Koonani Samira, Ghiasvand Alireza
Department of Analytical Chemistry, Faculty of Chemistry, Lorestan University, Khoramabad, Iran.
Talanta. 2024 Jan 15;267:125236. doi: 10.1016/j.talanta.2023.125236. Epub 2023 Sep 23.
This study involved the development of a novel adsorbent by combining a Zn-based MOF with a melamine-based COF, resulting in the formation of a hybrid material known as Zn-MOF/COF. The adsorbent was characterized using FT-IR, SEM, XRD, EDX, and BET analysis techniques. The resulting Zn-MOF/COF sorbent was employed to prepare solid-phase microextraction (SPME) fibers for the extraction and enrichment of polycyclic aromatic hydrocarbons (PAHs) in contaminated soil samples, after coupling with GC-FID. A Box-Behnken design (BBD) was used to optimize key variables of SPME conditions. Under optimal conditions of 85 °C for 30 min extraction with 23 μL g sample's moisture level, linear responses of six PAHs were ranging from 1 to 20000 ng g⁻ with determination coefficients greater than 0.99. Limits of detection (LODs) were over the ranges of 0.1-1 ng g-1. The RSDs for intra-fiber and inter-fiber analyses were obtained 2.2-6.6% and 5.2-11.6%, respectively. Relative recoveries values for real soil samples were found to be 91.1-110.2%. The results showed lower cost and higher extraction efficiency for the Zn-MOF/COF fiber, compared with commercial and homemade adsorbents.
本研究通过将锌基金属有机框架（Zn-based MOF）与三聚氰胺基共价有机框架（COF）相结合，开发了一种新型吸附剂，形成了一种称为Zn-MOF/COF的混合材料。使用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X射线衍射（XRD）、能谱分析（EDX）和比表面积分析（BET）技术对该吸附剂进行了表征。将所得的Zn-MOF/COF吸附剂与气相色谱-火焰离子化检测器（GC-FID）联用，制备了用于萃取和富集污染土壤样品中多环芳烃（PAHs）的固相微萃取（SPME）纤维。采用Box-Behnken设计（BBD）优化SPME条件的关键变量。在85℃下萃取30分钟、样品含水量为23μg g的最佳条件下，六种PAHs的线性响应范围为1至20000 ng g⁻，测定系数大于0.99。检测限（LODs）在0.1-1 ng g-1范围内。纤维内和纤维间分析的相对标准偏差（RSDs）分别为2.2-6.6%和5.2-11.6%。实际土壤样品的相对回收率为91.1-110.2%。结果表明，与商业和自制吸附剂相比，Zn-MOF/COF纤维成本更低，萃取效率更高。
