CdS量子点沉积的钛基纳米管的制备及其光催化性能研究

Synthesis and photocatalytic activity of CdS quantum dot coupled titanate nanotubes

采用水热法制备了钛基纳米管,利用双官能团物质2-巯基丙酸为连接剂,将CdS量子点沉积在纳米管表面,研究了2-巯基丙酸浓度对样品的物相、微观结构和光催化活性的影响。利用X射线衍射仪、透射电子显微镜、紫外可见分光度计和光催化反应仪对样品进行了表征。结果表明,CdS量子点成功沉积在纳米管表面,改变2-巯基丙酸浓度可以调节CdS量子点的沉积数量,随着CdS量子点在纳米管表面的沉积,样品不仅在紫外光区有吸收,在可见光区也出现吸收,其吸收边在540nm左右。CdS量子点的沉积提高了样品在可见光下的光催化活性,2-巯基丙酸浓度为0.7mol/L时制备的样品对甲基橙降解的光催化活性最好。

Titanate nanotubes （TNTH）were prepared by hydrothermal method. Then,CdS quantum dots were de posited on the surface of the TNTH by 2-mercaptopropionic acid. The effect of 2-mercaptopropionic acid concentrations on the properties were discussed. The samples were characterized by X-ray diffraction, transmission electron microscope and diffusion reflectance UV-vis spectroscopy. The results showed that CdS quantum dots were successfully deposited on the surface of TNTH and with increasing the concertration of 2-mercaptopropionic acid,the number of CdS quantum dots was increased. The deposited CdS quantum dots broadened the absorption spectrum of the samples. The absorption edge of sampies was at 540nm which had an obvious red shift compared to TNTH. The deposition of CdS quantum clots on the surface of TNTH effectively improved the photocatalytic activity of TNTH, and there was an optimal content when the concentration of 2-mercaptopropionic acid was 0. 7mol/L.