Photocatalysis of N/Fe Co-Doped TiO2under Visible Light

摘要

TiO2 is an effective pohocatalysts.However,it works only under ultraviolet light.Co-doping can improve the properties of TiO2 under visible light.Pure and co-doped TiO2 catalysts with various amounts of N and Fe were prepared by a sol-gel method.The photo-degradation of ammonia under visible light on the catalysts was investigated.The result showed that the photocatalytic activity of co-doped TiO2 prepared with the conditions of 1at ％ N,0.06 at％ Fe,calcinated at 500 oC,was the highest.The influence order of the factors on catalyst photocatalytic activity was Fe ＞ N ＞ calcination temperature.The transfer from the anatase phase to the rutile phase for TiO2 was weakened as the co-doping of N and Fe.The capture of excited photo-electrons by Fe played an important role in enhancing the ability of TiO2 while doping N was responsible for broadening the spectrum response range of TiO2 to visible light.