光催化剂Sm2FeSbO7的制备及光物理和光催化性能表征

首次采用固相反应法制备了新型光催化剂Sm₂FeSbO₇，有效地降解了水中有机污染物。利用X射线衍射、扫描电镜、X射线光电子能谱、傅里叶变换红外光谱、透射电子显微镜和紫外-可见光谱仪对Sm₂FeSbO₇的结构和光催化性能进行了表征。Sm₂FeSbO₇为烧绿石型结构，立方晶系和空间群Fd3m结晶。Sm₂FeSbO₇的晶格参数a为1.035 434 nm。Sm₂FeSbO₇的带隙经估算为2.46 eV。用Sm₂FeSbO₇作为光催化剂在可见光照射下降解靛蓝胭脂红，并与氮掺杂TiO₂对比。结果表明，与掺氮TiO₂相比，Sm₂FeSbO₇在可见光照射下光催化降解靛蓝胭脂红显示出较高的光催化活性。总有机碳的减少，无机产物的逐渐形成，SO₄^2-和NO₃^-以及CO₂的演变揭示了在光催化过程中靛蓝胭脂红的连续矿化。检测了一些来自光催化降解靛蓝胭脂红的中间体，如邻硝基苯甲酸和邻硝基苯甲醛，并获得了可能的靛蓝胭脂红光催化降解路径。

Preparation, Photophysical and Photocatalytic Property Characterization of Sm2FeSbO7 during Visible Light Irradiation

In order to efficiently degrade organic pollutants in water, a new photocatalyst Sm₂FeSbO₇ was prepared by a solid-state reaction method for the first time. The construction and photocatalytic property of Sm₂FeSbO₇ had been characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, transmission electron microscope and UV-visible spectrometer. Sm₂FeSbO₇ crystallized with a pyrochlore-type structure, a cubic crystal system and a space group Fd3m. The lattice parameter a of Sm₂FeSbO₇ was 1.035 434 nm. The band gap of Sm₂FeSbO₇ was estimated to be 2.46 eV. The photocatalytic degradation of indigo carmine was accomplished under visible light irradiation with Sm₂FeSbO₇ as a catalyst compared with nitrogen-doped TiO₂. The results indicated that Sm₂FeSbO₇ displayed higher photocatalytic activity compared with nitrogen-doped TiO₂ for the photocatalytic degradation of indigo carmine under visible light irradiation. The reduction of the total organic carbon, the gradual formation of inorganic products, SO₄^2- and NO₃^-, and the evolution of CO₂ revealed the continuous mineralization of indigo carmine during the photocatalytic process. Some intermediate products which came from the photocatalytic degradation of indigo carmine were detected, such as o-nitrobenzoic acid and o-nitrobenzaldehyde, and a possible photocatalytic degradation path of indigo carmine was acquired.