｛001｝TiO_2纳米片的制备及不同含F量对其光催化活性的影响

Synthesis of Titania Nanosheets with Exposed {001} Facets and the Influence of F Content on Its Photocatalytic Property

以钛酸丁酯为钛源、HF为形貌控制剂,采用简单的水热法合成了具有高催化活性表面的{001}面纳米TiO2。利用X射线衍射、紫外-可见光漫反射光谱及透射电镜等技术对样品形貌和结构进行表征,并以罗丹明B的光催化降解为模型反应,考察了不同HF量对{001}面TiO2光催化活性的影响。结果表明,{001}面TiO2具有良好的锐钛矿晶型,为纳米片层结构,在紫外光下具有较{101}面TiO2更高的光催化活性,且随着F含量增加,其光催化活性先逐渐增加后减小,F/Ti物质的量比为1.25时其光催化活性最高,紫外光照射20 min后罗丹明B降解率可达80%以上。

A series of anatase TiO2 with exposed {001} facets were synthesized by a simple hydrothermal route using tetrabutyl titanate as a titanium source and HF solution as the solvent.The prepared catalysts were characterized by X-ray diffraction,UV-vis diffuse reflectance spectroscopy and TEM techniques.The photocatalytic activities of the samples were evaluated by rhodamine B degradation.The influences of different amounts of HF were investigated.The nanosheets exposed {001} facets had good anatase crystal and showed a high photocatalytic activity under UV irradiation.With an increase in the F content,the photocatalytic activity first increased,and then decreased gradually.When F/Ti molar ratio was 1.25,the photocatalytic degradation efficiency of rhodamine B was above 80% under UV irradiation for 20 min.