Controllable Synthesis And Photocatalysis Of Highly Active Titanium Dioxide

In recent years,the problem of energy shortage and environmental pollution is one of hot spots in the world.The photocatalytic oxidation technology of using semiconductor materials,as a new environmentally friendly technology,has unique advantages in the development of new energy and environmental governance.And it is also increasingly paid attention by researchers.TiO₂,as the most widely studied photocatalytic material in recent years,plays an increasingly important role in photodegradation.In this paper,we mainly explore the photocatalytic properties of titanium dioxide by adjusting the morphology under different conditions.At the same time,it lays a good foundation for the further study of the preparation of titanium dioxide-based heterojunction composites.In the content of the first chapter,we mainly introduce the related situation of photocatalytic materials,and briefly introduce the structure,photocatalytic mechanism and development status and problems faced of titanium dioxide.We also summarized the method of synthesis.The paper summarized and put forward the research ideas and exploration contents of this thesis.In the content of the second chapter,we mainly use the typical solvothermal method to prepare the flower-like TiO₂ structure with oxalic acid solid as template,and explore the effect of high temperature calcination on the morphology of TiO₂.Growth proposed a reasonable growth mechanism and explored the photocatalytic effect of the sample.In the content of the third chapter,we successfully prepared the spherical titanium dioxide assembled by nano-sheets with one-step hydrothermal method without template.The morphologies and characteristics of the samples were effectively determined by various equipments.In addition,we describe the conditions of the different growth stages of the sample.The electrochemical properties of each sample were characterized by photocurrent testing.In the content of the fourth chapter,we prepared nano-sphere TiO₂ by means of glucose and ammonium fluorotitanate,and characterized it by light catalysis,and understood the performance of the sample.In the content of the fifth chapter,we use the electrospinning technology to prepare the one-dimensional nanofiber material TiO₂ with PVP as the binder.On the one hand,the structure and morphology of the sample are characterized by instruments and equipment.On the other hand,the photocatalytic performance of the sample was simply tested.We analyzed its photocatalytic effect under UV-vis light.In the content of the fifth chapter,we mainly provide a brief overview of a series of work during the three-year master's degree.And we make initially plan for the future experimental content and the subsequent program to continue to explore.A brief summary of the main innovations of this topic was also made.In this paper,the main research focus is to use a simple solvothermal method to explore a variety of unique morphologies of titanium dioxide structure.We also made a simple systematic characterization for their photocatalytic properties.It provides a good experimental basis for photocatalytic and electrochemical applications which for the preparation of highly active heterojunctions based on titanium dioxide.At the same time,it also provides an important theoretical basis for the development of semiconductors.