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Three-dimensional chitosan/graphene oxide aerogel for high-efficiency solid-phase extraction of acidic herbicides in vegetables

Abstract

A simple, facile method was adopted to synthesize three-dimensional chitosan grafted graphene oxide aerogels modified silica (3D CS/GOA@Sil) as the eco-friendly, sustainable extraction material for the preconcentration of phenoxy acid herbicides. An amidation reaction realized the immobilization of CS and GO on the surface of silica, followed by the freeze-drying technique to yield the CS/GOA@Sil with 3D architecture structure. Successful synthesis and properties of 3D CS/GOA@Sil were characterized and confirmed by scanning electron microscope, infrared spectrum, BET adsorption-desorption analysis, thermalgravimetric analysis. The surface area of 3D CS/GOA@Sil was twice as much as that of the individual GO@Sil. Besides, the adsorption and extraction time were also shorter due to the ordered porous structure and rapid mass transfer. Under the optimal conditions, coupled with high-performance liquid chromatography-ultraviolet detector, this as-established method presented wide linearities with desirable correlation coefficients (≥0.9936) and low limits of detection (≤1.5 μg L-1). Finally, it was applied to analyze phenoxy acid herbicides in vegetables, and satisfactory relative recoveries of 62.38-102.92% spiked at standard solutions with different concentrations were obtained.

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Supplementary files

Article information


Submitted
19 Apr 2020
Accepted
22 May 2020
First published
22 May 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Three-dimensional chitosan/graphene oxide aerogel for high-efficiency solid-phase extraction of acidic herbicides in vegetables

Q. Wu, W. Wu, X. Zhan and X. Hou, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ01960G

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