State Key Laboratory Breeding Base of Photocatalysis, Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002, People's Republic of China.
Nanotechnology. 2013 Jun 28;24(25):255601. doi: 10.1088/0957-4484/24/25/255601. Epub 2013 May 30.
A CdSnO3·3H2O hollow-nanocuboid photocatalyst was successfully synthesized via a facile template-free microwave hydrothermal method for the first time. The as-prepared samples were characterized by x-ray diffraction, UV-vis diffuse reflectance spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis and x-ray photoelectron spectroscopy. Moreover, samples prepared under different reaction times were analyzed by transmission electron microscopy to investigate the formation process of the CdSnO3·3H2O hollow-nanocuboids. Based on this result, a possible mechanism for the formation process was proposed. The sample prepared at 160 °C for 2 h at pH 11 exhibited the best photocatalytic activity and stability for the degradation of gaseous benzene under UV irradiation (λ = 254 nm) as compared with the other samples. The conversion and mineralization rates of benzene were about 12.5% and 67%, respectively. The mineralization rate was twice as high as that of commercial TiO2 (Degussa Co.). Furthermore, the excellent stability for the benzene decomposition was attributed to the positive charge on the catalyst surface, which was analyzed both by electron spin resonance and Zeta-potentials.
一种 CdSnO3·3H2O 中空纳米立方体形光催化剂首次通过简便的无模板微波水热法成功合成。通过 X 射线衍射、紫外可见漫反射光谱、BET 比表面积分析和 X 射线光电子能谱对所制备的样品进行了表征。此外，通过透射电子显微镜对不同反应时间下制备的样品进行了分析，以研究 CdSnO3·3H2O 中空纳米立方体形的形成过程。基于这一结果，提出了一种可能的形成机制。与其他样品相比，在 pH 值为 11 时于 160°C 下反应 2 h 制备的样品在紫外光（λ = 254nm）照射下对气态苯的降解表现出最佳的光催化活性和稳定性。苯的转化率和矿化率分别约为 12.5%和 67%。矿化率是商业 TiO2（Degussa Co.）的两倍。此外，催化剂表面的正电荷分析，包括电子顺磁共振和 Zeta 电位分析，归因于苯分解的优异稳定性。
