Affiliation:
1. Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA 18015, USA.
2. Georgia Tech Shenzhen Institute (GTSI), Tianjin University, Shenzhen 518067, China.
Abstract
Direct air capture (DAC) is important for achieving net-zero greenhouse gas emissions by 2050. However, the ultradilute atmospheric CO
2
concentration (~400 parts per million) poses a formidable hurdle for high CO
2
capture capacities using sorption-desorption processes. Here, we present a Lewis acid-base interaction–derived hybrid sorbent with polyamine-Cu(II) complex enabling over 5.0 mol of CO
2
capture/kg sorbent, nearly two to three times greater capacity than most of the DAC sorbents reported to date. The hybrid sorbent, such as other amine-based sorbents, is amenable to thermal desorption at less than 90°C. In addition, seawater was validated as a viable regenerant, and the desorbed CO
2
is simultaneously sequestered as innocuous, chemically stable alkalinity (NaHCO
3
). The dual-mode regeneration offers unique flexibility and facilitates using oceans as decarbonizing sinks to widen DAC application opportunities.
Publisher
American Association for the Advancement of Science (AAAS)
Cited by
16 articles.
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