Abstract

Melamine-modified MIL-88 was synthesized through the solvothermal method and utilized as the extracting device for the µ-solid phase extraction (µ-SPE) of selected volatile organic compounds (VOCs) including benzene, toluene, ethylbenzene, and isomers of xylene (BTEXs) from different environmental water samples. The prepared melamine-MIL-88 (Fe) was enclosed inside the porous hydrophilic tea bag filter membrane. The sealed membrane containing the sorbent (15 mg) was used as the µ-SPE device. The quantification of the extracted BTEXs was done by gas chromatography-mass spectrometry (GC-MS) instrument. The prepared sorbent was confirmed by different characterizations including powdered X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transformed infrared (FT-IR) spectroscopy. The method provided linearity range of 0.5–500.0 µg L⁻¹ (depending on target analytes) and coefficients of determination (R²) with the range of 0.9891–0.9981 under the optimum condition. The enrichment factors (EFs) were found to be between 39.0 and 48.0. The limits of detection (LODs) were also calculated to be between 0.08 and 0.42 µg L⁻¹, while the range of corresponding absolute recoveries was in the range of 78–96%. The method relative standard deviations (RSDs) ranged from 5.5 to 11.8% (at 5.0 µg L⁻¹). Moreover, the prepared melamine-MIL-88 (Fe) showed high adsorption capacity (130 mg g⁻¹). The method is cost-effective, user-friendly, and with minimal consumption of organic solvent. In addition, melamine-MIL-88 has not yet been synthesized and investigated in the microextraction of the pollutants.

摘要

通过溶剂热法合成了三聚氰胺改性的 MIL-88，并用作萃取装置，用于对包括苯、甲苯、乙苯和二甲苯异构体在内的选定挥发性有机化合物 (VOC) 进行微固相萃取 (μ-SPE)。 BTEX) 来自不同的环境水样。将制备的三聚氰胺-MIL-88 (Fe) 封装在多孔亲水性茶包滤膜内。含有吸附剂 (15 mg) 的密封膜用作 µ-SPE 装置。通过气相色谱-质谱 (GC-MS) 仪器对提取的 BTEX 进行定量。制备的吸附剂通过不同的表征得到证实，包括粉末 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和傅里叶变换红外 (FT-IR) 光谱。该方法提供了 0.5–500 的线性范围。^-1（取决于目标分析物）和确定系数 ( R ² )，在最佳条件下的范围为 0.9891–0.9981。发现富集因子 (EF) 在 39.0 和 48.0 之间。检测限 (LOD) 也计算在 0.08 和 0.42 µg L ^-1之间，而相应的绝对回收率范围在 78-96% 范围内。方法的相对标准偏差 (RSD) 范围为 5.5 至 11.8%（在 5.0 µg L ^-1时）。此外，制备的三聚氰胺-MIL-88 (Fe) 显示出高吸附容量（130 mg g ^-1）。该方法具有成本效益，用户友好，并且有机溶剂消耗最少。此外，三聚氰胺-MIL-88 尚未被合成和研究用于污染物的微萃取。