Papers by Author: He Sun

Abstract: The FeS₂ was synthesized using S powder, FeCl₂4H₂O and PVP as main raw materials by solvothermal method. The FeS₂ product was characterized by XRD, SEM, DRS and TG-DTA. The results show that FeS₂ is the cube structure, particle size about 90 nm, band gap energy Eg=1.9 eV. Consequently, FeS₂ nanoparticles show high visible-light photocatalytic activity for decomposition of methylene blue, which degradation rate of 10mg/L methylene blue solution can reach to 95% for 90 min under visible-light irradiation.

Abstract: The LaNiO₃ nanoparticles were prepared by a sol-gel process. The LaNiO₃ nanoparticles were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance spectroscopy (DRS). XRD and SEM demonstrate the successful synthesis of single phase perovskite LaNiO3 and an average grain size of 80 nm in diameter. It was found that the as-prepared LaNiO₃ shows strong visible-light absorption with absorption onset of 545 nm, indicating a narrow optical band gap of 2.28 eV. Consequently, LaNiO₃ nanoparticles show high visible-light photocatalytic activity for decomposition of methyl orange in comparison with the commercial Degussa P25. The photocatalytic experiment shows the high photocatalytic activity for the decomposition of methyl orange under visible-light irradiation, which is attributed to the strong visible-light absorption.