期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 58, 期 33, 页码 15151-15161出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b02777
关键词
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资金
- National Natural Science Foundation of China [21676115, 51609100, 61675090, 61575080]
- Thirteenth Five-Year Program for Science and Technology of Education Department of Jilin Province [JJKH20191018KJ, JJKH20191022KJ]
In this study, the three-dimensional (3D) flowerlike porous Fe3O4 microcrystals were prepared by a self-assembly approach with the assistance of ethylene glycol (EG). The generation mechanism of the 3D flowerlike Fe3O4 microcrystals was revealed through controlling the parameters of the hydrothermal reaction time, the molar mass of the urea, and the calcination temperature. The proposed 3D flowerlike Fe3O4 microcrystals exhibited superparamagnetic behaviors with high saturation magnetization (i.e., up to 73.1 emu.g(-1)) at room temperature. The Fe3O4-Au magnetic composites (MCs) were further prepared by a seed deposition process, and surface features were revealed by TEM, XRD, XPS, UV-vis, and SQUID techniques. Compared with the Fe3O4 microcrystals themselves, the Au (similar to 20 nm) covered Fe3O4 microcrystals provided efficient and recyclable catalytic performance (e.g., unprecedented high turnover frequency of 2.874 min(-1)) for 4-nitrophenol (4-NP). More importantly, the proposed Fe3O4-Au MCs could be used to reduce 4-NP for more than six cycles, elaborating that Fe3O4-Au MCs are promising catalysts in the field of environmental purification.
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