蚕茧状BiOCl的合成及其可见光催化降解RhB性能

Synthesis of cocoon-like BiOCl and photocatalytic degradation of RhB by visible light

以可溶性淀粉为表面活性剂,通过水热法成功合成了蚕茧状BiOCl光催化剂.采用X射线衍射仪(XRD)、扫描电镜(SEM)、紫外-可见漫反射光谱仪(DRS)和透射电镜(TEM)对所制备催化剂进行表征.以RhB染料为目标污染物,系统考察了加入不同量可溶性淀粉所合成的BiOCl对罗丹明B(RhB)的降解效果.结果表明,加入0.1 g可溶性淀粉所合成的BiOCl展示出最好的光催化性能,60 min即可将RhB降解掉97.3%;自由基抑制实验表明在降解过程中·O_2^-是主要的活性物种;循环实验研究表明,催化剂具有优异的循环稳定性.

The cocoon-like BiOCl nanoplates photocatalysts were synthesized by the hydrothermal synthesis method using soluble starch as the surfactant.The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),highresolution transmission electron microscopy(HR-TEM) and UV-Vis diffuse reflectance spectroscopy(DRS).The effect of the addition of surfactant on the photocatalytic activity of Bi OCI was studied.Experiments show that the BiOCl nanoplates with adding 0.1 g soluble starchle give the high photocatalytic activity.The degradation rate can reach 97.3% within 60 min.The superoxide radical is the major active species in photocatalytic degradation of RhB by BiOCl nanoplates.Moreover,it shows good stability in the repeated reaction.