Zhang Xinnian, Huang Jianhui, Ding Kaining, Hou Yidong, Wang Xinchen, Fu Xianzhi
Research Institute of Photocatalysis, State Key Laboratory Breeding Base of Photocatalysis, Fuzhou University, Fuzhou 350002, PR China.
Environ Sci Technol. 2009 Aug 1;43(15):5947-51. doi: 10.1021/es900403a.
Porous nanocrystalline ZnGa2O4 catalysts were synthesized by a simple soft-chemical method at low temperature. The catalysts were characterized by XRD, nitrogen adsorption, SEM, TEM, UV/ vis, and FT-IR spectroscopy. The activity of the photocatalysts was evaluated by decomposition of benzene and its derivatives in the gas phase. It was found that hydrothermal treatment resulted in the formation of spinel ZnGa2O4 with a large surface area of 43-201 m2 x g(-1) depending on the synthetic temperature. The optimum synthetic temperature was found to be 80 degrees C, at which the sample possessed a surface area of 201 m2 x g(-1) and had the highest photocatalytic activity for degrading benzene. A comparison with TiO2 and Pt/TiO2 showed that the ZnGa2O4 (synthesized at 80 degrees C) had improved photocatalytic activity and durability over the TiO2-based catalysts. No remarkable deactivation of the ZnGa2O4 catalyst was observed in 80 h photoreaction, whereas the TiO2 deactivated remarkably in 24 h reaction. The high photocatalytic performance of porous ZnGa2O4 catalysts can be explained by the large specific surface area, the accessible porous framework, and the high redox power.
采用简单的低温软化学方法合成了多孔纳米晶ZnGa2O4催化剂。通过XRD、氮气吸附、SEM、TEM、UV/vis和FT-IR光谱对催化剂进行了表征。通过气相中苯及其衍生物的分解来评估光催化剂的活性。结果发现，水热处理导致形成了具有43-201 m2·g-1大表面积的尖晶石ZnGa2O4，其表面积取决于合成温度。发现最佳合成温度为80℃，在此温度下样品的表面积为201 m2·g-1，对降解苯具有最高的光催化活性。与TiO2和Pt/TiO2的比较表明，（在80℃合成的）ZnGa2O4比TiO2基催化剂具有更高的光催化活性和耐久性。在80小时的光反应中未观察到ZnGa2O4催化剂有明显失活，而TiO2在24小时的反应中明显失活。多孔ZnGa2O4催化剂的高光催化性能可以通过大比表面积、可及的多孔骨架和高氧化还原能力来解释。
