Reversible absorption of SO2 by amino acid aqueous solutions

► β-Alanine solution is found to be excellent absorbent for SO2 removal. ► 20-30 °C is optimal for SO2 absorption, and 150 °C is optimal for desorption. ► The neutral environment (pH = 6.8) was found to be optimal for SO2 removal. ► SO2 interacts with β-alanine by some weak interactions, such as hydrogen bonds. ► The absorbent has an excellent regeneration performance.