关键词: 溶胶-凝胶法, Ti掺杂BiFeO₃, 纳米粒子, 煅烧温度

Abstract: 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.

Key words: sol-gel method； Ti-doped BiFeO₃； nanoparticle, calcination temperature