BiOI负载Fe_3O_4光催化激活过硫酸盐降解金橙Ⅱ

Photo-catalyst BiOI supported Fe_3O_4 for activating persulfate for orange Ⅱ degradation

采用溶剂热-沉淀法制备BiOI负载Fe_3O_4的新型可见光催化剂BiOI/Fe_3O_4,并通过X射线衍射(XRD)和扫描电镜(SEM)对BiOI/Fe_3O_4进行表征分析。实验结果表明:金橙Ⅱ的降解率随着初始过硫酸盐(PS)浓度和催化剂浓度的增大而增大。但当PS浓度、催化剂质量浓度分别增大到0.5 mmol/L、0.5 g/L时,降解率随着两者浓度的增大而降低。随着初始pH的增大,金橙Ⅱ的降解速率逐渐降低。此外,自由基淬灭剂异丙醇和叔丁醇的加入,证明了该体系主要的活性自由基是羟基自由基(·OH)和硫酸根自由基(SO_4^(·-)).。

The new BiOI supported Fe3O4 visible light photo-catalyst, BiOI/Fe3O4, has been synthesized by a solvo-thermal-deposition method, and characterized ＆ analyzed with X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results show that the degradation rate of orange Ⅱ increases with the increase of PS initial concentration and catalyst concentration. However, when the PS concentration and catalyst concentration are increased to 0.5 mmol/L and 0.5 g/L, respectively, the degradation rate decreases with the increase of the concentration of both. With the increase of the initial pH, the degradation rate of orange Ⅱ decreases gradually. Furthermore, the addition of free radical quenching agents isopropanol and tert butyl alcohol has proved that the main active radicals of the system are ·OH and SO4^.-.