二氧化钛纳米管的制备及其光催化性能

为提高TiO_2的光催化性能,通过电化学阳极氧化法在金属钛箔基体上制备了结构有序的TiO_2纳米管(TiO_2NTs),并以此为基础通过连续离子层吸附反应技术(SILAR)制备了Ag、CdS共修饰的TiO_2纳米管(AgCdS/TiO_2NTs)。采用X射线衍射仪、扫描电子显微镜、透射电子显微镜、元素分析仪和紫外可见漫反射光谱等表征手段,对Ag-CdS/TiO_2NTs形貌结构、元素组成和光吸收特性等进行了表征,并研究了Ag、CdS修饰后的TiO_2纳米管的光催化性能。结果表明:Ag和CdS纳米粒子被成功沉积在TiO_2纳米管上;与纯TiO_2纳米管的吸收光谱相比,Ag-CdS/TiO_2NTs对光的吸收范围延伸到整个可见光区域;与纯TiO_2纳米管或CdS修饰的TiO_2纳米管相比,Ag(3)-CdS/TiO_2NTs对甲基橙脱色率最高,70 min后脱色率达100%。

Preparation and photocatalytic property of TiO2 nanotubes

In order to improve the photocatalytic property of TiO2,TiO2 nanotubes (TiO2 NTs) were firstly synthesized on the titanium foil substrate by electrochemical anodic oxidation process,and Ag and CdS co-modified TiO2 nanotubes (Ag-CdS/TiO2 NTs) were prepared by successive ionic layer adsorption and reaction (SILAR).The phase composition,morphology and optical properties of the samples were characterized by the X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,energy-dispersive spectroscopy and UV-Vis diffusion reflection spectroscopy,and its photocatalytic activity was also studied.The result indicated that Ag and CdS nanoparticles are successfully deposited on the TiO2 NTs.Compared with the absorption spectra of the TiO2 NTs,the AgCdS/TiO2 NTs extendes the light absorption range to the whole visible-light region.Ag-CdS/TiO2 NTs has higher degradation rate of methyl orange (MO),compared with CdS/TiO2 NTs or pure TiO2 NTs.