摘要： 采用溶剂热-沉淀法制备BiOI负载Fe₃O₄的新型可见光催化剂BiOI/Fe₃O₄，并通过X射线衍射（XRD）和扫描电镜（SEM）对BiOI/Fe₃O₄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（SO₄^·-）。

关键词: 光催化剂, BiOI/Fe₃O₄, 光催化激活, 过硫酸盐, 金橙Ⅱ

Abstract: 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 mi-croscopy(SEM). The results show that the degradation rate of orangeⅡ increases with the increase of PS initial concentration and catalyst concentration. However,when the PS concentration and catalyst concentration are in-creased to 0.5 mmol/L and 0.5 g/L,respectively,the degradation rate decreases with the increase of the concentra-tion of both. With the increase of the initial pH,the degradation rate of orangeⅡdecreases gradually. Further-more,the addition of free radical quenching agents isopropanol and tert butyl alcohol has proved that the main ac-tive radicals of the system are ·OH and SO₄^·-.

Key words: photo-catalyst, BiOI/Fe₃O₄, photo-catalytic activation, persulfate, orangeⅡ

中图分类号: 

• X703.1