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Increasing the Stability of Metal–Organic Frameworks by Coating with Poly(tetrafluoroethylene)
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-03-15 , DOI: 10.1021/acs.inorgchem.2c00073
Yan-Li Huang 1 , Lin-Jie Ping 1 , Jie Wu 1 , Yan Yan Li 2 , Xiao-Ping Zhou 1
Affiliation  

When compared to industrially stable zeolites, the instability of metal–organic frameworks (MOFs) has been denounced by researchers. Boosting the stability of existing MOFs is highly important for practical applications. In this report, we develop a new strategy to prepare MOFs/poly(tetrafluoroethylene) (PTFE) composites, which can highly improve the chemical, pressure, and photostabilities of zeolitic imidazolate framework (ZIF)-8. Composite materials were prepared by a physical blending of ZIF-8 and PTFE emulsion with different ratios and annealing at 370 °C. Transmission electron microscopy (TEM) studies reveal that the nanoparticles of ZIF-8 are coated by PTFE to form the composite materials. Upon mixing with 20 or 50 wt % PTFE, the ZIF-8/PTFE materials show a superhydrophobic property with water contact angles of around 156°. Pristine ZIF-8 is not stable in water with stirring under acidic, basic, and irradiation conditions, while the ZIF-8/PTFE materials are stable under the same conditions. The ZIF-8/PTFE materials can also maintain their crystalline structure after being compressed with a 10 MPa pressure, while pristine ZIF-8 changes to an amorphous solid after the same pressure treatment. Using water as a solvent, ZIF-8/PTFE can be used as a highly efficient and recyclable catalyst for Knoevenagel reaction at room temperature. The successful preparation of stable ZIF-8/PTFE composite materials provides a useful method to enhance the chemical, pressure, and photostabilities of MOFs.

中文翻译:

通过涂覆聚(四氟乙烯)提高金属-有机框架的稳定性

与工业上稳定的沸石相比,研究人员谴责了金属有机骨架(MOF)的不稳定性。提高现有 MOF 的稳定性对于实际应用非常重要。在本报告中,我们开发了一种制备 MOFs/聚(四氟乙烯)(PTFE)复合材料的新策略,该策略可以显着提高沸石咪唑骨架(ZIF)-8 的化学、压力和光稳定性。复合材料是通过将不同比例的ZIF-8和PTFE乳液物理共混并在370°C下退火制备的。透射电子显微镜 (TEM) 研究表明,ZIF-8 的纳米颗粒被 PTFE 包覆形成复合材料。在与 20 或 50 wt % PTFE 混合后,ZIF-8/PTFE 材料显示出超疏水性能,水接触角约为 156°。Pristine ZIF-8 在酸性、碱性和辐照条件下在水中搅拌不稳定,而 ZIF-8/PTFE 材料在相同条件下是稳定的。ZIF-8/PTFE 材料在 10 MPa 压力下压缩后也可以保持其晶体结构,而原始 ZIF-8 在相同压力处理后变为无定形固体。以水为溶剂,ZIF-8/PTFE 可用作室温下 Knoevenagel 反应的高效可回收催化剂。成功制备稳定的 ZIF-8/PTFE 复合材料为提高 MOF 的化学、压力和光稳定性提供了有用的方法。ZIF-8/PTFE 材料在 10 MPa 压力下压缩后也可以保持其晶体结构,而原始 ZIF-8 在相同压力处理后变为无定形固体。以水为溶剂,ZIF-8/PTFE 可用作室温下 Knoevenagel 反应的高效可回收催化剂。成功制备稳定的 ZIF-8/PTFE 复合材料为提高 MOF 的化学、压力和光稳定性提供了有用的方法。ZIF-8/PTFE 材料在 10 MPa 压力下压缩后也可以保持其晶体结构,而原始 ZIF-8 在相同压力处理后变为无定形固体。以水为溶剂,ZIF-8/PTFE 可用作室温下 Knoevenagel 反应的高效可回收催化剂。成功制备稳定的 ZIF-8/PTFE 复合材料为提高 MOF 的化学、压力和光稳定性提供了有用的方法。
更新日期:2022-03-15
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