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- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received January 20, 2025
Revised April 19, 2025
Accepted May 2, 2025
Available online September 25, 2025
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Efficient Removal of Acetaldehyde Using KOH-Activated Adsorbents Derived from Pyrolysis Char of Waste Cigarette Filters
https://doi.org/10.1007/s11814-025-00478-1
Abstract
This study investigates the adsorption performance of activated carbon produced by activating cigarette fi lter pyrolysis char
(CPC), derived from waste cigarette butts, with KOH. Pyrolysis of waste cigarette fi lters was conducted in a lab-scale reactor
at 500 °C, producing gas, oil, and char with yields of 23.0%, 53.3%, and 23.7%, respectively. KOH activation was performed
by mixing CPC with KOH at diff erent ratios (1:1, 1:2, 1:3), followed by heating to 850 °C at a ramp rate of 5 °C/min. With
increasing KOH content, the pore properties of the activated carbons improved signifi cantly, with KOHCPC3 (CPC/KOH:
1:3) exhibiting a remarkable specifi c surface area of 2867 m 2 /g and a pore volume of 0.86 cm 3 /g. XPS analysis revealed
the development of oxygen-containing functional groups due to KOH activation, which contributed to enhanced adsorption
performance. The acetaldehyde adsorption capacity of the activated carbons increased with the KOH ratio, from 3.1 mg/g
for CPC/KOH (1:1) to a maximum of 17.54 mg/g for CPC/KOH (1:3). These fi ndings demonstrate the potential of cigarette
pyrolysis char as a high-performance adsorbent for environmental and industrial applications.
