Efficient CO2 absorption with MEA based hybrid absorbents in aqueous medium

Carbon dioxide (CO 2 ) capture is a crucial strategy for reducing greenhouse gas emissions and mitigating climate change. This study aimed to investigate the effects of absorption time and absorbent concentration on CO 2 capture efficiency. The study evaluated four aqueous sorbents, such as monoethanolamine (MEA), n-butanol, potassium hydroxide (KOH), and a combined MEA/n-butanol/KOH solution. Absorption experiments were conducted at contact times of 10, 20, and 30 min, with absorbent concentrations of 0.1, 0.5, and 1.0 M. The combined solution demonstrated the highest CO 2 absorption capacity of 19.89 mg/g at 30 min with a 1.0 M concentration. The optimized values for this study were predicted as 46.0 min absorption time, 2.0 M MEA concentration, and 5.0 g MEA amount. The projected and experimental absorption capacities were 22.48 mg/g and 22.8 ± 0.6 mg/g absorbent, respectively. The robust correlation observed between the predicted CO 2 absorption capacity and the experimental CO 2 absorption capacity validates the accuracy of the model and its consistency in identifying the optimal absorption conditions. Phase changes were observed in all solvents before and after CO 2 absorption. Fourier Transform Infrared Spectroscopy (FTIR) characterization revealed changes in peak intensities due to CO 2 absorption. The maximum desorption of 99.23 % has been achieved with 78 min desorption time and 80 °C desorption temperature. • Hybrid absorbent was used to capture CO 2 . • The maximum CO 2 absorption was 19.89 mg/g at 30 min with combined absorbent. • The optimized CO 2 absorption is 22.86 mg/g at optimum condition. • Phase change behavior and functionalities of the sorbent was examined.