Gasification biochar from biowaste (food waste and wood waste) for effective CO2 adsorption

Avanthi Deshani Igalavithana, Seung Wan Choi, Pavani Dulanja Dissanayake, Jin Shang, Chi Hwa Wang, Xiao Yang, Sumin Kim, Daniel C.W. Tsang, Ki Bong Lee, Yong Sik Ok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

151 Citations (Scopus)


Biochar is newly proposed as an innovative and cost-effective material to capture CO2. In this study, biochar was produced from feedstock mixtures of food waste and wood waste (i.e., 20%:80% WFW20, 30%:70% WFW30 and 40%:60% WFW40) by gasification. The two biochar adsorbents containing the highest percentage of food waste, i.e., WFW40-K and WFW40-KC, were activated by KOH and KOH + CO2, respectively. The biochar adsorbents were then tested for CO2 adsorption at room temperature of 25 °C by using a volumetric sorption analyzer. The WFW20 showed the highest CO2 adsorption capacity, while higher percentage of food waste in the feedstock was unfavorable for the CO2 adsorption. The presence of N and S on the biochar surface was the primary contributor to the high CO2 uptake on WFW20. The development of micropores by KOH activation significantly increased the CO2 adsorption on WFW40-K, but KOH + CO2 activation could not further increase the development of micropores and subsequent CO2 adsorption. Moreover, WFW40-K showed >99% recyclability during 10 consecutive adsorption-desorption cycles. The biochars derived from biowaste (food waste and wood waste) could be effective adsorbents for CO2 capture by providing green solution for food waste recycling.

Original languageEnglish
Article number121147
JournalJournal of Hazardous Materials
Publication statusPublished - 5 Jun 2020


  • Engineered biochar
  • Negative emission technology
  • Sustainable Development Goals (SDGs)
  • Sustainable waste management
  • Waste recycling/valorization

ASJC Scopus subject areas

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


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