Fe_3O_4@ZIF-8的制备及其在磁固相微萃取中的应用

Preparation of Fe_3O_4@ZIF-8 and Its Application in the Magnetic Solid-Phase Microextraction

制备了Fe3O4@ZIF-8磁纳米复合材料,以其作为吸附剂建立快速高效的磁固相微萃取方法。首先用水热法合成Fe3O4纳米球,然后进行羧基功能化,最后包覆ZIF-8外壳制备了Fe3O4@ZIF-8微球。以萘、蒽、咔唑、芴、联苯等多环芳烃为分析物建立HPLC-UV方法。以峰面积为响应信号,作为萃取条件优化实验的测量指标,考察微球用量、萃取时间、解吸溶剂种类、解吸溶剂用量、解吸时间等因素对萃取效果的影响,建立了快速高效的磁固相微萃取方法。用Fe3O4@ZIF-8磁纳米复合材料对环境水样中的痕量多环芳烃进行磁固相微萃取,实现了对环境水样中痕量多环芳烃的快速灵敏测定。

Fe3O4@ZIF-8 Magnetic nanocomposites were prepared and used as a kind of adsorbent to establish a rapid and efficient magnetic solid-phase microextraction method.First,Fe3O4 nanoparticles were synthesized with hydrothermal method.Then carboxylate-terminated Fe3O4 nanoparticles were synthesized.Finally,Fe3O4 nanoparticles were coated by ZIF-8shells to form Fe3O4@ZIF-8 microspheres.The polycyclic aromatic hydrocarbons（PAHs）,such as naphthalene,anthracene,carbazole,fluorene and biphenyl,were used as analytes to establish the HPLC-UV method.The peak areas were used as the response signal,which were used as measurements in optimizing extraction condition experiment.The effects of the dosage of microspheres,extraction time,types of desorption solvent,the dosage of desorption solvent,desorption time on the extraction efficiency were investigated.Thus the fast and efficient magnetic solid-phase microextraction method was established.The Fe3O4@ZIF-8magnetic nanocomposites were used as the adsorbent to extract the traces of PAHs in environmental water samples,and the determination was rapid and sensitive.