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Fe@Fe2O3 Core-Shell Nanowires as Iron Reagent. 1. Efficient Degradation of Rhodamine B by a Novel Sono-Fenton Process
文摘
In this study, Fe@Fe2O3 core-shell nanowires were first used as a novel Fenton iron reagent. The nanowireswere synthesized through the reduction of ferric chloride aqueous solution by sodium borohydride at ambientatmosphere, without protection of inert gases or vacuum. Rhodamine B (RhB) could be efficiently degradedin aqueous media by a novel sonochemical-assisted Fenton (sono-Fenton) system based on these Fe@Fe2O3core-shell nanowires. The RhB degradation processes were monitored by UV-vis spectroscopy and totalorganic carbon (TOC) analysis. Fe@Fe2O3 core-shell nanowires showed much higher activity in the sono-Fenton system than other iron reagents such as commercial zerovalent iron powders (Fe0), ferrous ions (Fe2+),and ferric ions (Fe3+). It was found that near 100% decoloration and over 60% TOC removal of RhB (5mg·L-1) could be achieved in 60 min by this novel sono-Fenton system with 0.018 mol·L-1 Fe@Fe2O3 core-shell nanowires. This new iron reagents before and after the sono-Fenton reaction were examined by X-raydiffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thecharacterizations found that the nanowires were transferred to nanotubes/nanoparticles covered with Fe3O4/Fe2O3 after the sono-Fenton process. A possible mechanism of sono-Fenton degradation of RhB with Fe@Fe2O3nanowires was proposed on the basis of the experimental results. It involved homogeneous Fenton andheterogeneous Fenton oxidative degradation simultaneously. The high activity of core-shell Fe@Fe2O3nanowires and the success of their mass production make them attractive for the treatment of organic pollutantsin water.
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