氮掺杂TiO_2纳米管/高岭土复合光催化剂的制备及光催化性能

Preparation and Photocatalytic Properties of Nitrogen-doped Titania Nanotubes/Kaolin Composite Photocatalysts

以P25纳米TiO2为原料、尿素为氮源,通过水热法合成氮掺杂TiO2纳米管;同时以高岭土为载体,采用浸渍法制备氮掺杂TiO2纳米管/高岭土复合光催化剂。采用X射线粉末衍射、Fourier变换红外光谱、紫外-可见光谱和透射电子显微镜等表征样品的结构与形貌,并以甲基橙为模型化合物研究复合材料的光催化性能。结果表明:制备了锐钛矿和金红石混晶型的氮掺杂TiO2纳米管/高岭土复合光催化剂;在300 W的中压汞灯照射60 min后,复合光催化剂对甲基橙的降解率高达90.2%;样品的吸光带红移至可见光区,表明氮掺杂TiO2纳米管/高岭土复合光催化剂有望成为可见光催化剂。

Nitrogen-doped titania nanotubes（N-TNTs） were prepared by hydrothermal method using P25 as raw materials and urea as a nitrogen source.The N-TNTs/kaolin composite photocatalysts were prepared by impregnation method.Structure and morphology of resulting samples were characterized by X-ray diffraction,Fourier transform infrared spectroscopy,ultraviolet–visible spectropho-tometry,and transmission electron microscopy.Photocatalytic properties of the composite materials were tested using methyl orange as a model compound.Results show that the N-TNT/kaolin composite photocatalyst is anatase mixed with rutile.After irradiation for 60 min under a 300 W middle-pressure mercury lamp,degradation rate of methyl orange solution using N-TNT/kaolin as a catalyst can reach 90.2%.The N-TNT/kaolin sample has an evident adsorption peak in the visible range.This suggests that the N-TNT/kaolin is a promising photocatalytic material for organic pollutant degradation under the visible light.