一步水热法制备Sn2 掺杂TiO2及光催化 产氢性能研究

Preparation of Sn2 -Doped TiO2 by One-step Hydrothermal Method and Its Photocatalysis Study on Hydrogen Production Performance

摘要:

以SnCl2和钛酸四丁脂为前驱体，采用一步水热法制备了不同Sn2 含量的Sn2 掺杂TiO2光催化剂。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线能谱（EDX）、紫外-可见漫反射（UV-vis）、低温N2-吸附脱附、X射线电子能谱（XPS）等手段对样品的结构、组成和光吸收特性等进行表征；用300W氙灯模拟太阳光，分别在全波段和可见光下对不同Sn2 ，Sn4 掺杂样品进行产氢性能测试。结果表明：Sn4 掺杂TiO2不能在可见光下产氢，而Sn2 掺杂TiO2能在可见光下产氢。Sn2 掺杂样品在n(Ti):n(Sn)=20时产氢性能最好，在全波段和可见光下产氢速率分别为50.3μmol?h-1?g-1和33.09μmol?h-1?g-1，并且在多次循环试验中，产氢效率没有明显减小，性质稳定。

Abstract:

The Sn2 doped TiO2 photocatalyst with high specific surface area and high crystallinity was prepared by one-step hydrothermal route. The effects of different molar doping amount on hydrogen production performance were studied. The structure and spectral characteristics of the samples were characterized by XRD, UV-vis, SEM, EDX, XPS and Low temperature N2-adsorption and desorption. Xenon arc lamp was used as the light source to test the photocatalytic activity of different sample under full band and visible light. It turned out that the samples of the molar ratio of n(Ti):n(Sn)=20 had shown maximum photocatalytic activity of hydrogen production performance , the hydrogen production efficiency in the full band and visible light ware 50.3μmol?h-1?g-1 and 33.09μmol?h-1?g-1 respectively. And in multiple cycle test, hydrogen production efficiency had not significantly reduced, witch mean the sample has a stable nature.