CuO/TiO_2异质多孔纳米结构的制备及其光催化性能

以Cu(OH)_2纳米棒阵列为前驱体,钛酸四丁酯为钛源,采用外向包覆合成法,利用Cu(OH)_2自身热分解产生的微量水分子与负载在其表面的钛酸四丁酯缓慢反应,制备了CuO/TiO_2异质多孔纳米结构,并研究了产物对罗丹明B(RhB)的光催化降解性能。结果表明,得到的产物薄膜为直径2~4μm的微孔组成的多孔纳米结构,微孔的孔壁由直径500nm左右的纳米棒组装而成。产物CuO/TiO_2异质多孔纳米结构比纯TiO_2纳米结构对RhB有更好的光催化降解性能,这主要是由两方面的原因引起的:一方面,CuO/TiO_2异质多孔纳米结构具有更好的吸附性能和更大的比表面积;另一方面,产物CuO/TiO_2为异质复合纳米结构,异质结的存在能有效地降低光生电子空穴对的复合,从而提高产物的光催化降解效果。

Fabrication and Photocatalytic Performance of CuO/TiO2 Heterogeneous Porous Nanostructures

CuO/TiO2 heterogeneous porous nanostructures have been synthesized through an outward coating process using Cu(OH)2 nanorod array as precursor and Ti (OC4H9)4 as Ti sources,and the photocatalytic performance of degredating Rhodamine B (RhB) dye solution were studied.The experimental results show that the CuO/TiO2 products exhibit porous structures,and the diameters of the pores are around 2～4μm.The wall of the pores is constructed by nanorods with diameters around 500nm.The CuO/TiO2 porous nanostructures show enhanced photocatalytic properties compared with TiO2 nanostructures,which is mainly attributed to better adsorption and higher specific surface area of the CuO/TiO2 porous nanostructures.On the other hand,heterojunction in the CuO/TiO2 heterostructures can effectively reduce the recombination of photo-generated electron-hole pairs,and thus enhance the photocatalytic properties of the products.