The phrase "to capture carbon" means the process of trapping and storing carbon dioxide (a greenhouse gas) emitted by human activities, preventing its release into the atmosphere. Full definition
The material could be used for capturing carbon dioxide from the atmosphere, and especially to clean emissions. (sciencedaily.com)
This isn't the first attempt to capture carbon emissions from power plants. (newsroom.ucla.edu)
Other potential uses for captured carbon dioxide include turning it into fuel, or replacing it all together by transforming plants into plastic. (scientificamerican.com)