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Hybrid Deep Eutectic Solvents with Flexible Hydrogen‐Bonded Supramolecular Networks for Highly Efficient Uptake of NH 3
Author(s) -
Li Yuhui,
Ali Mohammad Chand,
Yang Qiwei,
Zhang Zhiguo,
Bao Zongbi,
Su Baogen,
Xing Huabin,
Ren Qilong
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201701135
Subject(s) - supramolecular chemistry , ionic liquid , deep eutectic solvent , hydrogen bond , desorption , chemistry , eutectic system , solvation , solubility , aqueous solution , solvent , choline chloride , absorption (acoustics) , chemical engineering , molecule , selectivity , ionic bonding , inorganic chemistry , materials science , organic chemistry , ion , adsorption , catalysis , alloy , engineering , composite material
Serious environmental concerns have led to a great demand for efficient uptake of NH 3 by solvents. However, traditional aqueous absorbents have many shortcomings and efforts to use ionic liquids have met with limited success. A hybrid deep eutectic solvents (DESs) designed with a flexible hydrogen‐bonded supramolecular network exhibits both exceptional NH 3 uptake capacity and superior desorption–regeneration performance, along with superb NH 3 /CO 2 selectivity and environmental merit. Elucidated by molecular dynamic simulations and spectroscopic analysis, the abundant hydrogen‐bonding sites in the hybrid DESs bind every atom of the NH 3 molecule and enable strong physical reversible solvation, whereas the multiple interactions among the hybrid components create a flexible hydrogen‐bonded supramolecular network and allow for solvent‐unbreaking absorption to ensure the full participation of the solvent and process stability. A mass solubility of NH 3 up to 0.13 g g −1 was achieved at 313 K and 101 kPa by the hybrid DES choline chloride/resorcinol/glycerol (1:3:5), which is higher than all reported ionic liquids and ordinary DESs. Moreover, the performance remained the same after ten absorption–desorption cycles and the DESs could be easily regenerated.