Preparation Of TiO₂ Composite Catalyst And Study Of The Degradation Of Sulfamerazine Under Visible-light

Pollution of the water environment is one of the most severe problems facing mankind today.Environmental protection and sustainable development have become important issues that people must solve.The extensive use and discharge of sulfa drugs have caused serious pollution to the environment.Long-term exposure to natural water bodies may induce the production of super bacteria,which may cause incalculable harm to humans and ecosystems.As a branch of green chemistry,photocatalytic technology is an emerging research field developed in recent years.The preparation and application of photocatalysts with high catalytic activity and full utilization of sunlight have become a hot topic of widespread concern and research.In this thesis,we focused on the preparation and characterization of TiO₂/C_xsystem and TiO₂/g-C₃N₄system composite materials for the difficult degradation of sulfa drugs,and the effect of visible light on the antibiotic sulfamerazine,which is widely present in the water environment.The degradation performance.The main research results and innovations of this paper are as follows:（1）Using titanium trichloride as the titanium source,the solvothermal calcination method was used to prepare nano-flower-like titanium dioxide microspheres.The prepared nanoflower titanium dioxide microspheres and commercial P25 were at different p H values.The following is a comparative study on the catalytic performance of materials.（2）Using titanium trichloride and melamine as raw materials,using the glycol solvothermal-calcination method,a special heterostructure material of nanoflower TiO₂and layered g-C₃N₄was prepared.The effect of the TiO₂/g-C₃N₄molar ratio and the p H value of the reaction system on the catalytic performance of the material was systematically studied.Through a variety of characterization methods and experimental means,the degradation mechanism of composite materials degrading sulfamerazine under visible light was explained.（3）Nano-carbonaceous microspheres prepared by hydrothermal method as the precursor,and nanoflower TiO₂microspheres prepared with titanium trichloride as the titanium source were calcined for different lengths of time to prepare TiO₂/C_xcomposites with gradually changing morphology material.A variety of characterization methods are used to prove and discuss the effects of C content,reaction temperature,reaction time,etc.on the composition,structure and catalytic performance of the composite,and explain the formation mechanism of the composite material and the reaction mechanism of photocatalytic degradation of sulfamerazine.