Answer:
Carbon dioxide (CO₂) of air is remove when air is pass through aqueous sodium hydroxide.
Detail:
This method for capturing CO₂ from air or from any other source was developed by two scientists names as Lackner and Zeman. This methodology is very helpful from stopping CO₂ to enter our atmosphere and result in Global warming. The reaction of NaOH with CO₂ is as follow,
2 NaOH + CO₂ → Na₂CO₃ + H₂O
This is a type of liquid gas reaction and evolves around 5.3 kJ/mol heat.