Mitigating climate change requires innovative strategies to reduce CO₂ emissions. This thesis explores choline prolinate and dimethyl pyrrolidinium prolinate, two bio-based ionic liquids, as potential alternatives for post-combustion CO₂ capture. While ILs offer tunable properties, low volatility, and excellent thermal stability, their inherently high viscosity can hinder mass transfer and CO₂ absorption efficiency. To overcome this limitation, this study investigates the dilution of ILs with dimethyl sulfoxide to optimize the balance between chemical reactivity and mass transfer while preserving the advantages of bio-based ionic liquids. The ILs were synthesized through controlled reactions using bioavailable precursors and characterized using differential scanning calorimetry, physical property measurements, ATR-IR spectroscopy, and thermogravimetric analysis-infrared.