ie503432n_si_001.pdf (1.01 MB)
Extraction of Phenols from Water with Functionalized Ionic Liquids
journal contribution
posted on 2014-12-24, 00:00 authored by Yunchang Fan, Yun Li, Xing Dong, Guitao Hu, Shaofeng Hua, Juan Miao, Dongdong ZhouA series of hydroxyl-, benzyl-, and
dialkyl-functionalized ionic
liquids (ILs) were synthesized, and their extraction abilities for
phenol, resorcinol, p-nitrophenol, guaiacol, and o-cresol were investigated. Results showed that the extraction
efficiencies of the five phenols were significantly influenced by
the pH values, salt added, phase ratio, and chemical structure of
the IL. Phenols present in nonionized forms were preferable to transfer
into IL phases. The anion/cation hydrogen-bonding characters of ILs
were the main structural factors affecting the extraction efficiency,
which also increased with increased hydrophobicity of phenols. These
results are promising for the liquid–liquid extraction and
enrichment of phenols in separation science and related industrial
processes.