钛掺杂BiFeO3光催化剂的制备及其催化性能

用溶胶-凝胶法制备钛(Ti)掺杂BiFeO₃纳米颗粒(Ti-BiFeO₃)， 研究不同煅烧温度对Ti掺杂BiFeO₃结构调控及光催化性能的影响, 用X射线衍射（XRD）、 扫描电子显微镜（SEM）、 能谱分析（EDS）、 紫外-可见（UV-Vis)光谱技术对颗粒的相结构、 形貌、 原子比例、 光催化性能等进行测试及分析, 并以罗丹明-B为目标降解物， 对Ti掺杂BiFeO3光催化性能进行研究. 结果表明: Ti掺杂BiFeO₃样品在不同煅烧温度均出现Bi₂Fe₄O₉相； 煅烧温度可对Bi₂Fe₄O₉的含量进行调控， 在650 ℃煅烧样品中含有适量的Bi₂Fe₄O₉相， 能有效提高Ti掺杂BiFeO₃的光催化活性， 且具有较高的降解活性， 60 min内降解效率达85%.

Preparation and Catalytic Performance of Ti-Doped BiFeO3 Photocatalyst

Titanium-doped BiFeO₃  nanoparticles was prepared by using the sol-gel method. The effects of different calcination temperatures on the structure of Ti-BiFeO₃ and the photocatalytic performance were studied.  X-ray diffraction (XRD)，  scanning electron microscopy (SEM)，  energy dispersive spectromentry (EDS)，  ultraviolet visible (UV-Vis)  spectroscopy were used to test and analyze the  phase structure, morphology, atomic ratio and photocatalytic performance of the particles. Taking Rhodamine-B as the target degradation product，  the  photocatalytic performance of Ti-doped BiFeO₃ was studied.  The results show that there are Bi₂Fe₄O₉ phases at different calcination temperatures in Ti-doped BiFeO₃ samples. The calcination temperature can control the content of Bi₂Fe₄O₉.  There are appropriate amount of Bi₂Fe₄O₉ phase in the calcined sample at 650 ℃， which can effectively improve the photocatalytic activity of Ti-doped BiFeO₃ and degradation activity. The degradation efficiency is 85% within 60 min.