Study On The Construction And Performance Of TiO₂/PVP Hybrid Fiber Materials By Electrospinning

Electrospinning is a kind of polymer solution or melt which has the effect of the electric field force for the injection of the fiber and the spinning method of nano scale fiber is obtained.It is one of the most promising methods for the preparation of nanofibers.Electrostatic spinning nanofiber has great specific surface area,in the forming of the net mat with many pores,so it has very strong adsorption force and good filtering,barrier property,adhesion,and thermal insulation,and other characteristics.The nanofiber can be used in the fields of enhancing the composites,biological applications,nano electronic devices and so on.In recent years,Electrospinning,as a new technology for producing photocatalytic materials,has become a hot topic in recent years.The technology is applied to biomedicine,filter materials and photocatalysis.The nanofiber membranes are prepared by electrospinning.Titanium dioxide?TiO₂?is an important inorganic chemical product.In addition to the high photocatalytic efficiency,nano-TiO₂fiber also has energy-saving,non-toxic,no secondary pollution,acid and alkali resistance,high recycling rate,and many other advantages.It has broader application prospects in the purification of air,degradation of water pollutants,and other aspects.Therefore,the effect of nano-TiO2hybrid fiber and its modification on the photocatalytic performance was studied.TiO₂/PVP hybrid fibers are made by electrospinning at first.And then TiO₂inorganic nanofibers were prepared by calcining of TiO₂/PVP hybrid fibers.Moreover,the effects of PVP concentration and electropinnging voltage on the morpholgies,diameter and diameter distribution of TiO₂/PVP hybrid fibers and the TiO₂nanofibers were systematically investigated respectively.Finally,the photocatalytic efficiency of samples was evaluated by degradation of methylene blue.The following conclusions are obtained as follows:?1?The PVP solution has good spinnability in the concentration range from 14 wt%to 22 wt%,and the diameter and diameter dispersion of the TiO₂fibers gradually decrease with decreasing the PVP concentration.?2?Increasing the spinning voltage,the fiber diameter decreases first and then increases,but the growth trend becomes slower.?3?TIO₂/PVP nanofibers were prepared by solution-gel method with a concentration of 16%.The photocatalytic degradation rate of methylene blue was 92.26%under UV irradiation for 50 min.Second,TiO₂-Mo S₂/PVP hybrid fiber membranes were prepared by electrospinning using isopropyl titanate as the titanium source in this paper.Then the properties ofElectrospun film and heat treated inorganic fiber were investigated by Xrd,SEM and so on.The results show that:at first,the fiber diameter decreases with the increase of isopropyl titanate,but the diameter distribution does not change significantly.At second,After heat treatment,the diameter of the treated inorganic fibers became smaller,the diameter distribution became wider and the titanium dioxide crystallization became more obvious.Finally,the TiO₂-Mo S₂/PVP hybrid fiber membrane with 8.28%PVP concentration was modified by Molybdenum disulfide,and the final degradation rate of Methylene blue was 96.82%after 45 min of UV irradiation.In the third stage,titanium dioxide-GO/PVP hybrid fiber membranes and blank samples were prepared by electrospinning.The morphology of the membranes was characterized by scanning electron microscopy?SEM?.At last,the photocatalytic properties of the hybrid fibre films of titanium dioxide-GO/PVP were characterized by testing the photocatalytic properties of the films.The XRD pattern shows that there is no formation of titania crystals before calcination,and anatase crystal is formed after calcination.According to SEM,the fiber diameter before firing is larger than after firing,and the fiber significantly curled after firing.The degradation rate of Methylene blue was increased with the increase of titanium dioxide content,and the maximum degradation rate was 96.17%at 39 min for Methylene blue.