Abstract
This study presents a novel approach for effectively removing amoxicillin (AMX) from waste coffee grounds (CGs) using eco-friendly activated biochar-based adsorbents. To avoid the use of toxic chemicals, the adsorbents, called ACGs (activated CGs), were prepared by a water washing method followed by KOH activation. The adsorption performance of the ACGs was evaluated using various parameters such as the Freundlich isotherm, Langmuir isotherm, adsorption density, and pseudo-second-order equation to determine their maximum adsorption capacity and kinetics. Among the ACGs tested, ACG-4a, activated with KOH after water washing, exhibited significantly higher adsorption capacity (740.7 mg/g) compared to ACG-4b, activated with KOH after NaOH washing (549.5 mg/g). The superior adsorption capacity of ACG-4a can be attributed to its specific surface area. Notably, the ACGs demonstrated the highest AMX-adsorbing capacity when compared to other adsorbents.
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This study was funded by the National Research Foundation of Korea (grant number: NRF-2022R1F1A1059495).
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Lee, M.G., Kim, Y. Enhanced antibiotic removal by waste coffee grounds prepared via water washing and KOH activation. Korean J. Chem. Eng. 40, 2489–2496 (2023). https://doi.org/10.1007/s11814-023-1550-8
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DOI: https://doi.org/10.1007/s11814-023-1550-8