Direct air capture of CO2 by KOH-activated bamboo biochar

Chen Zhang, Shuzhuang Sun, Su He, Chunfei Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
42 Downloads (Pure)


Direct air capture (DAC) of CO2 is considered one of the most promising carbon capture methods to reduce ambient CO2 concentration for climate change mitigation. Biochar represents an attractive adsorbent for DAC because it is environmentally friendly and cost-effective. In this work, KOH-activated bamboo biochar shows the CO2 capture capacity of 3.49 mmol g−1 (25 °C, 1 bar), and it is used as an adsorbent to perform direct air capture using a fixed-bed reactor with an ambient CO2 capture capacity of up to 51.74 μmol g−1. Furthermore, the effect of relative humidity on CO2 adsorption by biochar was investigated and exhibited promising stability under 2.7% relative humidity. However, the biochar activity for CO2 capture is reduced to 63.88% under 67.1% humidity after 50 cycles.

Original languageEnglish
Pages (from-to)399-405
Number of pages7
JournalJournal of the Energy Institute
Early online date03 Nov 2022
Publication statusPublished - 01 Dec 2022

Bibliographical note

Funding Information:
This project was supported by the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 823745 .

Publisher Copyright:
© 2022 The Authors


  • Bamboo
  • Biochar
  • Direct air capture
  • Relative humidity
  • Sorbent stability

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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