| Summary: | In this study, we investigated the use of functionalized deep eutectic solvents (DESs) as a medium for CO<sub>2</sub> capture integrated with CO<sub>2</sub> desorption and biofixation in microalgal culture, as an approach for carbon capture, utilization, and storage (CCUS). The newly devised DES formulation—comprising choline chloride, ethylene glycol, and monoethanolamine—demonstrated a significant advancement in CO<sub>2</sub> absorption capacity compared with conventional solvents. Effective CO<sub>2</sub> desorption from the solvent was also achieved, recovering nearly 90% of the captured CO<sub>2</sub>. We then examined the application of the functionalized DESs to promote microalgal cultivation using a <i>Chlorella</i> sp. strain. The experimental results indicated that microalgae exposed to DES-desorbed CO<sub>2</sub> exhibited heightened growth rates and enhanced biomass production, signifying the potential of DES-driven CO<sub>2</sub> capture for sustainable microalgal biomass cultivation. This research contributes to the growing field of CCUS strategies, offering an avenue for efficient CO<sub>2</sub> capture and conversion into valuable biomasses, thereby contributing to both environmental sustainability and bioresource use.
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