ZrO2 Nanoparticles and Poly(diallyldimethylammonium chloride)-Doped Graphene Oxide Aerogel-Coated Stainless-Steel Mesh for the Effective Adsorption of Organophosphorus Pesticides.

Xiudan Hou,Rong Ding,Shihai Yan,Wei Wu,Haiyan Zhao,Qingli Yang

doi:10.3390/foods10071616

Xiudan Hou, Rong Ding + Show 4 more

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https://doi.org/10.3390/foods10071616

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Journal: Foods (Basel, Switzerland)	Publication Date: Jul 13, 2021
Citations: 8	License type: CC BY 4.0

Affiliation: Qingdao Agricultural University

Abstract

A novel sorbent based on the ZrO2 nanoparticles and poly(diallyldimethylammonium chloride)-modified graphene oxide aerogel-grafted stainless steel mesh (ZrO2/PDDA-GOA-SSM) was used for the extraction and detection of organophosphorus pesticides (OPPs). Firstly, the PDDA and GO composite was grafted onto the surface of SSM and then freeze-dried to obtain the aerogel, which efficiently reduced the accumulation of graphene nanosheets. It integrated the advanced properties of GOA with a thin coating and the three-dimensional structural geometry of SSM. The modification of ZrO2 nanoparticles brought a selective adsorption for OPPs due to the combination of the phosphate group as a Lewis base and ZrO2 nanoparticles with the Lewis acid site. The ZrO2/PDDA-GOA-SSM was packed into the solid-phase extraction (SPE) cartridge to extract OPPs. According to the investigation of different factors, the extraction recovery was mainly affected by the hydrophilic-hydrophobic properties of analytes. Effective extraction and elution parameters such as sample volume, sample pH, rate of sample loading, eluent, and eluent volume, were also investigated and discussed. Under the optimal conditions, the linearity of phoxim and fenitrothion was in the range of 1.0–200 μg L−1, and the linearity of temephos was in the range of 2.5–200 μg L−1. The limits of detection were ranged from 0.2 to 1.0 μg L−1. This established method was successfully applied to detect OPPs in two vegetables. There was no OPP detected in real samples, and results showed that the matrix effects were in the range of 46.5%–90.1%. This indicates that the ZrO2/PDDA-GOA-SSM-SPE-HPLC method could effectively extract and detect OPPs in vegetables.

Highlights

Pesticide residue is an importantly concerning aspect of food safety
The surface morphology of ZrO2 /PDDAGOA-modified SSM was investigated through the SEM characterization
SEM images confirmed that the ZrO2 nanoparticle-modified graphene sheets were completely and uniformly coated onto the surface of every stainless-steel wire of SSM

Summary

Introduction

Pesticide residue is an importantly concerning aspect of food safety. The population of food poisoning caused by pesticides occupies one-third of the total number of people of food poisoning, among which organophosphorus pesticides (OPPs) take the first place. OPPs, as a class of agricultural chemicals, are mainly used to prevent the invasion of insects. Excess of OPPs remain in the surface and body of agricultural products, infiltrate into the environmental samples, and enter into the human body, which can cause headache, dyspnea, and dysphoria symptoms [1,2]. China and other countries have stipulated that the maximum residue limit of most OPPs should not be higher than 0.2 mg kg−1 or 0.5 mg kg−1 [4].

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