Abstract
In this report, we show that superparamagnetic FePt nanoparticles are highly efficient heterogeneous Fenton-like oxidation catalysts and compare their performance to Fe3O4 nanoparticles using methylene blue dye as the target organic. X-ray diffraction and transmission electron microscopy were used to characterize the structure of the nanoparticles, a superconducting quantum interference device confirmed the magnetic properties, X-ray photoelectron spectroscopy characterized the chemical state of Fe in the nanoparticles, and ultraviolet–visible spectroscopy was used to monitor the heterogeneous Fenton-like reaction. The pseudo-first-order reaction rate constant for 5 ppm FePt nanoparticles was approximately 100 times faster than for 5 ppm Fe3O4 nanoparticles under otherwise identical conditions. Furthermore, a concentration of 2,500 ppm Fe3O4 was required to achieve the same reaction extent as 5 ppm FePt. Thus, FePt nanoparticles are more efficient heterogeneous Fenton-like catalyst for H2O2 decomposition and methylene blue decolorization than Fe3O4. Further, as both types of nanoparticles are superparamagnetic, they can easily be reclaimed and reused.
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Acknowledgments
The authors thank the National Science Council of Taiwan (NSC 99-2113-M-110-005-MY2 & 99-2738-M-110-001), the National Sun Yat-sen University Center for Emerging Contaminants Research, and the Center for Biomedical Sensor Research for financial support of this work.
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Below is the link to the supplementary material. SQUID magnetic hysteresis loops for FePt and Fe3O4 NP solutions (S1) and a photo of adjacent vials of FePt and Fe3O4 NP powders responding to a magnet (S2).
Fig. S1
Magnetic hysteresis curves for FePt and Fe3O4 NPs measured at room temperature.(TIFF 7920 kb)
Fig. S2
Adjacent vials of FePt and Fe3O4 NPs with an adjoining magnet demonstrating that the NPs are magnetic.(TIFF 4791 kb)
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Hsieh, S., Lin, PY. FePt nanoparticles as heterogeneous Fenton-like catalysts for hydrogen peroxide decomposition and the decolorization of methylene blue. J Nanopart Res 14, 956 (2012). https://doi.org/10.1007/s11051-012-0956-8
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DOI: https://doi.org/10.1007/s11051-012-0956-8