Study Of Titanium Dioxide Photocatalytic Properties By Modified Morphology Regulation/metal Oxide

At present,the world is facing two major problems,one is the energy crisis and the other is the problem of environmental pollution.In semiconductor photocatalysts using solar energy to convert them into chemical energy is one of the effective ways to solve these two problems.Among them,titanium dioxide?TiO₂?is the most widely studied semiconductor material.Its chemical properties are stable,non-toxic,and it has the advantages of good degradation of organic pollutants.It has been widely used in gas sensing,solar cell sensitization,and degradation of organic pollutants.And other fields.However,there are also many problems in practical application of titanium dioxide:because titanium dioxide is a wide band gap semiconductor material,it has a narrow absorption range for sunlight and can only absorb energy in the ultraviolet-near ultraviolet region;defects such as photo-generated electron-hole pairs are extremely easy to recombine,Therefore,it is one of the current research focuses to improve the titanium dioxide and improve the photocatalytic activity.This article mainly focuses on the aspects of morphology control and metal oxide modified titanium dioxide.?1?The first part of the work mainly uses magnetic field-assisted electrostatic spinning to prepare ordered TiO₂ nanomaterials.The ordered structure can increase the electron transfer rate and thus improve the photocatalytic activity.In this paper,by improving the traditional high-voltage electrostatic spinning station,two bar magnets are added below the receiving board of the spinning station to regulate the voltage of the high voltage DC power supply,the distance between the nozzle and the receiving board,and the bar magnet.The titanium dioxide nanofibers and nanotubes were prepared in order,such as the distance between them,the magnetic field strength of the magnet,and the ratio of the precursor fluid.Degradation experiments of 10%rhodamine B for organic pollutants have found that the ordered titanium dioxide nanofibers have a degradation effect of 8.4%higher than the disordered nanofibers,and the ordered titanium dioxide nanotubes have an degradation effect of about 2.9%than the disordered nanotubes.?2?The second part is the preparation of p-n heterojunction structure using TiO₂.The heterojunction structure can effectively inhibit the recombination of electron-hole pairs,thereby improving the photocatalytic activity.Ag₂O/TiO₂ nanomaterials are prepared by a two-step method.First,TiO₂ nanotubes are prepared by high-pressure electrostatic spinning,and then TiO₂ nanotubes are added to a silver nitrate solution by a wet chemical method,and then added to hydrogen In sodium oxide solution,samples can be obtained by washing and drying,and the optimal silver nitrate concentration can be found by degrading rhodamine B,that is,20 mL silver nitrate solution with a silver nitrate content of 0.05 mol is selected to perform the best wet chemical experiment.Using rhodamine B as a degradation dye,it was experimentally determined that the Ag₂O/TiO₂ nanocomposite can degrade rhodamine B solution with a concentration of10%by 94.7%within 80 minutes.