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利用弱光(紫外和可见)激发Ti O2光降解污染物是拓展多相光催化实际应用的关键之一.以吸附相反应技术为基础,利用N掺杂以及共掺杂两种方式制备多组分Ti O2光催化剂,并研究其在弱光下光降解甲基橙的过程.结合紫外可见漫反射光谱、X射线衍射、X射线电子能谱以及光致发光光谱等表征手段,探索焙烧温度、N掺杂量以及共掺杂对催化剂光吸收和可见光响应拓展的影响,进而研究弱光下催化剂活性的变化规律.结果发现,N掺杂可以显著增强催化剂的光吸收,从而显著提升其在弱紫外光下光降解甲基橙催化活性,所有N掺杂催化剂的活性均优于商用P25光催化剂.N掺杂对催化剂的可见光响应拓展作用不大,因而单一N掺杂后大部分催化剂在弱可见光下没有活性,仅5%N掺杂催化剂在900℃热处理后有微弱活性.N和Fe2O3二元耦合形成的共掺杂催化剂中,两者之间的协同作用既增强了复合光催化剂的光吸收,也显著拓展了催化剂的可见光响应,因而得到了在弱可见光下具有良好活性的复合光催化剂.
The use of weak light (UV and visible) to stimulate Ti O2 photodegradation of pollutants is to expand the practical application of heterogeneous photocatalyst one of the key.Adsorption phase reaction technology as the basis, the use of N-doped and co-doped two ways to prepare multiple groups Ti O2 photocatalyst was prepared and its photodegradation of methyl orange in low light was studied. Combining with UV-Vis diffuse reflectance spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and photoluminescence spectra, the effects of calcination temperature, N doping content and co-doping on the light absorption and visible light response of the catalyst to explore the changes in the activity of the catalyst under low light conditions.The results showed that N doping can significantly enhance the light absorption of the catalyst, Photocatalytic activity of methyl orange degrades under ultraviolet light, and the activity of all N-doped catalysts is better than that of commercial P25 photocatalysts.N-doping has little effect on the visible light response of the catalysts, so most of the catalysts after single N-doping are weak No visible light activity, only 5% N-doped catalyst after heat treatment at 900 ° C weak activity of N and Fe2O3 binary coupling formed co-doped catalyst, the synergy between the two enhanced Composite photocatalyst light absorbing, expanded significantly in response to visible light of the catalyst, thereby obtaining a compound having good activity in the weak visible light photocatalyst.