Fabrication And Application Of Metal-organic Framework Composite Electrospun Fiber

Electrospinning technology is an effective method for the preparation of nanofiber which hadthe features of simple preparation,extensive raw material,controllable fiber morphology and continuous preparation.In order to expand the application of electrospinning,electrospun fibers are often compounded with other functional materials.Metal-organic framework?MOF?is a new kind of porous crystal material.Compared with traditional inorganic porous materials,it has a larger specific surface area,higher porosity,and more diverse structures and functions.The composite fibers prepared from them have important applications in gas separation,gas sensing,thin film catalysis and other fields.However,how to combine MOF with electrospun fibers through simple and effective methods is a major challenge.Based on this problem,two types of MOF-supported substrates were prepared by electrospinning.One was electrospun fiber polyacrylic acid?PAA?/polyvinyl alcohol?PVA?as the matrix material,and the other was electrospinning.Zinc oxide?ZnO?nanofibers were prepared as matrix materials,and MOFs with different morphology were composited with electrospun fibers by layer deposition and in-situ crystallization methods.The main research contents and results are as follows:?1?PAA/PVA composite nanofibers were prepared by electrospinning and cross-linked by heat treatment to obtain water-insoluble nanofibers.Then the HKUST-1?Hongkong University of Science and Technology?porous coordination polymer framework material and PAA/PVA nano-materials were prepared by a simple soaking method and layer self-assembly using the electrostatic interaction between metal and fiber.Fiber membrane composite.Finally,the prepared composite fiber can catalyze the reaction of o-phenylenediamine?OPD?and hydrogen peroxide?H₂O₂?to construct a hydrogen peroxide detection system,and realize visual inspection of H₂O₂.The results show that HKUST-1/PAA/PVA composite electrospun fibers have excellent catalytic activity and reproducibility.And in the five repeated catalysis has a catalytic effect,H₂O₂ can still be detected.?2?Zinc acetate/polyvinylpyrrolidone?Zn?CH₃COO?₂/PVP?composite nanofibers were prepared by electrospinning and calcined at 600?to obtain ZnO nanofibers.The prepared ZnO fiber was then used as a template for the growth of MOF to achieve a successful composite with ZIF-8 and ZIF-7.The finally prepared ZnO nanofibers can not only be used for the growth of ZIF-like MOFs,but also can be used as growth templates for HKUST-1,which are MOF-5,IRMOF-3,and Cu as metal ions.?3?The prepared ZIF-7/ZnO and ZIF-8/ZnO composite nanofibers were carbonized at950?to obtain MOF-derived carbon materials ZCNs-7 and ZCNs-8.The morphology was then characterized using scanning electron microscopy?SEM?and transmission electron microscopy?TEM?.Electrochemical workstations were used to test their electrochemical performance.The test results show that the obtained ZCNs-8 and ZCNs-7 have relatively stable specific capacitance,and the final prepared ZCN-7 has better supercapacitor performance.