磁性光催化剂La0.7Sr0.3Mn0.9Ti0.1O3-δ的制备其光催化性能研究

摘要

合成了一种具有磁性的Ti掺杂的La0.7Sr0.3MnO3光催化剂,即La0.7Sr0.3Mn0.9Ti0.1O3-δ.并且利用了X射线衍射(XRD),紫外-可见固体漫反射(UV-vis DRS)、扫描电子显微镜(SEM)和磁性分析(VSM)等分析方法对其进行了表征.实验结果表明:La0.7Sr0.3Mn0.9Ti0.1O3-δ显示软铁磁性能,具有较高的磁化强度和较低的矫顽力和剩余磁化强度,其可利用外加磁场将其容易回收.在太阳光下,La0.7Sr0.3Mn0.9Ti0.1O3-δ在模拟罗丹明B(Rh B)废水中具有明显增强的光催化作用,催化效果好,且其重复使用5次后仍然表现出高的光催化活性.因此,制备的La0.7Sr0.3Mn0.9Ti0.1O3-δ是一种高效率的太阳光驱动光催化剂.%A kind of Ti-doped La0.7Sr0.3Mn0.9Ti0.1O3-δis synthesized in this study and characterized by X-ray diffraction (XRD),UV-vis diffuse reflectance spectra(UV-vis DRS),scanning electron microscope(SEM)and magnetic analysis. The results show that the La0.7Sr0.3Mn0.9Ti0.1O3-δ displays a soft ferromagnetic behavior and has higher magnetization and lower coercivity and remanence,which can be easily recycled by an external magnetic field. In addition,under the solar irradiation,the La0.7Sr0.3Mn0.9Ti0.1O3-δshows an obvious enhanced photocatalytic effect on the rhodamine B(Rh B)wastewater,which exhibits the best photocatalytic activity. Further,the La0.7Sr0.3Mn0.9Ti0.1O3-δ still exhibits a high photocatalytic activity after reused for 5 times. Therefore,La0.7Sr0.3Mn0.9Ti0.1O3-δis a high-efficiency photocatalyst for solar light driven.