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Designed multifunctional ionic liquids-magnetic graphene nanocomposites as the adsorbentn of MSPE for the determination of preservatives

Abstract

A new structural design of four kinds of ionic liquids were successfully fabricated, which was based on changing the anion of 1-vinyl-3-octylimidazolium bromide (VOIm+Br-) with benzene sulfonic acid (BenSO3-), 2-naphthalene sulfonic acid (NapSO3-), 1-anthraquinonesulfonic acid (AQSO3-) and 1,2-naphthoquinone-4-sulfonic acid (NQSO3-). Then designed ionic liquids were directly modified on the surface of magnetic graphene oxide reduced nanoparticles (Fe3O4@SiO2@G) and as a novel magnetic adsorbent for the determination of preservatives in vegetables by ultra high performance liquid chromatography–triple quadrupole/linear ion trap mass spectrometry (UPLC-MS/MS). In the study, the specific adsorption capacity of four kinds of functional ionic liquid magnetic graphene adsorbents were investigated. How the novel magnetic adsorbent function to 34 preservatives were revealed. While the functional ionic liquid, 1-vinyl-3-octylimidazole-2-naphthalene sulfonate (VOIm+ NapSO3-), combined with Fe3O4@ SiO2@G adsorbent had better adsorption capacity than other adsorbents, the reasons were that the structure of the ionic liquid with two benzene ring could produce the appropriate intensity of π-π conjugation, small steric hindrance was easy to combine with preservatives, the imidazole ring and the hydroxyl provided the possibility of formative hydrogen bonding. The detailed chemical and microstructural features of the hybrid nanomaterials were studied by SEM, VSM, FTIR and XPS analyses. Under the optimal conditions, the satisfactory detection limits (LOD) of this method was in the range of 0.01~0.15 µg/L. This study revealed the potential of the VOIm+NapSO3- attached Fe3O4@SiO2@G nanomaterials as novel adsorbents for pretreatment applications.

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Publication details

The article was received on 27 Nov 2017, accepted on 19 Jan 2018 and first published on 12 Feb 2018


Article type: Paper
DOI: 10.1039/C7AY02746J
Citation: Anal. Methods, 2018, Accepted Manuscript
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    Designed multifunctional ionic liquids-magnetic graphene nanocomposites as the adsorbentn of MSPE for the determination of preservatives

    S. Cao, Y. Chen, L. Zhang, C. Xi, X. li, B. Tang, G. wang and Z. Chen, Anal. Methods, 2018, Accepted Manuscript , DOI: 10.1039/C7AY02746J

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