Anhui Provincial Engineering Laboratory for Screening and Re-evaluation of Active Compounds of Herbal Medicines in Southern Anhui, School of Pharmacy, Wannan Medical College, Wuhu 241002, China.
Anhui Provincial Engineering Laboratory for Screening and Re-evaluation of Active Compounds of Herbal Medicines in Southern Anhui, School of Pharmacy, Wannan Medical College, Wuhu 241002, China; Anhui Laboratory of Molecule-based Materials, College of Chemistry and Materials, Anhui Normal University, Wuhu 241002, China.
J Hazard Mater. 2023 Sep 5;457:131788. doi: 10.1016/j.jhazmat.2023.131788. Epub 2023 Jun 7.
Organothiophosphate pesticides (OPPs) are the most common water contaminants, significantly endangering human health and bringing serious public safety issues. Thus, developing effective technologies for the removal or trace detection of OPPs from water is urgent. Herein, a novel graphene-based silica-coated core-shell tubular magnetic nanocomposite (Ni@SiO-G) was fabricated for the first time and used for the efficient magnetic solid-phase extraction (MSPE) of the OPPs chlorpyrifos, diazinon, and fenitrothion from environmental water. The experimental factors affecting extraction efficiency such as adsorbent dosage, extraction time, desorption solvent, desorption mode, desorption time, and adsorbent type were evaluated. The synthesized Ni@SiO-G nanocomposites showed a higher preconcentration capacity than the Ni nanotubes, Ni@SiO nanotubes, and graphene. Under the optimized conditions, 5 mg of tubular nano-adsorbent displayed good linearity within the range of 0.1-1 μg·mL, low limits of detection (0.04-0.25 pg·mL), low limits of quantification (0.132-0.834 pg·mL), good reusability (n = 5; relative standard deviations between 1.46% and 9.65%), low dosage (5 mg), and low real detection concentration (< 3.0 ng·mL). Moreover, the possible interaction mechanism was investigated by density functional theory calculation. Results showed that Ni@SiO-G was a potential magnetic material for the preconcentration and extraction of formed OPPs at ultra-trace levels from environmental water.
有机磷农药（OPPs）是最常见的水污染物质，严重威胁人类健康，带来严重的公共安全问题。因此，开发从水中去除或痕量检测 OPPs 的有效技术迫在眉睫。本文首次制备了一种新型基于石墨烯的二氧化硅包覆核壳管状磁性纳米复合材料（Ni@SiO-G），并用于从环境水中高效磁固相萃取（MSPE）有机磷农药氯吡硫磷、二嗪农和三唑磷。研究了影响萃取效率的实验因素，如吸附剂用量、萃取时间、洗脱溶剂、洗脱模式、洗脱时间和吸附剂类型。与 Ni 纳米管、Ni@SiO 纳米管和石墨烯相比，合成的 Ni@SiO-G 纳米复合材料表现出更高的预浓缩能力。在优化条件下，5 mg 管状纳米吸附剂在 0.1-1 μg·mL 的范围内表现出良好的线性关系，检测限低（0.04-0.25 pg·mL），定量限低（0.132-0.834 pg·mL），良好的可重复性（n=5；相对标准偏差在 1.46%至 9.65%之间），低剂量（5 mg）和低实际检测浓度（<3.0 ng·mL）。此外，还通过密度泛函理论计算研究了可能的相互作用机制。结果表明，Ni@SiO-G 是一种潜在的磁性材料，可用于从环境水中预浓缩和提取痕量形成的 OPPs。
