Carbon dioxide uptake, you can use calcium hydroxide or its aqueous solution as absorbents.

http://www.sciencedirect.com/science/article/pii/S1876610209001404

Carbon dioxide absorption potentials of selected solvents were assessed by absorption at 40 ∘C up to 9.5kPa CO2 partial pressure and desorption at 80 ∘C down to 1.0 kPa CO2 partial pressure and compared with monoethanolamine (MEA). Results showed that cyclic capacity of MEA in mol CO2/molamine decreases with increase in concentration while its CO2 removal per cycle increases with concentration. Sarcosine neutralized with potassium hydroxide showed similar behaviour but slightly lower performance than MEA. Tetraethylenepentamine (TEPA) showed outstanding CO2 absorption potentials, it maintained very high absorption rate and removes high amounts of CO2 per cycle. 1.0 M TEPA removes 3 times more CO2 per cycle than 1.0 M MEA

Regards,                                 Leonid

Do you have the reference? or capacity in mmol/g or mg/g? Shen-Ming Chen