Conventional carbon nanofibers usually require high temperatures during graphitization,which not only causes energy wastage but also causes a certain degradation of the strength of carbon nanofibers at extremely high temperatures.Therefore,reducing the temperature of graphitization has become a hot research topic.In this thesis,the preparation of metallic carbon nanofiber composites was carried out by electrostatic spinning technique using polyacrylonitrile(PAN)-based carbon nanofibers as a carrier and metal catalyst as an additive.Scanning electron microscopy(SEM),high-resolution transmission electron microscopy(HRTEM),Raman spectroscopy(RAMAN),X-ray diffraction(XRD),and other characterization tools were used to investigate the graphitization degree of metal carbon nanofiber composites and to test their adsorption properties.The effects of catalyst content and carbonization temperature on the properties of the composite fibers were investigated,and the main conclusions are as follows:1.Cu Cl2/CNF was prepared by electrostatic spinning technique and pre-oxidation and carbonization using Cu Cl2as catalyst.graphitization of Cu Cl2/CNF increased with the increase of carbonization temperature and Cu Cl2content.At the carbonization temperature of 1100°C and the Cu Cl2addition of 20wt%,clear graphitization streaks were observed in the HRTEM of Cu Cl2/CNF,and the graphitization degree was calculated as 32.56%according to XRD,and the conductivity increased significantly with the increase of carbonization temperature.The specific surface area was measured by N2adsorption-desorption curves,with a maximum of 113.03m2/g,which is 13 times higher than that of CNF,and has a smaller pore size.For the adsorption experiments of rhodamine B and methylene blue,10.29 mg/g and 10.69 mg/g could be adsorbed at90min.2.Fe(NO3)3/CNF was prepared by electrostatic spinning technique and pre-oxidation and carbonization using Fe(NO3)3as catalyst.The graphitization of Fe(NO3)3/CNF composite fibers increased with increasing carbonization temperature and Fe(NO3)3 content by RAMAN and XRD characterization.And the graphitization streaks were observed in HRTEM of 20%Fe(NO3)3/CNF-1100°C,indicating the development from disordered carbon structure to ordered graphite structure with 43.95%graphitization.20%Fe(NO3)3/CNF conductivity increased with the increase of carbonization temperature.And according to the N2adsorption-desorption curve test,the maximum specific surface area was measured as 242.04m2/g,the average pore size was 3.17nm,and the pore volume also increased significantly.In the adsorption experiments of rhodamine B and methylene blue,when adsorbed for 90 min,13.33mg/g and 13.70mg/g could be adsorbed,which showed good adsorption performance. |