The nano-TiO2 microspheres were prepared using TiCl4 and CON2H4 as raw materials by a simple sol-vothermal method.XRD,FESEM,TEM,UV-vis,BET methods were used to directly analyze the composi-tion,structure,morphology,optical properties and specific surface characteristics of the samples.The photo-catalytic activity of the microspheres prepared with different solvothermal time was determined by analyzing the degradation of gaseous benzene.The results show that the TiO2 microspheres have undergone a process of TiO2 solid-core,core-shell and hollow-center structure with the extension of reaction time,but they are all composed of particles below 20 nm.The light absorption band edge of the microspheres exhibits a significant"blue shift"phenomenon,the light absorption performance is higher than P25 TiO2,and the specific surface area is 3-5 times higher than that of P25 TiO2.The core-shell structure microspheres prepared by 6 h exhibit the highest photocatalytic activity,the mineralization rate of degraded gaseous benzene is as high as 93％,which is nearly three times higher than P25 TiO2.The excellent performance may ascribe to the sufficient reflection and absorp-tion of light by the core-shell structure,and the adsorption synergistic photocatalytic properties by the high spe-cific surface area.
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