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Efficient removal and trace determination of chlorophenols from water by mixed hemi/ad-micelle ionic liquid-coated magnetic graphene oxide and adsorption mechanism

Abstract

A mixed hemimicelles magnetic solid phase extraction (MHMSPE) based on magnetic graphene oxide nanoparticles (MGONPs) and 1-hexadecyl-3-methylmidazoliumbromide (C16mimBr) was developed for the efficient removal and trace determination of chlorophenols (CPs) in environmental water. The adsorption mechanism of three kind of CPs was studied by applied the computer simulation and zeta-potential studies. The large surface area and excellent adsorption capacity of the MGONPs after coated with C16mimBr were exploited adequately in MHMSPE process. Comparative studies showed that MGONPs were superior to Fe3O4NPs as adsorbent for the extraction of more CPs in MHMSPE. Zeta-potential data indicated that mixed hemimicelles were formed when the amount of C16mimBr was adjusted from 1.8 to 12 mg (MGONPs = 30 mg). Different carbon chain lengths of ILs coated MGONPs were used as further comparative study. Response surface methodology (RSM) based on Central Composite Design (CCD) was successfully applied to optimize the extraction parameters. Under optimum conditions, good linearity was obtained for two target analytes, with correlation coefficients (R2) ranging from 0.9945 to 0.9975; the limits of detection (LOD) were in the range of 0.10-0.13 μg L−1. Finally, MGONPs-C16mimBr were successfully applied for both removal and trace determination of two CPs in environmental and tap water samples and the extraction recoveries for 1.00 μg of 2,4-DCP and 2,4,6-TCP were in the range of 78~82% and 87~90%, with high preconcentration factors (PFs) of 410 and 456, respectively.

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Publication details

The article was received on 16 May 2017, accepted on 13 Jul 2017 and first published on 13 Jul 2017


Article type: Paper
DOI: 10.1039/C7AY01241A
Citation: Anal. Methods, 2017, Accepted Manuscript
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    Efficient removal and trace determination of chlorophenols from water by mixed hemi/ad-micelle ionic liquid-coated magnetic graphene oxide and adsorption mechanism

    W. Liu, J. Zha, X. Meng, J. Wu, C. Sun, P. Qiu, M. Fizir and H. He, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY01241A

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