期刊
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
卷 1072, 期 -, 页码 123-129出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jchromb.2017.11.013
关键词
Adsorption energy; Graphene oxide; Ionic liquid; Phenolic acid; Solid-phase extraction
资金
- National Natural Science Foundation of China [21575149, 21505146, 21575148]
- Key Laboratory of Chemistry of Northwestern Plant Resources, Chinese Academy of Sciences, China [CNPR-2015kfkt-01]
An environmental friendly sorbent of polymeric ionic liquids modified graphene oxide-grafted silica (PILs@GO@Sil) was synthesized for solid-phase extraction (SPE) of phenolic acids. The sorbent was prepared via a chemical layer-to-layer fabrication including amidation reaction, surface radical chain-transfer polymerization and in situ anion exchange. After modification with PILs, the silica surface had higher positive potential so that it would exhibit stronger electrostatic interaction for acidic compounds compared with GO@Sil. The adsorption performance of phenolic acids was investigated through the theoretical calculation and static, kinetic state adsorption experiments. Under the optimized conditions, wide linear ranges were obtained with correlation coefficients ranging from 0.9912 to 0.9998, and limits of detection were in the range of 0.20-0.50 mu g L-1. Compared with other reported methods, the proposed PILs@GO@Sil-SPE-HPLC showed higher extraction efficiency. Finally, the black wolfberry yogurt and urine were analyzed as real samples and good recoveries spiked with standard solution were obtained.
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