Chen Shuhai, Lv Baoliang, Wu Dong, Xu Yao
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
J Nanosci Nanotechnol. 2013 Feb;13(2):1569-73. doi: 10.1166/jnn.2013.6029.
Ag-Si codoped TiO2 nanoparticles were successfully synthesized via a rapid and energy frugal microwave-assisted solvothermal method. The obtained materials were characterized by XRD, BET, TEM, XPS, and UV-Vis DRS. These characterizations revealed that the obtained materials possessed good crystallinity, small particle size and large surface area. In this system, silicon could enter into the crystal lattice of TiO2, leading to smaller particle size and larger surface area compared to pure TiO2; silver dispersed on the surface of TiO2 particles, contributing to the visible light response and benefiting the efficient separation of photoelectrons and holes. Thus, the synthesized materials should achieve enhanced photoactivity under visible light irradiation, and that was evaluated by the decomposition of Rhodamine B in the aqueous solution. It was found that the Ag-Si codoped TiO2 photocatalyst exhibited higher photocatalytic activity compared with pure TiO2 and Ag or Si doped TiO2. The doping amount of the silver showed significant effect on the photocatalytic activity, and the optimal activity was achieved with Ag content of 1 mol%.
通过快速且节能的微波辅助溶剂热法成功合成了Ag-Si共掺杂的TiO₂纳米颗粒。采用X射线衍射（XRD）、比表面积分析（BET）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和紫外-可见漫反射光谱（UV-Vis DRS）对所得材料进行了表征。这些表征表明，所得材料具有良好的结晶度、小粒径和大表面积。在该体系中，硅可进入TiO₂的晶格，与纯TiO₂相比，导致粒径更小、表面积更大；银分散在TiO₂颗粒表面，有助于可见光响应，并有利于光生电子和空穴的有效分离。因此，合成的材料在可见光照射下应具有增强的光活性，并通过罗丹明B在水溶液中的分解来进行评估。结果发现，与纯TiO₂以及Ag或Si掺杂的TiO₂相比，Ag-Si共掺杂的TiO₂光催化剂表现出更高的光催化活性。银的掺杂量对光催化活性有显著影响，当Ag含量为1 mol%时达到最佳活性。
