光催化
材料科学
扫描电子显微镜
漫反射红外傅里叶变换
X射线光电子能谱
纳米晶材料
透射电子显微镜
傅里叶变换红外光谱
化学工程
微波食品加热
溶剂热合成
漫反射
核化学
催化作用
光化学
纳米技术
有机化学
化学
光学
复合材料
量子力学
工程类
物理
作者
Ying Wang,Hong Wang,Ying Yang,Baifu Xin
标识
DOI:10.1016/j.ceramint.2021.02.041
摘要
In this study, NiFe2O4 (NFO) nanocrystalline powder was synthesized using a glycerol-assisted microwave solvothermal process followed by annealing. In comparison with the traditional preparation method, this method does not require addition of any precipitate-controlling agents. The structural properties of NFO were characterized via different techniques, such as X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, and ultraviolet–visible diffuse reflection spectra. The results suggested that the NFO crystal was a three-dimensional (3D) porous nanosphere with a diameter of approximately 400 nm, and the glycerol added during the preparation process played a crucial role in the formation of 3D nanospheres. The photocatalytic activity of NFO was evaluated by the degradation of methylene blue (MB) in a microwave electrodeless discharge lamp (MEDL) system. Additionally, the mechanism of MB photocatalytic degradation was studied. The results suggest that 88.6% of the MB degraded within 10 min under MEDL irradiation, and the mineralization rate reached 55%. The main active species of MB degradation were e-, h+, and •O2−. In addition, the cycle catalysis experiment confirmed the reusability of NFO 3D nanospheres. We believe that the NFO 3D nanospheres can serve as efficient photocatalysts suitable for MEDL systems.
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