AI Article Synopsis
- A humidity-swing polymeric sorbent can capture CO2 from the air at room temperature by altering humidity levels.
- This study uses solid-state NMR to investigate the chemical mechanisms behind this absorption and desorption process.
- Findings reveal that at low humidity, CO2 is stored as bicarbonate (HCO3-), while at high humidity, it is released by substituting HCO3- with hydrated hydroxide (OH-).
Article Abstract
A humidity-swing polymeric sorbent captures CO2 from ambient air at room temperature simply by changing the humidity level. To date there has been no direct experimental evidence to characterize the chemical mechanism for this process. In this report we describe the use of solid-state NMR to study the humidity-swing CO2 absorption/desorption cycle directly. We find that at low humidity levels CO2 is absorbed as HCO3-. At high humidity levels, HCO3- is replaced by hydrated OH- and the absorbed CO2 is released.
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| http://dx.doi.org/10.1039/c8cc02109k | DOI Listing |
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