Carbonized metal-organic framework-74/carbon aerogel composites for the efficient extraction of triazole fungicides from fruits and vegetables

化学 气凝胶 碳化 萃取(化学) 火焰离子化检测器 解吸 吸附 固相萃取 色谱法 热解 检出限 中心组合设计 气相色谱法 水热碳化 碳纤维 核化学 响应面法 复合数 有机化学 材料科学 复合材料
作者
Min Sun,Haili Sun,Juanjuan Feng,Jiaqing Feng,Jing Fan,Mingxia Sun,Yang Feng
出处
期刊:Journal of Chromatography A [Elsevier BV]
卷期号:1683: 463552-463552 被引量:15
标识
DOI:10.1016/j.chroma.2022.463552
摘要

To improve the extraction efficiency, availability, and stability of metal-organic framework (MOF) for pipette-tip solid-phase extraction (PT-SPE), a carbonized MOF-74/carbon aerogel composite (CMOF-74/CA) was developed. A carbon aerogel with a surface area of 547.7 m2 g-1 was prepared by carbonizing a watermelon peel. After that, via a hydrothermal reaction, the MOF-74 was in situ grown on the surface. After the pyrolysis at 700 °C for 2 h, the CMOF-74/CA composite was obtained. Through regulating the concentration of reactants, a series of MOF-74/CA and CMOF-74/CA materials were prepared. These materials were used to extract hexaconazole and diniconazole in fruits and vegetables before gas chromatography-flame ionization detection (GC-FID). The adsorbent type and amount, sample pH, and the desorption solvent type and volume were optimized factor by factor. Under the optimized conditions, a PT-SPE-GC-FID method was established. Moreover, good linearity in the concentration ranges of 0.098-200.0 mg kg-1 and 0.196-200.0 mg kg-1, and detection limits ranging between 0.033 and 0.065 mg kg-1 were achieved for two triazole fungicides (TFs). The relative standard deviations (n = 3) for intra-day and inter-day tests were in the ranges of 3.1-3.2% and 3.0-3.4%, respectively. The method showed satisfactory analytical performance in different samples with good relative recoveries in the range of 72.6-116%. Compared with some methods, it displayed wider linearity, better or comparable sensitivity, and enhanced analytical precision.
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