期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 338, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.molliq.2021.116559
关键词
NO absorption; Thermodynamics; Ionic liquid; RETM; Phenol
资金
- Jiangsu Province Emergency Management Science and Technology Project [YJGL-TG-2020-10]
A series of phenolic ILs with different cations were synthesized and found to have excellent absorption performance for nitric oxide (NO), with their absorbability largely affected by the cationic bond-donating ability. These ILs may be used as promising absorbents for NO capture, as supported by the research findings.
A series of phenolic ILs with different cations were synthesized and used for the capture of nitric oxide (NO) in this work. These phenolic ILs showed excellent absorption performance because of the chemical interaction between the phenolate anion and the acidic NO. In particular, their absorbability for NO was largely affected by the cationic bond-donating ability. Tetrabutylphosphonium phenolate ([P-4444][PhO]) was thus highlighted with the cation of weak bond-donating ability, reaching a maximum solubility of 1 mol NO/mol IL at 1 bar and 313.2 K. With the assumption of complex formation between NO and phenolic ILs, the reaction equilibrium thermodynamic model (RETM) was constructed to correlate the experimental solubilities. Therefore, thermodynamic parameters such as the Henry's law constant H-m, the reaction equilibrium constants K, the enthalpy Delta H-SOL, and the entropy Delta S-SOL, could be achieved to evaluate the absorption performance of NO in the phenolic ILs. Furthermore, through a combination of experimental solubilities, RETM fitting results and spectroscopic investigations, the absorption mechanism was proposed that there was a chemical interaction between NO and the O-site on the phenolate anion, with the reaction stoichiometry of 1:1 and 2:1. All these data showed that the phenolic ILs may be used as a kind of promising absorbents for NO capture. (C) 2021 Elsevier B.V. All rights reserved.
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