TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method comprises preparing cationic polystyrene template, adding cationic benzyl vinyl trimethylammonium chloride (VTC) monomer and styrene monomer in the mass ratio of 10-40 wt.%. The TBT is dissolved in ethanol and is added in dropwise manner. The concentration of titanate n-tetrabutyl alcohol solution is 0.025-0.2 g/ml. The concentration range is used for regulating titanium dioxide shell thickness. The greater the concentration, thicker is the shell thickness. The deionized water catalyst is added and allowing for TBT cation templates settling at adequate settling time of 24 hours. Uniformly depositing TBT on the template surface. When water is added to achieve the in situ hydrolysis there is self-assembly at the template surface. If the settling time is too short there is uneven settlement of TBT in the template surface. The TBT hydrolysis rate is fast which leads to hollow titanium dioxide dispersion preparation. The amount of deionized water is not more than 5% of the total solvent volume. The mixture of ethanol and water is added under stirring condition, where the mass ratio of ethanol and water is 1:2. If directly water is added it can cause partial hydrolysis too fast resulting in large number of microspheres reunion. Preparation of PS/TiO2 core-shell structure calcining segment temperature programming: at 25 degrees C, raising the to 250 degrees C for 250 minutes and keeping for 60 minutes, from 250 degrees C, raising the to 300 degrees C for 100 minutes and keeping for 30 minutes, from 300 degrees C, raising the to 350 degrees C for 200 minutes and keeping for 120 minutes, from 350 degrees C, raising the to 400 degrees C for 200 minutes and keeping for 60 minutes and from 400 degrees C, raising the to 450 degrees C for 200 minutes and keeping for 120 minutes, ensuring complete conversion of titanium dioxide into anatase crystal. The template cannot be completely removed. When the door in fully closed state calcined is best and ensures that the process of transformation of titanium dioxide crystalline form carbon present. The photocatalyst insitu carbon doped microspheres is titanium dioxide, dispersing, morphology ruling and particle size is mainly 450-550 nm. The catalyst has strong absorption of visible light and can be completely decomposed into intermediate Rhodamine B, water and carbon dioxide in 30 minutes. The concentration of PS template used in ethanol solution is 0.025-0.125 g/ml. The reaction sedimenting time is 24 hours and the hydrolysis time is 20-25 hours. The method comprises washing the reaction product with deionized water and ethanol alternately. The drying is carried out at 60 degrees C for 10-15 hours. The mass ratio of tetrabutyl titanate and monodisperse cation is 2-5:4.