Research On Photocatalytic Degradation Of Organic Pollutant On W Doped TiO₂ And TiO₂ By Doping With W And N

TiO2 semiconductor materials because of its high photocatalytic activity and the advantages of cheap accessible in environmental governance and semiconductor catalyst has been widely concerned.But because of TiO2 to absorb ultraviolet light,and light only high electron-hole recombination rate greatly limits its application in real life.In order to make the TiO2 can better absorb sunlight and lower light electronic-hole recombination rate,so as to improve the photocatalytic activity,this paper through the hydrothermal method W doping and W-N doping of TiO2 photocatalyst.Under uv and visible light,respectively,aiming at acid orange and rhodamine B degradation on the preparation of catalyst performance testing.Doping concentration and explores the different W W-N doping on the properties of TiO2 photocatalytic effect.Combined with XRD,SEM,BET,XPS and UV-Vis absorption spectra of the testing method is discussed of the TiO2 doped crystal structure,morphology,and the influence mechanism of photocatalytic activity.The results show that the low concentration of W doping can improve TiO2 in ultraviolet catalytic activity;The doping can expand the TiO2 absorption wavelength of N elements;W-N doped TiO2 is single element doped with relatively high photocatalytic activity can effectively restrain ion doped W light electronic-hole compound;Gap that exists in TiO2 lattice doping and substitution of N atoms can effectively reduce the forbidden band width of TiO2;And W-N doping TiO2 will absorb visible light through synergy,and gain higher photocatalytic activity.The PDE reached 63%within 120 min and reached 98%within 220 min for codoped TiO2 with the ratio of the amount of substance n(W):n(Ti)= 0.2%.