固相合成N/Fe共掺杂TiO_2及可见光降解葛根素

Solid phase synthesis of N/Fe co-doped TiO_2 materials and visible light degradation of puerarin

采用简单固相反应法分别合成了铁掺杂二氧化钛(Fe-TiO2)及氮和铁共掺杂二氧化钛(N/Fe-TiO2)光催化粉体材料,并对材料进行了X射线衍射(XRD)、紫外-可见光光谱(UV-Vis)、X射线光电子能谱(XPS)等物相结构及元素组成表征,同时研究了材料对葛根素的可见光降解性能。结果表明,N和Fe进入了TiO2晶格,紫外-可见漫反射吸收光谱红移到600nm。在20℃、pH=6.5条件下,所制得的光催化材料对葛根素的可见光降解行为均具有较高的光催化活性,并服从一级反应动力学规律。催化剂对葛根素的可见光降解速率常数N/Fe-TiO2>TiO2>Fe-TiO2。

The photocatalytic powdered materials,Fe-doped TiO2（Fe-TiO2） and N,Fe co-doped TiO2（N/Fe-TiO2） have been successfully synthesized respectively,through a simple solid-state reaction process.The textural properties of the samples are characterized by X-ray diffraction（XRD）,ultraviolet visible light spectroscopy（UV-Vis）,and X-ray photoelectron spectroscopy（XPS）.Moreover,the photodegradation properties of puerarin irradiated under visible light on the materials are studied.It clearly shows that N and Fe have been incorporated into the lattice of TiO2.Interestingly,the UV-Vis displays that the adsorption band of N/Fe-TiO2 material shifts to 600 nm.Under the conditions of 20 ℃ and pH=6.5,the produced photocatalytic material has pretty high photocatalytic activity on the visible photodegradation of puerarin,and obeys the first grade reaction kinetics rules.The visible light degradation reaction rate constants of catalysts are as the following sequence：N/Fe-TiO2〉TiO2〉Fe-TiO2.