Valorization of waste polyethylene terephthalate plastic into N-doped microporous carbon for CO2 capture through a one-pot synthesis

Xiangzhou Yuan, Shuangjun Li, Sunbin Jeon, Shuai Deng, Li Zhao, Ki Bong Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number123010
JournalJournal of hazardous materials
Volume399
DOIs
Publication statusPublished - 2020 Nov 15

Keywords

  • CO adsorption
  • Chemical activation
  • Microporous carbon
  • N-doping treatment
  • Waste PET plastic

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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