The urgency to address global climate change induced by greenhouse gas emissions is increasing. In particular, the rise in atmospheric CO2 levels is generating alarm. Technologies to remove CO2 from ambient air, or “direct air capture” (DAC), have recently demonstrated that they can contribute to “negative carbon emission.” Recent advances in surface chemistry and material synthesis have resulted in new generations of CO2 sorbents, which may drive the future of DAC and its large-scale deployment. This Review describes major types of sorbents designed to capture CO2 from ambient air and they are categorized by the sorption mechanism: physisorption, chemisorption, and moisture-swing sorption.
Bibliographical noteK.S.L. acknowledges the funding support from Arizona State Univeristy. X.C. acknowledges the support from the Center for Advanced Materials for Energy and Environment. Special thanks go to Mitchell Armstrong for carefully reading the manuscript and providing insightful technical comments.
- atmospheric CO2
- carbon dioxide
- direct air capture