Valorization of waste polyethylene terephthalate (PET) plastic into microporous carbon with N-doping treatment was successfully performed in a one-pot synthesis and the N-doped microporous carbon was used for CO2 capture, which can mitigate plastic pollution and climate change simultaneously. The PET-derived microporous carbon developed by KOH activation and urea treatment in a one-pot synthesis at 700 °C exhibited the highest CO2 adsorption uptake of 6.23 mmol g−1 at 0 °C and 4.58 mmol g−1 at 25 °C (1 atm). The Langmuir and pseudo second-order models displayed well-fitting relationships with equilibrium and kinetic experimental data obtained in this study. The N-doped microporous carbon showed high CO2 selectivity over N2, implying that it is feasible for treating flue gases (10% CO2 and 90% N2) at 50 °C. In addition, the CO2 uptake was not only affected by micropores but also related with nitrogen and oxygen functional groups. Compared to the porous carbon prepared by two-pot synthesis where KOH activation and urea treatment were conducted separately, the porous carbon prepared by one-pot synthesis had higher oxygen contents and higher CO2 adsorption uptake. All of findings implied that the N-doped microporous carbon was successfully developed from waste PET plastic for capturing CO2 and can play a promising role in both sustainable waste management and environmental protection.
Bibliographical noteFunding Information:
This research was supported by the National Research Foundation of Korea (NRF), South Korea through the Basic Science Research Program (NRF-2020R1A2C2010815) and the Korea-China Joint Research Program (NRF-2018K1A3A1A20025653) funded by the Korean government's Ministry of Science and ICT.
This research was supported by the National Research Foundation of Korea (NRF) , South Korea through the Basic Science Research Program ( NRF-2020R1A2C2010815 ) and the Korea-China Joint Research Program ( NRF-2018K1A3A1A20025653 ) funded by the Korean government’s Ministry of Science and ICT .
© 2020 Elsevier B.V.
Copyright 2020 Elsevier B.V., All rights reserved.
- CO adsorption
- Chemical activation
- Microporous carbon
- N-doping treatment
- Waste PET plastic
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Health, Toxicology and Mutagenesis