Preparation Of One-dimensional Functional Materials By Modified Polyacrylonitrile Fiber Template Method And Its Performance Research

Polyacrylonitrile fiber(PAN)is one of the three major synthetic fibers.It is widely used in life and produces a large amount of PAN waste silk.It is difficult to deal with these waste materials by ordinary methods.The activity of cyano groups on the molecular chain of polyacrylonitrile is high,and it can react with other reagents under certain conditions.Considering various factors such as economic benefits and the environment,it is a practical way to prepare other products through modification to apply them to more industriesIn this project,the surface of PAN fiber is modified by hydrolysis treatment with a sulfuric acid solution with a mass fraction of 50%at a temperature of 120℃,so that a hydrogel of polyacrylic acid and polyacrylamide is formed on the surface.When this kind of hydrolyzed modified fiber(PAN-COOH fiber)is used as a template to prepare composite materials,the hydrogel on the surface of the fiber acts as a pore-forming agent and a catalyst.To solve the problem of sterilization in water,this subject used PAN-COOH fiber as a template to prepare silver particles loaded carbon fiber(Ag@C fiber),and conducted characterizations of SEM,XPS,XRD and Raman on this Ag@C fiber.Studies have shown that the metallic silver on the fiber surface exhibits a porous structure,which may result from the decomposition of the hydrogel on the fiber surface.SEM observation and surface enhanced Raman scattering(SERS)effect confirmed the existence of nano silver particles The porous surface increases the contact area between the nano silver particles and the bacterial solution and enhances the release effect of Ag+.This unique structure exhibits a strong bactericidal effect on killing Staphylococcus aureus.In the experiment,the sterilization rate of 1 mg of fiber against Staphylococcus aureus reached 99%after 12 hours The carbon fiber as a carrier makes it easier to recycle than nano silver particles.Therefore,Ag@C fibers have the potential to be applied in water sterilization.In order to solve the problem of degradation of organic pollutants in water,this topic used PAN-COOH fiber obtained by modifying PAN fiber as a template,carbon source and nitrogen source to prepare TiO2/carbon(C,N-TiO2)composite fibers.The C,N-TiO2 composite fibers were characterized by TEM,SEM,XPS,XRD,Raman,IR and ultraviolet-visible spectroscopy.The composite fiber exhibited strong photocatalytic activity on Rh B solution under an ultraviolet-visible light.Doping carbon and nitrogen into the titanium dioxide material can reduce the band gap width of titanium dioxide and expand the light absorption range.The carbon fiber inside the composite fiber promotes the transfer of photoelectrons and inhibits the combination of photogenerated electrons and holes.The large specific surface area of C,N-TiO2 composite fibers is also beneficial to photocatalytic activity.In the experiment,CNTF-2 degraded rhodamine B solution under 500W high-pressure mercury lamp for 4 h,the degradation rate reached 99%.C,N-TiO2 composite fiber is easy to recycle.Therefore,C,N-TiO2 composite fibers have the potential to treat organic pollutants in water.In addition,using PAN-COOH fiber as a template,a sol-gel method was used to prepare bioactive glass,and the template was removed by calcination.By this wat,we can obtain a bioactive glass microtube with a diameter of about 15 μm.Characterizations of SEM,FT-IR and XRD of were performed on the microtube.Experiments have shown that the addition of zinc strengthens the tube wall and contributes to the formation of bioactive glass microtube structures.In the biological activity test,the microtube has obvious ability to induce the deposition of hydroxyapatite,and the biological activity is good.