| With the development of society,the problems of environmental pollution and energy shortage are becoming more and more serious.Semiconductor photocatalysis technology has become an important means to solve environmental pollution problems.Titanium dioxide(TiO2)semiconductor catalyst has the advantages of non-toxicity,high photocatalytic activity and good chemical stability,which has aroused intense research interest of researchers.However,TiO2 also has the disadvantages of wider band gap and higher recombination rate of photogene rated electrons and holes.In order to solve these problems effectively,the Inverse opal(10)TiO2 was prepared by changing the shape of TiO2 monomer to improve the photocatalytic efficiency.While exploring the composite modification with g-C3N4 to further enhance the photocatalytic efficiency.In this paper,firstly,polystyrene(PS)and silica(SiO2)microspheres were success Fully prepared by soap-free emulsion method and improved Stober method;Then,the PS and SiO2 photonic crystal templates were successfully prepared by vertical sedimentation method;And inverse opal TiO2 was prepared Successfully by sol-gel method.The microspheres,photonic crystal templates and Inverse opal TiO2 were characterized by XRD,SEM,TEM,EDS,UV-vis et.al.Their photocatalytic properties was tested also.Fhe results show that Inverse opal TiO2 is anatase type,and the Inverse opal TiO2 prepared by 320 nm microspheres has the highest degradation rate of methylene blue after simulating sunlight for 3 hours,reaching 92.3%.In order to further improve the photocatalytic efficiency.We prepared 10-TiO2-g-C3N4 by dipping method for the first the.After photocatalysis experiments,it was founded that the IO-TiO2-g-C3N4/6h composite photocatalyst prepared by immersing 10%urea in mass fraction for 6 hours then calcined at 550? for 1 hour under nitrogen protection showed the highest pholotcatalytic performance.The dcgradation rate of methylene blue reached 98.7%after 3 hours of simulating sunlight. |
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