The Photoelectrocatalysis Of Titanium Dioxide On Polyacrylonitrile/Carbon Black-Dimethyl Sulfoxide Solution

With the wide application and development of nanostructured materials in various countries in the world in recent years,there are more and more techniques and methods for preparing various nanostructured materials.Among them,the electrospinning method is an effective process for preparing polymer fibers with diameters ranging from nanometers to micronanometers.Compared with other methods,electrospinning methods have obvious advantages in the following two aspects:(1)The fiber prepared by the electrospinning method has a large specific surface area and has huge potential application value in new energy applications and medical fields.(2)The compounding of multi-component materials can be easily realized by the electrospinning method.However,there are many process parameters that affect the preparation of nanofiber membranes with good performance by electrospinning technology,such as voltage,flow,temperature,receiving distance,environmental factors and so on.In recent years,TiO₂semiconductor has been widely used in the field of photocatalysis.The number and size of particles are important conditions that directly affect the photocatalytic activity of TiO₂.The smaller the particle grain is,the wider the band gap and the negative potential of the conduction band increase gradually,so that it will have stronger oxidation resistance and reducing ability to promote the photocatalytic growth of electron-holes,thus improving the activity of the material and making the material more valuable in the application of semiconductor engineering.Based on this background,this topic proposes the influence of surface tension on the preparation of polyacrylonitrile(PAN)nanofiber membranes during electrospinning,and provides different perspectives for the preparation of excellent PAN nanofibers to improve the preparation of PAN fibers by electrospinning.The controllability of the electro-spinning process and the synergistic applied voltage under visible light conditions under the environment of titanium dioxide(TiO₂)in the electrospinning process can catalytically degrade PAN/CB-DMSO solution.The mechanism and potential applications of converting PAN-based nanofiber membranes into plastic membranes are studied.To provide potential application value for the preparation of new materials.This subject has mainly done the following three aspects of work:(1)Based on the electrospinning experimental platform,a set of process parameters with the best surface morphology of PAN nanofibers was screened out through single factor experiments under different conditions in the early stage,voltage 18KV,flow rate0.5 ml/h,receiving distance 15 cm,solution concentration It is 12%,the drum speed is700 rpm,and the temperature is 28?.Based on this parameter,four groups of different molecular weight PAN powders are used to change the viscosity of the PAN/DMSO solution,and then change the surface of the PAN/DMSO solution.Tension,the fiber morphology and properties determined by the experimental results are combined with Comsol Multiphysic to simulate the surface tension of PAN/DMSO solution in an electric field to analyze the effect of surface tension on PAN fibers.At the same time,the effect of TiO₂ on the photoelectrocatalysis of PAN/DMSO solution was studied.(2)In order to improve the photoelectric catalytic efficiency of TiO₂,carbon black(CB)was added to the PAN/DMSO solution to improve the conductivity of the solution.Based on the initial optimum process parameters,different qualities of CB were compounded,and the effects of different qualities of CB were studied.Dispersion effect under the same ultrasonic treatment conditions.(3)Finally,the conductivity of PAN/DMSO solution was improved after composite CB.Based on the process parameters of preparing PAN/CB composite nanofibers,the PAN/CB/TiO₂ plastic film was successfully prepared by arranging TiO₂ atmosphere in the electrospinning environment.The photoelectrocatalytic ability of TiO₂ is analyzed by field emission scanning electron microscope,X-ray powder diffractometer,Fourier infrared spectrometer,X-ray photoelectron spectroscopy,etc.,according to the theory of TiO₂ photoelectric effect,it is proposed that the TiO₂ atmosphere in the spinning environment The mechanism and potential applications that make PAN-based nanofiber membranes turn into plastic-like membranes.