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Using citric acid (C6H8O7·H2O), samarium nitrate (Sm(NO3)3·6H2O) and cobalt nitrate (Co(NO3)3·6H2O) as main raw materials, the SmCoO3 samples were successfully prepared by sol-gel method. The prepared samples were characterized by thermogravimetry and differential scanning calorimetry (TG-DSC), X-ray diffractometer (XRD), scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR). Using azo dye methyl orange solution as the simulated sewage, the photocatalytic activity of SmCoO3 samples was explored at different synthesis temperatures and illumination times. The experimental results show that pure SmCoO3 samples can be prepared at a calcination temperature of 600 °C to 1000 °C. Under ultraviolet light conditions, the sample of SmCoO3 calcined at 800 °C has the best photocatalytic activity. When illumination times is 120 min, the degradation rate of methyl orange of 10 mg/L can reach more than 97%, and SmCoO3 shows good photocatalytic performance. [ABSTRACT FROM AUTHOR]

Using Dy2O3, C4H6CoO4·4H2O, C6H8O7·H2O and HNO3 as the main raw materials, DyCoO3 was successfully prepared by sol-gel method. The DyCoO3 were characterized by TG-DSC, XRD, SEM and FT-IR. Using azo dye methyl orange solution as simulated wastewater, the degradation activity of DyCoO3 under UV irradiation was studied by changing the synthesis temperature and illumination time. The results show that the pure DyCoO3 can be prepared from 750 °C to 1000 °C, DyCoO3 particles were relatively uniform with average grain size of 2–3 μm. The photocatalytic activity of DyCoO3 sample calcined at 800 °C was the best. When DyCoO3 photocatalytic degradation of 10 mg/L methyl orange for 60 min, the degradation rate was close to 100%. This shows that DyCoO3 is a new type of photocatalyst with high efficiency, which lays a foundation for the application of wastewater treatment. [ABSTRACT FROM AUTHOR]