负载型Co/BiVO_4催化剂的制备及其光催化脱氮性能

Preparation of Supported Catalyst Co/BiVO_4 and Its Photocatalysis Denitrification Properties

采用水热法制备BiVO4,再采用浸渍水热法和浸渍焙烧法制备负载型Co/BiVO4。考察了Co负载量、焙烧温度和焙烧时间对Co/BiVO4晶体结构的影响,并采用X射线衍射、紫外-可见吸收光谱、热重-差热分析等方法对BiVO4和Co/BiVO4进行表征。将Co/BiVO4催化剂用于可见光催化模拟油脱除有机碱性氮,考察催化剂制备条件对Co/BiVO4光催化脱氮活性的影响。结果表明,在Co负载量为5%、400℃下焙烧1h的浸渍焙烧法得到的Co/BiVO4催化剂的光催化脱氮活性最高,含吡啶氮模拟油的光催化脱氮率达到83.59%。

BiVO4 was prepared by hydrothermal method,and Co/BiVO4 catalysts were prepared by dipping-hydrothermal method and dipping-calcination method,which were characterized by X-ray photoelectron spectroscopy,ultraviolet-visible absorption spectroscopy and thermogravimetry.The influences of preparation conditions on crystal structure of Co/BiVO4 were investigated,including Co doping amount,calcination temperature and time.Additionally,Co/BiVO4 was applied to catalyze the model oil to deprive the organic alkaline nitride illuminated by visible light and the influences of preparation conditions on photocatalytic activity of Co/BiVO4 were investigated.It was found that the Co/BiVO4 prepared by dipping-calcination method,with the Co loading mass fraction of 5%,calcination temperature of 400℃ and calcination time of 1 h,possessed the best performance in the photocatalytic denitrification of model oil containing pyridine with the denitrification rate of 83.59%.