新型光催化剂BiOI的制备及其光催化性能

Synthesis of New Type BiO I Photocatalyst and Enhanced Photocatalytic Activities

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 different structures of Bi OI photocatalysts were synthesized using hydrothermal method and solvent-thermal method.Several technologies including X-ray powder diffraction（XRD）,scanning electron microscope（SEM） and transmission electron microscopy（TEM） were employed to investigate the phase structures,morphologies.The photocatalytic properties of Bi OI were evaluated by degrading methylene orange（MO） in simulate solar light,and the absorption capacity of solvent-thermal method-prepared samples were better than the solvent-thermal method-prepared and commercial photocatalyst P25 obviously.The absorption rate of methyl orange（MO） maintains more than 90% in 80 minutes.At the same time,it still has very high activity under UV light.In the process of photocatalytic reaction,exited electrons and the photo generated holes led to the photodegradation of MO aqueous by analyzing of the degradation mechanism.