Efficient and selective absorption of NH3 by supramolecular OHP[5]-based ternary deep eutectic solvents
Journal of Molecular Liquids(2024)
摘要
Developing an efficient absorbent for selective ammonia capture is of significant importance in the recovery and utilization of ammonia resources. Herein, a series of supramolecular-based ternary deep eutectic solvents (DESs) was designed and prepared using per-hydroxy pillar[5]arene (OHP[5]) and ethylamine hydrochloride as the key components. It is found that the supramolecular-based ternary DES EaCl-Gly (1:2)-6% OHP[5] could be employed as an efficient absorbent for reversible absorption of NH3. The NH3 uptake capacity reached 2.39 mmol/g and 10.84 mmol/g at 298.2 K under the pressure of 10 kPa and 100 kPa, respectively. Meanwhile, a higher NH3/CO2 selectivity (84) was obtained at 298.2 K and 100 kPa owing to the low solubility of CO2 in EaCl-Gly (1:2)-6% OHP[5]. The results of 1H NMR and FTIR spectra further clarified the absorption mechanism of NH3 by EaCl-Gly (1:2)-6% OHP[5]. Accordingly, the chemical absorption and physical dissolution capacity of NH3 in EaCl-Gly (1:2)-6% OHP[5] were calculated on the basis of isotherm data and thermodynamic equations. This study offers a promising application of pillar[5]arene to form supramolecular-based DESs for efficient NH3 absorption.
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关键词
NH3 capture,Deep eutectic solvent,Pillar[5]arene,High selectivity
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