Abstract
The shape of Fe3O4 nanoparticles is controlled using a simple oxidation-precipitation method without any surfactant. The morphology and structure of the obtained Fe3O4 nanoparticles were characterized by using x-ray diffraction, scanning electron microscopy, x-ray photoelectron spectroscopy, N2 physisorption and vibrating sample magnetometer. As-prepared Fe3O4 samples showed octahedron, cube, hexagonal plate and sphere morphologies. Peroxidase-like activity of the four nanostructures was evaluated for catalytic removal of organic pollutants in the presence of H2O2, using rhodamine B as a model compound. The results showed that the H2O2-activating ability of the Fe3O4 nanocrystals was structure dependent and followed the order sphere > cube > octahedron > hexagonal plate, which was closely related to their surface FeII/FeIII ratios or crystal planes. The reusability of Fe3O4 spheres was also investigated after five successive runs, which demonstrated the promising application of the catalyst in the degradation of organic pollutants. This investigation is of great significance for the heterogeneous catalysts with enhanced activity and practical application.
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Acknowledgment
This work was supported by the Natural Science Foundation of Hubei Province under Grant (2014CFB810), Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant (20114219110002) and Science and Technology Project (Major) of Jiangxi Province under Grant (20152ACG70003).
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Wan, D., Li, W., Wang, G. et al. Shape-Controllable Synthesis of Peroxidase-Like Fe3O4 Nanoparticles for Catalytic Removal of Organic Pollutants. J. of Materi Eng and Perform 25, 4333–4340 (2016). https://doi.org/10.1007/s11665-016-2283-1
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DOI: https://doi.org/10.1007/s11665-016-2283-1