Citation: ZHOU Shu-Wei, FU Hong, XUE Xiao-Kang, KE Qiu-Xuan, CHANG Qiao-Ying, YANG Fang. Preparation of Magnetic Graphitized Carbon Black Based on Crystal Growth Method and Its Application in Detection of Pesticide Residues in Tea[J]. Chinese Journal of Analytical Chemistry, ;2022, 50(3): 472-481. doi: 10.19756/j.issn.0253-3820.210844 shu

Preparation of Magnetic Graphitized Carbon Black Based on Crystal Growth Method and Its Application in Detection of Pesticide Residues in Tea

¹College of Biological Science and Engineering, Fuzhou University, Fuzhou 350108, China;
²Fuzhou Customs Technical Center, Fuzhou 350001, China;
³College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China

Corresponding author: YANG Fang, 964890740@qq.com
Received Date: 18 November 2021
Revised Date: 30 December 2021

Fund Project: Supported by the National Key Research and Development Project of China (No.2017YFF0211304) and the Fujian Natural Science Fund Project (No.2020J1098).

A uniform and stable ferroferric oxide supported graphitized carbon black magnetic nanomaterial (GCB/Fe₃O₄) was prepared by crystal formation method. The crystal structure, surface morphology and magnetic properties of GCB/Fe₃O₄ were investigated by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction and vibrating magnetometer. The adsorption properties of GCB/Fe₃O₄ for pigment, polyphenol and other interfering substances were studied by taking catechin, curcumin, quercetin, chlorophyllin and β-carotene as objects. The results showed that the magnetic nanomaterials GCB/Fe₃O₄ retained the original adsorption characteristics of GCB successfully and possessed magnetism. The saturated adsorption capacity of catechin, curcumin, quercetin, chlorophyllin and β-carotene were 7.87, 9.19, 5.65, 3.35 and 6.13 mg/g, respectively, which were increased by 187.2%, 28.9%, 55.2%, 52.3% and 4.6%, respectively, in comparison with GCB. GCB/Fe₃O₄ was used as magnetic adsorbent to purify 405 kinds of pesticide residues in tea. Compared with the current solid phase extraction or QuEChERs, the operation was simpler and faster, and the purification time could be saved by more than 15%. The recoveries of 393 kinds of pesticide residues in tea were 60%-120%, and the relative standard deviations were 2.6%-14.6%. The experimental results showed that the prepared GCB/Fe₃O₄ had good adsorption properties and good stability, and could be used for sample pretreatment of pesticide residues in tea.
- Crystal growth method,
- Magnetic graphitized carbon black,
- Tea,
- Pesticide residues
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