Exploring biocompatible and biodegradable materials for application in chemical processes is an important task of green chemistry. In this work, deep eutectic solvents (DESs) composed of natural compounds−choline chloride (ChCl) and sugars−were proposed as NH₃ absorbents for the first time. The capture of NH₃ from industrial tail gas is of great significance, to control air pollution and recycle N resources. The physiochemical properties of DESs were characterized, and the NH₃ capture performance was examined systematically. Due to the presence of abundant hydroxyl groups that enable strong hydrogen-bond interaction with NH₃ in DESs, the absorption of NH₃ displays non-ideal behavior, and the NH₃ capacities show small decrease as temperatures increase. Thus, ChCl+sugar DESs exhibit the ability to effectively capture NH₃ from dilute sources at elevated temperatures (e.g., 1.745 mol/kg at 343.2 K and 14.0 kPa), which is very important for practical application. The mechanism of NH₃ absorption was validated by spectroscopic characterizations and quantum chemistry calculations. Moreover, the absorption of NH₃ in ChCl+sugar DESs also show excellent selectivities over other components in industrial tail gas (e.g., N₂, H₂ and CO₂), as well as good reversibility.

探索用于化学过程的生物相容性和可生物降解材料是绿色化学的重要任务。在这项工作中，首次提出了由天然化合物氯化胆碱（ChCl）和糖类组成的深共熔溶剂（DESs）作为NH ₃吸收剂。从工业尾气中捕获NH ₃对于控制空气污染和循环利用氮资源具有重要意义。表征了DES的理化性质，并系统地考察了NH _3的捕获性能。由于丰富的羟基基团，使与强NH氢键相互作用的存在₃中DESS，NH的吸收_3只显示非理想行为，并且NH ₃容量随温度升高而略有下降。因此，ChCl +糖DES在高温下（例如，在343.2 K和14.0 kPa下为1.745 mol / kg）具有从稀源中有效捕获NH ₃的能力，这对于实际应用非常重要。通过光谱表征和量子化学计算验证了NH ₃吸收的机理。此外，ChCl +糖DES中NH ₃的吸收也显示出优于工业尾气中其他组分（例如N ₂，H ₂和CO ₂）的优异选择性，以及良好的可逆性。