光催化剂Sm2FeSbO7的制备及光物理和光催化性能表征
Preparation, Photophysical and Photocatalytic Property Characterization of Sm2FeSbO7 during Visible Light Irradiation
作者单位E-mail
栾景飞 南京大学环境学院污染控制与资源化研究国家重点实验室, 南京 210023 jfluan@nju.edu.cn 
谭文成 南京大学环境学院污染控制与资源化研究国家重点实验室, 南京 210023  
摘要: 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,SO42-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。
关键词: 催化作用  Sm2FeSbO7  光催化降解  可见光照射  光降解路径  靛蓝胭脂红
基金项目: 第5批中国-以色列科学与战略研究开发基金项目(No.[2010]30)和国家自然科学基金(No.21277067)资助。
Abstract: 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, SO42- 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.
Keywords: catalysis  Sm2FeSbO7  photocatalytic degradation  visible light irradiation  photodegradation pathway  indigo carmine
投稿时间:2018-05-17 修订日期:2018-08-14
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栾景飞,谭文成.光催化剂Sm2FeSbO7的制备及光物理和光催化性能表征[J].无机化学学报,2018,34(11):1950-1965.
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