Preparation of nanocrystalline YbFeO3 by sol-gel method and its visible-light photocatalytic activities

Using Fe(NO3)(3)center dot 9H(2)O, Yb(NO3)(3)center dot 5H(2)O, citric acid and ethylene glycol as main raw materials, the gel of YbFeO3 was prepared by sol-gel method. The gel was kept at 100 degrees C for 36 h to make xerogel. Then, the xerogel was calcined in muffle furnace at 800 degrees C to make YbFeO3 samples. The structure and morphology of samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy and UV-visible diffuse reflectance spectroscopy (DRS). The results showed that the perovskite structure YbFeO3 was obtained through sol-gel method. The resulting products have a particle size of 80 nmand an optical band gap of 2.0 eV. Consequently, the YbFeO3 nanoparticles showed high photocatalytic activities for decomposition of methyl orange under visible-light irradiation.