| In this paper,using sol-gel method,butyl titanate as precursors,anhydrous ethanol as solvent and acetylacetone as hydrolysis inhibitor,urea as nitrogen source,ordinary glass as carrier,preparation of supported nitrogen-doped titania,The optimal preparation conditions of the supported nitrogen-doped titania in the photocatalytic reaction under UV light and visible light were optimized respectively.The pH value of the sol,the doping amount of the nitrogen element(the quality of the urea The effects of the three response factors on the photocatalytic effect were analyzed by comparing the effects of the three reaction factors and the calcined temperature.The effects of the three response factors on the photocatalytic effect were analyzed.The kinetic equation of the photocatalytic reaction was deduced and verified.The photocatalytic degradation experiment was carried out under different conditions of natural light under the conditions of optimized conditions.The effects of different weather conditions on the photocatalytic reaction were analyzed.The main conclusions are as follows:(1)The optimum results of sol pH,nitrogen doping(in terms of urea mass)and calcination temperature were 6.94,0.72 g and 472.60 ?,respectively.The optimized results were 7.27,0.7g and 434.03?,respectively.The effect of the regression equation was significant and the mismatch was not significant.The interaction effect between the pH value of the sol,the doping amount of the nitrogen and the calcination temperature was significant.The samples were prepared according to the optimized conditions and the experiment was carried out under the corresponding conditions.The results are expected to test the junction error rate is less than 0.3%.(2)The load and load stability of supported nitrogen-doped TiO2 prepared under different preparation parameters were tested.The samples were characterized by SEM,XRD,DRS and FT-IR.The pH of the sol was analyzed.Doping amount and calcination temperature on the loading effect,apparent trait,functional group and microstructure of supported nitrogen-doped TiO2.The results show that the pH value of the sol has a great influence on the apparent properties of the supported nitrogen-doped titania,and the lower sol pH will seriously reduce the loading and load stability of the supported nitrogen-doped titanium dioxide.The results show that the maximum absorptionwavelength of titanium dioxide is red-shifted,and the red shift degree increases with the increase of the amount of nitrogen element doping,while the other conditions are the same,the photocatalytic efficiency with nitrogen The increase of the doping amount of the element increases first and then decreases,and the doping amount of the nitrogen element has some influence on the functional group composition of the titanium dioxide.The calcination temperature has a significant effect on the crystal form of the titanium dioxide,and the temperature is too low or too high,,The content of rutile titanium dioxide increases,while the anatase phase content is relatively reduced,and when the anatase phase in the overall component occupies a higher content can have a high photocatalytic activity.(3)The kinetic equation of photocatalytic reaction is deduced and deduced,and the samples prepared by the optimized conditions under ultraviolet light and visible light are validated under the corresponding light source.The results show that the supported nitrogen-doped titania under two kinds of light sources The photocatalytic reactions follow the Langmuir-Hinshelwood first-order kinetics equation.The two samples were tested with undoped nitrogen under the same conditions in the sunny,cloudy and haze weather.The results showed that the photocatalytic effect of supported nitrogen-doped titania in haze weather The best conditions for the preparation of supported nitrogen-doped titania prepared under visible light are the most suitable for photocatalytic reactions in natural light. |
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