Researchers from the Massachusetts Institute of Technology (MIT) in the US have developed a new technology to capture carbon dioxide from a stream of air, virtually at any concentration level.
Working:
While most methods of removing carbon dioxide from a stream of gas required higher concentrations such as those found in the flue emissions from fossil fuel-based power plants, the new method could take out the gas even when it was present in very low concentrations.
The device is a large, specialized battery with a stack of electrodes that absorbs carbon dioxide from the air passing over its surface as it was being charged up, and then released the gas as it was being discharged.
A chemical reaction takes place at the surface of each of a stack of electrodes as the battery charges. Electrodes are coated with a compound called polyanthraquinone compounded with carbon nanotubes.
The electrodes have a natural affinity for carbon dioxide and readily reacted with its molecules in the airstream or feed gas. The device operates at room temperature and normal air pressure.
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