Low-cost activated carbon from the pyrolysis of post-consumer plastic waste and the application in CO2 capture
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Chemical recycling by pyrolysis of plastic waste has been considered a potential approach. However, little attention has been paid to the reuse of the char residue generated. The preparation of materials from char residue obtained from the pyrolysis process has become an essential task. The purpose of this work is the preparation of activated carbons from the resulting char from the pyrolysis of a dirty and wet mixture of post-consumer plastic waste. The porous materials have been applied to the adsorption of CO2. Both physical and chemical activation methods were investigated to modify the surface texture properties. The properties of the developed activated carbons were characterized by diverse techniques such as elemental and proximate analysis, Fourier Transform Infrared Spectroscopy (FTIR), adsorption-desorption isotherms with N2, and Scanning Electron Microscopy (SEM). Among all synthesized samples, the activated samples prepared by chemical activation with KOH (char: KOH ratio 2:1; surface area, 487.0 m2·g−1) exhibited the highest CO2 adsorption uptake (∼49 mg·g−1). The activation temperature was explored within 680–840 ºC. For physical activation, an increase in the activation temperature decreases the adsorption uptake of the samples. For chemical activation, the adsorption increased as activating temperature rise to a maximum value, subsequently decreasing with further temperature rise. Increasing the amount of the chemical activating agent significantly decreases the adsorption capacities. The best-activated carbon was chosen, and several parameters were investigated on CO2 adsorption, C: KOH mass ratio (6:1–1:4), and adsorption temperature (15–60 °C). The highest adsorption of CO2 achieved was 62.0 mg·g−1 for activated carbon operating at the lower adsorption temperature (15 ºC).
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Ligero et al. found that chemical activation of waste-plastic-derived char at 760 °C (KOH) or 800 °C (NaOH) formed a well-developed microporous structure with specific surface area up to 487 m2/g, surpassing physical activation at 720 °C; with a char-to-KOH mass ratio of 2:1, the activated carbon had a CO2 adsorption capacity of 62.0 mg/g at 15 °C.
“The results of the study demonstrated that chemical activation at 760 °C (for KOH) or 800 °C (for NaOH) resulted in the formation of a well-developed microporous structure (specific surface area up to 487 m 2 /g), whose performance significantly surpassed that of products from physical activation at a peak temperature of 720 °C.Further investigation revealed that when the char-to-KOH mass ratio”
From Functional carbon materials from waste plastics: synthesis and applications (2025) · cites this paper as [59]
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Recent Developments in Polymeric Adsorbents for CO 2 Capture
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Ethylparaben removal using chitin carbons derived from Hermetia illucens pupa casings
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Recycling PVC Waste into CO2 Adsorbents: Optimizing Pyrolysis Valorization with Neuro-Fuzzy Models
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Self-citationAn Attempt to Produce Pyro-Fuels from Indian Railways’ Mixed Single-Use-Plastic Waste
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- Authors
- Ligero, A., Calero, M., Pérez, A., Solís, R. R., Muñoz-Batista, M. J., & Martín-Lara, M. Á.
- Affiliations
- Universidad de Granada (ES)
- Corresponding author
- Calero, Mónica
- Pérez, Antonio
- Venue
- Process Safety and Environmental Protection
- Publisher
- Elsevier BV
- Published
- 2023-05
- Volume
- 173
- Pages
- 558-566
- ISSN
- 0263-8762 (ISSN-L)
- 0957-5820
- OpenAlex
- W4327703604
- Cited by
- 89
- References
- 42
- Citations by year
- 2026: 20 · 2025: 29 · 2024: 29 · 2023: 11
- FWCI
- 8.77
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Process Safety and Environmental Protection (publishedVersion, cc-by-nc-nd)
- Institutional Repository of the University of Granada (University of Granada) (submittedVersion, cc-by-nc-nd)
- Funders
- Universidad de Málaga
- Consejería de Transformación Económica, Industria, Conocimiento y Universidades
- Universidad de Granada
- Junta de Andalucía (UGR20, B-RNM-78-UGR20)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Carbon Dioxide Capture Technologies
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Keywords
- activated carbon, post-consumer plastic waste, pyrolysis, char residue, CO2 capture, CO2 adsorption, chemical activation, KOH activation, physical activation, low-cost adsorbent, chemical recycling, porous media
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