Fitting a straight line to the mass of CO 2 captured from 20 to 60 minutes for all cycles except the first yields capture rates of 0.062 ± 0.003 g/min, 0.193 ± 0.004 g/min, and 0.295 ± 0.017 g/min, for 5 mol%, 10 mol%, and 15 mol%, respectively. These values are based on a reactor with 1200 g of water. For larger systems with an equivalent flow path length, they can be simply scaled by multiplying with the volume of water used.