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采用水热法和溶剂热法制备了两种不同结构的光催化剂BiOI,通过X-射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等技术对其晶相结构、微观形貌进行了表征,并模拟太阳光下降解甲基橙(MO)来评价所制备样品的催化性能。光催化实验表明,可见光下溶剂热法所制备的光催化剂明显优于水热法合成的催化剂以及商品光催化剂P25,在80 min内对甲基橙溶液的催化降解率达90%以上,同时在紫外光下依然具有很高的活性。分析其降解机理可知,光催化降解过程是光生电子与空穴同时作用的结果。
Two kinds of BiOI photocatalysts with different structures were prepared by hydrothermal method and solvothermal method. The crystal structure of BiOI was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) The morphology of the samples was characterized and the degradation of methyl orange (MO) by sunlight was simulated to evaluate the catalytic performance of the prepared samples. Photocatalytic experiments show that the visible light photocatalyst prepared by solvothermal method is significantly better than the hydrothermal synthesis of commercial catalysts and commercial P25 catalyst, methyl orange solution in 80 min catalytic degradation rate of more than 90% at the same time Under UV light still has a high activity. Analysis of its degradation mechanism shows that the photocatalytic degradation process is the result of photo-generated electrons and holes simultaneously.