Modification Of TiO₂ And Preparation And Performance Of Carbon Aerogel Based On Photocatalysis

With the rapid development of global industrialization,the demand for energy and materials is also increasing,and the global environmental problems are also deteriorating.As an efficient environmental protection technology,photocatalysis has broad application prospects in the field of environmental pollution,especially water treatment.Nano-TiO₂ stands out among the semiconductor photocatalysts due to its outstanding photocatalytic performance,stable chemical performance,non-toxicity,high reutilization rate,etc.,and is widely usedThe high photocatalytic performance of nano-TiO₂ photocatalyst is limited to ultraviolet light,and its light response range is narrow.Photogenerated electrons and holes on its surface are more likely to recombine,resulting in a lower conversion rate of solar energy.These defects are an important reason for restricting the further improvement of nano-TiO₂ photocatalytic activity.The main research contents and conclusions of this paper are as follows:?1?Nano-TiO₂ was prepared by solvothermal method,using methylene blue as simulated waste liquid.Optimize the best preparation process by exploring the influence of different preparation conditions on its photocatalytic performance.X-ray diffraction analysis,scanning electron microscopy analysis,transmission electron microscopy analysis,specific surface area and pore size analysis were used to study the structure and morphology of the obtained samples.The results show that when the solvothermal temperature is 160°C,the reaction time is 6h,the calcination temperature is 450°C,and the calcination time is 4h,the obtained sample is a microsphere formed by stacking nanocrystals,the particle size is small and the dispersion is relatively good,and its photocatalytic performance is the best,the degradation rate under ultraviolet light reaches 99.50%in 2h.?2?The carbon aerogel was prepared by the sol-gel method,X-ray diffraction analysis,scanning electron microscopy analysis,transmission electron microscopy analysis,specific surface area and pore size analysis,infrared spectrum analysis and other characterization methods were used to study the microstructure of the obtained carbon aerogel.The results show that the size of the R/C value?catalyst content?directly affects the size of the carbon aerogel particles.As the R/C value increases,the carbon aerogel particles increase,the average pore volume and pore size increase,and the degree of graphitization decreases.when R/C=800,the specific surface area of carbon aerogel is the largest.Preliminary research was carried out in the research of carbon aerogel loaded TiO₂,the basic conditions of the load test were obtained,and the prepared series of composite materials were characterized by XRD,the results show that under a certain molar ratio,the obtained composite material can simultaneously observe the characteristic peaks of TiO₂ and carbon aerogel,when nTiO₂:nCA=2:1,the peak of the carbon aerogel is hardly observed,the possible reason is that excessive TiO₂ coats the carbon aerogel...