Imaging Science and Photochemistry ›› 2017, Vol. 35 ›› Issue (1): 61-69.DOI: 10.7517/j.issn.1674-0475.2017.01.061

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Synthesis and Properties of a Novel Fe Doped Perovskite-type KMgF3 Photocatalyst

NIE Kun, YANG Hanpei, SUN Huihua, CUI Suzhen, WU Junming   

  1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, Jiangsu, P. R. China
  • Received:2016-10-15 Online:2017-01-15 Published:2017-01-15


The Fe doped perovskite-type Fe-KMgF3 photocatalysts were synthesized by a microemulsion preparation. The as-prepared catalysts were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (UV-Vis DRS), photoluminescence spectra(PL spectra) and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the materials was performed by the degradation of aqueous Rhodanmine B and Methyl Orange. Results demonstrate that Mg2+ in KMgF3 may be substituted by a low amount of Fe3+ to form a homogenous solid solution while the perovskite-type structure of KMgF3 remains unchanged. The doping by Fe can suppress the growth and aggregation of KMgF3 crystallion, helps to improve the light response and inhibit the recombination of phtogenerated hole/electron pairs by forming the donor level of impurities and shallow traps in lattice matrix. The photocatalytic degradation rates of Rhodanmine B and Methyl Orange on doped catalyst under optimal content of Fe3+ (one quarter of Mg2+) reached 92% and 91% respectively in 30 min, and about 63% and 68% respectively of degradation rate enhancement which compared with non-doped KMgF3 was observed. After 5th photocatalytic experiment, the photocatalytic degradation rate of Rhodanmine B remains more than 90% of the fresh.

Key words: KMgF3, Fe doption, perovskite, rhodanmine B, methyl orange, photocatalysis