Sustainable Food Waste Management: Synthesizing Engineered Biochar for CO2Capture

Xiangzhou Yuan, Junyao Wang, Shuai Deng, Pavani Dulanja Dissanayake, Shujun Wang, Siming You, Alex C.K. Yip, Shuangjun Li, Yoonah Jeong, Daniel C.W. Tsang, Yong Sik Ok

Research output: Contribution to journalArticlepeer-review

Abstract

Humanity needs innovative ways to combat the environmental burden caused by food waste, which is one of the critical global issues. We proposed food waste-derived engineered biochar (FWDEB) for CO2capture from a life cycle perspective. FWDEB samples were prepared by carbonization and chemical activation for CO2adsorption. FW400-KOH600(2), carbonized at 400 °C and then activated at 600 °C with a KOH/biochar mass ratio of 2, presented the best CO2adsorption capacities of 4.06 mmol g-1at 0 °C (1 bar) and 2.54 mmol g-1at 25 °C (1 bar) among all prepared samples. The CO2uptake at 25 °C (1 bar) was affected by both micropore volume and surface area limited by narrow micropores less than 8 Å. Basic O- and N-functional groups were generated during the KOH activation, which are beneficial for enhancing the FWDEB-based CO2adsorption. Moreover, a life cycle assessment was implemented to quantify the potential environmental impacts of FW400-KOH600(2), indicating that negative net global warming potential could be achieved using the FWDEB-based CO2capture approach. Owing to the environmental benefits, we highlighted its potential as a promising technical route to mitigate climate change and achieve a waste-to-resource strategy.

Original languageEnglish
Pages (from-to)13026-13036
Number of pages11
JournalACS Sustainable Chemistry and Engineering
Volume10
Issue number39
DOIs
Publication statusPublished - 2022 Oct 3

Keywords

  • carbon negative
  • circular economy
  • climate action
  • food waste upcycling
  • low-carbon technology

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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