Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, P. R. China.
Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, P. R. China and Tianjin Key Laboratory of Molecular Optoelectronics, Department of Chemistry, Tianjin University, Tianjin 300000, P. R. China.
Analyst. 2020 Mar 16;145(6):2398-2404. doi: 10.1039/c9an02481f.
The metal-organic framework (MOF-74) series has the most open metal sites. The metal ions have different bonding strengths with the ligand in MOF-74 and the bond of the ligand can be successively broken to obtain highly active heteroparticles by controlling the temperature, which is difficult to achieve using traditional methods. Magnetic NiCo/Fe3O4-MOF-74, which is fabricated using trimetallic NiCoFe-MOF-74 as a precursor, is simple and rational in comparison with the traditional magnetic core and tunable MOF shell hybrid composites that are formed using a step-by-step assembly strategy. After thermal treatment under a specific atmosphere, NiCo/Fe3O4-MOF-74 shows higher stability, strong magnetism and more active metal sites compared to the original MOF. NiCo/Fe3O4-MOF-74 shows excellent enrichment capability for the removal of tetracycline, with a high removal efficiency that reached 94.1% within 5 min, which is much higher than that of NiCoFe-MOF-74. The main interaction between the adsorbent and analyte is most likely attributed to the open metal sites that can form a stable metal-ligand with the antibiotic molecules. Furthermore, the material can be reused five times without considerable loss. The prepared material has potential applications for removing antibiotics with high efficiency at low cost. Therefore, the experiments described in this study provide a route to a broad class of MOF-based materials for detecting organic contaminants.
金属-有机骨架（MOF-74）系列具有最开放的金属位。金属离子与 MOF-74 中的配体具有不同的键合强度，通过控制温度可以相继断裂配体的键，从而获得高活性的杂粒子，这是传统方法难以实现的。与使用分步组装策略形成的传统磁性核和可调 MOF 壳杂化复合材料相比，使用三金属 NiCoFe-MOF-74 作为前体制备的磁性 NiCo/Fe3O4-MOF-74 更为简单合理。在特定气氛下进行热处理后，NiCo/Fe3O4-MOF-74 与原始 MOF 相比表现出更高的稳定性、强磁性和更多的活性金属位。NiCo/Fe3O4-MOF-74 对四环素的去除具有优异的富集能力，在 5 分钟内达到 94.1%的高去除效率，远高于 NiCoFe-MOF-74。吸附剂与分析物之间的主要相互作用很可能归因于开放的金属位，这些金属位可以与抗生素分子形成稳定的金属-配体。此外，该材料可重复使用五次而没有明显的损失。该制备材料具有高效去除抗生素的潜在应用，成本低廉。因此，本研究中描述的实验为基于 MOF 的材料检测有机污染物提供了一种广泛的途径。
