Preparation, Characterization And Application Of TiO₂Nanomaterials Based Anatase

With the rapid development of industrial, the sharp increase of world population,"energy" has gradually become the focus of symbol and competition of every nationalstrength. The heavy use of energy not only brings human prosperity and civilization,but also has great influence on the human living environment and social stability.Seeking for low cost, high efficiency and non polluting green new energy and newmaterials has become an important way of the human sustainable development.Nanometer material is not only the first choice of electrode material of lithium ionbattery energy-a new kind storage equipment, but also can be used as photocatalystof degrading pollutants to mitigate environmental crisis, which has multiplesignificance to solve the energy crisis and environmental pollution. And duringnumerous nanometer materials, because of its high safety coefficient, structurestability, non-toxic, inexpensive and other characteristics, TiO2has become the mainresearch object studied by domestic and foreign researchers.When TiO2is used as anode material of lithium ion battery, its theoreticalcapacity is168mAh g-1and the specific capacity is relatively low; Used asphotocatalyst which has the disadvantages of wide band gap and high absorption oflight threshold. When prepare nano-TiO2, due to the complication andtime-consuming of preparation process，it is easy to produce agglomeration thus toaffect its optical properties, which is not suitable for commercial production.In thispaper,according to these shortcomings, based on TiO2preparation technology ofsol-gel combined with hydrothermal method, use sol combined with solvent thermalpreparation method to prepare anatase TiO2which has uniform particle size and gooddispersion, then study its photocatalytic and lithium battery performance.The main research content and results are as follows:1.Use tetrabutyl titanate as precursor, ethanol as solvent, nitric acid as inhibitorand sol-gel combined with hydrothermal method to prepare nanometer TiO2materialsand on this basis,adding anionic surface active agent-C18H29NaO3S as dispersingagent, Prepare nanometer TiO2material by using the method of direct solvent heat treatment after sol partial hydrolysis. With the degradation rate of the photocatalyticdegradation of methyl orange as the standard, the design of orthogonal experiment todetermine the optimal process parameters. Useing the degradation rate ofphotocatalytic degradation of methyl orange as the standard, design orthogonalexperiment to determine the optimal process parameters. Besides, use X raydiffraction analysis to determine the crystal type of the samples and TEM and SEM toobserve the surface of the samples. After continuous chemical reaction for6days at150℃，the weight ratio of SDBS to Ti(OR)4was1:30, and being calcinated for4h at450℃, TiO2nanoparticles is pure anatase phase which size is approximately20nm orless and has better dispersion.2.Using methyl orange as degradation compounds, carry out a series ofphotocatalytic experiment on TiO2samples to study how two kinds of synthesisprocess and the existing of surface active agent influence the photocatalytic propertiesof the samples. Experiments showed that TiO2has higher catalysis efficiency preparedby sol combining with solvent thermal with the participation of surface active agent.And after degradation for60min, the degradation rate can reach99.5%. Besides，study the influence of different process parameters in sol combined with solventthermal on photocatalytic TiO2performance.3.Study the influence of preparation technology and surface active agentsodium-SDBS on the electrochemical properties for nano-TiO2comparatively atoptimum conditions. Experimental result showed that TiO2prepared by solsolvothermal method has better cycle stability. At0.2C, the first charge specificcapacity is190.4mAh g-1. After circulating100laps, the specific capacity is almostno damping. Besides, further investigate the influence of reaction temperature andreaction time of sol bonded solvent thermal method on TiO2lithium batteryperformance. Research showed that, reaction temperature and reaction time will affectmaterial particle size, regularity of shape and dispersity, which will have an impact onthe electrochemical performance.