Li Pinghua, Zhuang Xuye, Xu Jiahuan, Ruan Liuxia, Jiang Yangfan, Lin Jiaxin, Zhang Xianmin
School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China.
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Materials (Basel). 2022 Feb 25;15(5):1743. doi: 10.3390/ma15051743.
The x-SnO/α-FeO (x = 0.04, 0.07, and 0.1) heterogeneous composites were successfully prepared via a two-step solvothermal method. These composites were systematically characterized by the X-ray diffraction technique, field emission scanning electron microscopy, an energy dispersive spectrometer, X-ray photoelectron spectroscopy and a UV-visible spectrometer. It was found that SnO nanoparticles were uniformly decorated on the surface of α-FeO particles in these heterogeneous composites. A comparative study of methylene blue (MB) photodegradation by α-FeO and x-SnO/α-FeO composites was carried out. All x-SnO/α-FeO composites showed higher MB photodegradation efficiency than α-FeO. When x = 0.07, the MB photodegradation efficiency can reach 97% in 60 min. Meanwhile, the first-order kinetic studies demonstrated that the optimal rate constant of 0.07-SnO/α-FeO composite was 0.0537 min, while that of pure α-FeO was only 0.0191 min. The catalytic mechanism of MB photodegradation by SnO/α-FeO was examined. The SnO can act as a sink and help the effective transfer of photo-generated electrons for decomposing hydrogen peroxide (HO) into active radicals. This work can provide a new insight into the catalytic mechanism of the photo-Fenton process.
通过两步溶剂热法成功制备了x-SnO/α-FeO（x = 0.04、0.07和0.1）异质复合材料。采用X射线衍射技术、场发射扫描电子显微镜、能量色散光谱仪、X射线光电子能谱仪和紫外可见光谱仪对这些复合材料进行了系统表征。结果发现，在这些异质复合材料中，SnO纳米颗粒均匀地修饰在α-FeO颗粒表面。对α-FeO和x-SnO/α-FeO复合材料光降解亚甲基蓝（MB）进行了对比研究。所有x-SnO/α-FeO复合材料的MB光降解效率均高于α-FeO。当x = 0.07时，MB在60分钟内的光降解效率可达97%。同时，一级动力学研究表明，0.07-SnO/α-FeO复合材料的最佳速率常数为0.0537 min⁻¹，而纯α-FeO的速率常数仅为0.0191 min⁻¹。研究了SnO/α-FeO光降解MB的催化机理。SnO可以作为电子受体，有助于光生电子的有效转移，从而将过氧化氢（HO）分解为活性自由基。这项工作可以为光芬顿过程的催化机理提供新的见解。
