超声波辐射快速合成高光催化性能的BiOCl(Br)纳米片

在室温条件下,利用超声波辐射方法快速合成了四方状BiOCl(BiOBr)纳米片光催化剂。应用N2-物理吸附、X射线粉末衍射、扫描电镜、透射电镜、紫外可见光谱等手段对催化剂进行了表征,并以波长为λ=365 nm的紫外光和420 nm<λ<660 nm的可见光为光源,评价了该催化剂光催化降解酸性橙Ⅱ的活性。表征结果表明,超声波辐射可加速BiOCl和BiOBr晶化过程,显著提高BiOCl和BiOBr的结晶度,并使其晶粒发生细化,提高催化剂的比表面积。活性测试表明,声化学合成样品的光催化活性优于普通搅拌制备的样品。其中BiOCl的紫外光催化活性高于商业TiO2(P25)光催化剂。

Rapid Fabrication of BiOCl(Br) Nanosheet with High Photocatalytic Performance via Ultrasound Irradiation

Square-like BiOCl and BiOBr nanosheets with high crystallinity were rapidly fabricated by ultrasound irradiation.The prepared samples were characterized by N2 physical adsorption,X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM),and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS).The photocatalytic activity of the samples was evaluated by photocatalytic degradation of acid orange Ⅱ under both UV light (λ=365 nm) and visible light (420 nm＜λ＜660 nm) irradiation.Ultrasound irradiation could effectively accelerate the crystallization process of the BiOCl and BiOBr,increase the surface areas of the samples,and decrease the size of the grain.Much higher photocatalytic activity could be obtained over sonochemistry synthesized samples than the samples prepared by common stirring method.Under UV light irradiation,the activity of sonochemistry synthesized BiOCl is superior to that of commercial TiO2 (P25,Degussa).