Journal
TALANTA
Volume 267, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2023.125236
Keywords
Metal-organic framework; Covalent organic framework; MOF/COF; SPME; PAHs
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This study developed a novel adsorbent, Zn-MOF/COF, by combining Zn-based MOF and melamine-based COF. The resulting Zn-MOF/COF sorbent exhibited lower cost and higher extraction efficiency compared to commercial and homemade adsorbents. It was successfully employed for the extraction and enrichment of PAHs in contaminated soil samples.
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 degrees C for 30 min extraction with 23 mu L g-1 sample's moisture level, linear responses of six PAHs were ranging from 1 to 20000 ng g-1 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.
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