Controlling the SO₂ emissions is crucial because they result in several environmental problems and affect human health. Several techniques have been proposed for controlling SO₂ emissions. Limestone or lime-based absorbents are widely used for SO₂ removal. However, their low solubility limits their applications. Ammonia solution has attracted attention owing to its higher SO₂ removal efficiency. However, owing to its high volatility, it has the propensity to escape, which can cause secondary environmental pollution. Therefore, we investigated the effect of six amino acid additives to improve the SO₂ absorption performance and inhibit the ammonia escape in aqueous ammonia solution. The surface tension and theoretical breakthrough pressure of the amino acid-containing ammonia solutions was investigated to evaluate their applicability to a membrane contactor process. L-histidine (His) exhibited the best performance. Therefore, the effect of His concentration, inlet SO₂ concentration, and absorption temperature on SO₂ absorption performance was explored. The ¹³C nuclear magnetic resonance (NMR) and ¹H NMR analyses were used to study the SO₂ absorption mechanism. This study provides a strategy for preparing an eco-friendly and highly efficient SO₂ absorbent that can overcome the disadvantage of current ammonia solutions for the removal of low-concentration SO₂ from industrial gas emissions for the membrane contactor process application.

控制 SO ₂排放至关重要，因为它们会导致若干环境问题并影响人类健康。已经提出了几种控制SO ₂排放的技术。石灰石或石灰基吸收剂广泛用于 SO ₂去除。然而，它们的低溶解度限制了它们的应用。氨溶液因其较高的 SO ₂去除效率而备受关注。但由于其挥发性高，具有逃逸倾向，会造成二次环境污染。因此，我们研究了六种氨基酸添加剂对改善 SO _{2的效果。}吸收性能和抑制氨水溶液中的氨逸出。研究了含氨基酸氨溶液的表面张力和理论突破压力，以评估它们对膜接触器工艺的适用性。L-组氨酸（His）表现最好。因此，研究了His浓度、入口SO ₂浓度和吸收温度对SO ₂吸收性能的影响。¹³ C核磁共振(NMR)和1 ^H NMR分析用于研究SO ₂吸收机理。本研究提供了一种制备环保高效 SO _2的策略吸收剂可以克服目前氨溶液的缺点，用于从膜接触器工艺应用中去除工业气体排放物中的低浓度 SO _{2 。}