Ammonia (NH₃) exhaust emission is not only a waste of chemical raw materials, but also harmful to the environment and human health. However, commercial methods scrubbing with water or acids face the challenges of high cost and waste disposal. Deep eutectic solvents (DESs) have attracted extensive attention due to their simple preparation process and low cost. In this work, we report an efficient and reversible dual-active-sites DES for NH₃ capture. The NH₃ absorption performance under different NH₃ partial pressures and temperatures, reversibility, selectivity of NH₃ to CO₂ as well as physicochemical properties of imidazole/resorcinol (1:1) were studied in detail. The results display that binary DES imidazole/resorcinol (1:1) can absorb up to 0.238 g NH₃ per g DES at 293.15 K and 0.1 MPa, which is much higher than most previously reported functional ionic liquids and DESs. Quantum chemistry calculations, NMR and FT-IR results suggest that the high absorption capacity stems from the intermolecular hydrogen bonding interaction between ammonia molecules and H-3 of imidazole and –OH of resorcinol. Consequently, reversible DES imidazole/resorcinol (1:1) shows promise for industrial NH₃ absorption.

氨气（NH ₃）的排放不仅是化学原料的浪费，而且对环境和人体健康也有害。然而，用水或酸洗涤的商业方法面临着高成本和废物处理的挑战。深共晶溶剂（DES）由于其制备过程简单且成本低廉而引起了广泛的关注。在这项工作中，我们报告了用于NH ₃捕集的高效且可逆的双活性位点DES 。在不同的NH ₃分压和温度下，NH _3的吸收性能，可逆性，NH ₃对CO _2的选择性以及咪唑/间苯二酚（1：1）的理化性质进行了详细研究。结果表明，二元DES咪唑/间苯二酚（1：1）在293.15 K和0.1 MPa下每g DES最多可吸收0.238 g NH ₃，这比以前报道的大多数功能性离子液体和DES高得多。量子化学计算，NMR和FT-IR结果表明，高吸收能力源于氨分子与咪唑的H-3和间苯二酚的-OH之间的分子间氢键相互作用。因此，可逆的DES咪唑/间苯二酚（1：1）显示出工业NH ₃吸收的希望。