Synthesis and Photocatalytic Activity in Visible Light of Mn-doped LaNi1-xMnxO3
ZENG Li1,2,3, PENG Tongjiang1,2,3, SUN Hongjuan1,2,3, LI Yao1,2,3, YANG Jingjie1,2,3
1 School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, China 2 Education Ministry Key Laboratory of Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang 621010, China 3 Institute of Mineral Materials and Application, Southwest University of Science and Technology, Mianyang 621010, China
Abstract: Aseries of Mn-doped LaNi1-xMnxO3 (x=0,0.2,0.4,0.6,0.8,1.0) perovskite oxide photocatalytic materials were prepared by sol-gel me-thod. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and other modern analytical methods were used to characterize the phase and microscopic morphology of LaNi1-xMnxO3 and the photocatalytic performance of the samples was tested with degradation rate of methyl orange. The results showed that Mn-doping caused the diffraction peak to shift toward low angle, which caused lattice expansion and increased the crystal size. Furthermore, after doping, the peak area ratio of Mn4+/Mn3+ and Oads/Olatt increased, which improved the oxidation capacity, the interfacial electron transfer rate and the amount of oxygen adsorbed on the surface of the catalyst and further improved the photocatalytic activity. When the Mn doping amount was 40%, LaNi0.6-Mn0.4O3 had the best photocatalytic performance, and the degradation rate of methyl orange was as high as 99.46% in 120 min under visible light irradiation. In addition, even after five cycles of operation, LaNi0.6Mn0.4O3 still maintains high photocatalytic activity and has excellent recyclability. In the photocatalytic degradation process, the order of free radical activity was: h+, e-, ·OH.
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