Abstract
CO2 hydrate formation kinetics are relatively slow, hindering large-scale implementation for carbon capture and storage. Amino acids have been widely investigated as green promoters for CO2 hydrate formation due to their potential in the CO2 uptake capacity. However, there is still a limited number of studies focusing on the application of biosurfactants for CO2 hydrate formation. In this study, four biodegradable surfactants (BSs), derived from castor oil, were investigated as efficient promoters for CO2 hydrate formation. BSs provided the highest promotion efficiency, enhancing CO2 uptake by 10 times and achieving a 50.19 % conversion degree compared to 6.45 % in pure water. An important characteristic of BSs is their high biodegradability, as demonstrated by a BOD/COD ratio of 52.2 % after 28 days. The combination of promotion power, non-foaming properties, and biodegradability makes BSs unique candidates for addressing the challenges associated with CO2 capture and storage using hydrate-based sequestration strategies.
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