The Construction And Modification Of TiO₂ Single-crystal Nanorods

Photocatalyst based on titanium dioxide（TiO₂）,Which lead quantization production low yield,slow reaction rate and poor ability of utilizing solar energy and severely limit its further application,by doping or the introduction of low level material can effectively improve the photocatalytic performance of TiO₂.Compared with the polycrystalline titanium dioxide,TiO₂ single crystal because of its internal crystal structure continuous and orderly,high electrical conductivity and low electron transfer resistance,Which provides direct path for effective separation and transfer optical carrier and the decomposition of organic matter.However,compared with polycrystalline TiO₂,single crystal TiO₂ is more difficult to achieve effective doping and modification.Therefore,this paper has carried out a series of work on the controllable synthesis of TiO₂ single crystal nanorods and its performance.In terms of the preparation of titanium dioxide single-crystal nanorods,this paper adopts the cationic polystyrene（CPS）and titanium dioxide core-shell structure（CPS@TiO₂）as precursor,then water fluid,by raising the temperature of the control program,using the CPS and TiO₂ for a good contact,finally use calcining,implements the in situ preparation of carbon doped TiO₂ single-crystal nanorods,effectively overcome the existing preparation carbon doped TiO₂ need additional disadvantage of carbon precursor.Compared with commercial P25,the prepared carbon doped TiO₂ can improve the ability of the visible light degradation organic pollutants such as rhodamine B and nitrophenol.Although the carbon doped TiO₂ single-crystal nanorods can improve the photocatalytic performance of TiO₂ effectively,its optical performance is limited due to its low carbon content.Therefore,on the basis of above,this paper further introduces the modified Fe2O3 with good visible light performance,and develops the TiO₂ single crystal photocatalyst modified by Fe₂O₃（Fe₂O₃/TiO₂）.In this paper,the creative use of TiO₂single-crystal nanorods as a template,four iron oxide by impregnation method,adsorption,finally by the calcination temperature programmed,Fe₂O₃ and TiO₂ achieved good fusion,effective implementation of Fe₂O₃ and TiO₂ level match,to overcome the traditional Fe₂O₃ and TiO₂ due to the energy level difference is too large（about 1 eV）to obtain high visible light activity and difficult to Fe₂O₃/TiO₂ composites.The photocatalytic experiment shows that the photocatalyst of Fe₂O₃/TiO₂ has better ability to degrade nitrophenol than the carbon doped TiO₂ single crystal.Therefore,this paper puts forward the carbon doped TiO₂ single-crystal nanorods and Fe₂O₃ modified TiO₂ as light catalyst preparation method,to guide the preparation of other semiconductor doped or modification of the visible light catalyst,has provided the experimental data and theoretical basis.