Ce0.5-xZr0.5-xBa2xO2负载TiO2光催化降解气相苯

在密闭不锈钢反应器内研究了Ce0.5-xZr0.5-xBa2xO2负载锐钛型TiO2光催化降解气相苯的性能.确定了该系列光催化剂的最佳Ba含量,并应用X射线衍射、紫外-可见漫反射光谱以及X射线光电子能谱对催化剂进行了表征.结果表明,TiO2在载体表面均匀分散.在210~400 nm范围内,TiO2/Ce0.5-xZr0.5-xBa2xO2比TiO2吸收更多的紫外光.TiO2/Ce0.5-xZr0.5-x-Ba2xO2包含Ti和O两种元素,TiO2/Ce0.5-xZr0.5-xBa2xO2的Ti 2p结合能向低能端偏移.Ce0.5-xZr0.5-xBa2xO2表面负载TiO2能有效提高催化剂的光催化活性.Ce0.5-xZr0.5-xBa2xO2的作用是转移电子和使催化剂在紫外区的吸收增强.

Gas-Phase Photocatalytic Oxidation of Benzene over TiO2 Supported on Ce0.5-xZr0.5-xBa2xO2

Photooxidation of gaseous benzene was investigated using anatase TiO2 as the catalyst in a closed steel reactor.The photocatalytic activity can be greatly improved by supporting TiO2 on Ce0.5-xZr0.5-xBa2xO2.The optimal Ba content in the photocatalyst was investigated.The prepared photocatalysts were characterized by X-ray diffraction,UV-Vis diffuse reflectance spectroscopy,and X-ray photoelectron spectroscopy.The results revealed that the deposited titania is well dispersed as in the Ce0.5-xZr0.5-xBa2xO2 matrix.TiO2/Ce0.5-xZr0.5-x-Ba2xO2 absorbs much more ultraviolet light in the range of 210-400 nm than TiO2.There are Ti and O elements on the surface of TiO2/Ce0.5-xZr0.5-xBa2xO2,and the binding energy of Ti 2p of TiO2/Ce0.5-xZr0.5-xBa2xO2 shifts to a lower value.Based upon the above observations,it is concluded that the role of Ce0.5-xZr0.5-xBa2xO2 is to transfer electrons and enhance the light absorption of the catalyst in the region of 210-400 nm.