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Updated: May 1, 2026

Author Spotlight: Standardizing the Development of Amine-Based Silica Composites as CO2 Adsorbents for Direct Air Capture
Published on: September 29, 2023
Capturing [¹¹C]CO₂ for use in aqueous applications
Nicholas T Vandehey1, James P O'Neil1
1Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
Abstract:
We present a simple method for trapping [(11)C]CO2 gas and releasing it into a buffered solution using an ion-exchange cartridge. Sodium hydroxide cartridges captured >99% of [(11)C]CO2 following NaOH activation. A sodium bicarbonate solution eluted >99% of trapped radioactivity. Trapping [(11)C]CO2 directly in small volumes of several solutions was less effective than cartridge methods. The recommended methods allow for fast and simple production of highly concentrated carbon-11 containing aqueous solutions for use in filling phantoms, calibrating detectors, or (bio)geochemical experiments.
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