Bioadsorbent for CO 2 Capture from Flue Gas Using VSA: TG-Vacuum Tests

Marcelina Sołtysik (), Izabela Majchrzak-Kucęba and Dariusz Wawrzyńczak
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Marcelina Sołtysik: Czestochowa University of Technology, Faculty of Infrastructure and Environment, Department of Advanced Energy Technologies, Dabrowskiego Street 73, 42-201 Czestochowa, Poland
Izabela Majchrzak-Kucęba: Czestochowa University of Technology, Faculty of Infrastructure and Environment, Department of Advanced Energy Technologies, Dabrowskiego Street 73, 42-201 Czestochowa, Poland
Dariusz Wawrzyńczak: Czestochowa University of Technology, Faculty of Infrastructure and Environment, Department of Advanced Energy Technologies, Dabrowskiego Street 73, 42-201 Czestochowa, Poland

Energies, 2025, vol. 18, issue 15, 1-23

Abstract: In the energy sector and in other types of industries (cement, iron/steel, chemical and petrochemical), highly roasted coffee ground residue can be used as a source material for producing bioadsorbents suitable for CO 2 capture. In this study, a bioadsorbent was produced in a two-step process involving biowaste carbonization and biocarbon activation within a KOH solution. The physicochemical properties of the bioadsorbent were assessed using LECO, TG, SEM, BET and FT-IR methods. Investigating the CO 2 , O 2 and N 2 equilibrium adsorption capacity using an IGA analyzer allowed us to calculate CO 2 selectivity factors. We assessed the influence of exhaust gas carbon dioxide concentration (16%, 30%, 81.5% and 100% vol.) and adsorption step temperature (25 °C, 50 °C and 75 °C) on the CO 2 adsorption capacity of the bioadsorbent. We also investigated its stability and regenerability in multi-step adsorption–desorption using a TG-Vacuum system, simulating the VSA process and applying different pressures in the regeneration step (30, 60 and 100 mbar abs ). The tests conducted assessed the possibility of using a produced bioadsorbent for capturing CO 2 using the VSA technique.

Keywords: food biowaste; coffee grounds; bioadsorbent; coffee-based adsorbent; activated carbon; adsorption; CO 2 capture; flue gas; VSA (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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