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

doi:10.7517/j.issn.1674-0475.2017.01.061

Abstract

Abstract:

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

NIE Kun, YANG Hanpei, SUN Huihua, CUI Suzhen, WU Junming. Synthesis and Properties of a Novel Fe Doped Perovskite-type KMgF₃ Photocatalyst[J]. Imaging Science and Photochemistry, 2017, 35(1): 61-69.

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

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