Fe@Fe₂O₃ Core−Shell Nanowires as the Iron Reagent. 2. An Efficient and Reusable Sono-Fenton System Working at Neutral pH

Abstract

In this study, we developed an efficient and reusable sono-Fenton system with Fe@Fe 2 O 3 core-shell nanowires as the iron reagent. Similar to our previous sono-Fenton system working at pH ) 2, this system could also much more effectively degrade rhodamine B than those with Fe 2+ , Fe 2+ /Fe 2 O 3 , or commercial zerovalent iron particles as the iron reagents at neutral pH. The nature of the Fe@Fe 2 O 3 nanowire Fenton iron reagent was examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). It was found that this novel Fenton iron reagent could be recycled in this sono-Fenton system working at neutral pH. More importantly, the efficiency of this neutral-pH sono-Fenton system with adding 0.001 mol L -1 of Fe 2+ even reached 92% for degrading RhB at neutral pH. This efficiency was close to that of our previous sono-Fenton system working at pH ) 2. We proposed a possible mechanism for the sono-Fenton degradation of RhB over Fe@Fe 2 O 3 core-shell nanowires at neutral pH, which involved an in situ recycling of iron species (Fe 0 f Fe n+ f Fe 2 O 3 ). We believe that this economical and facile sono-Fenton system based on an Fe@Fe 2 O 3 core-shell nanowire iron reagent may be applied to practical wastewater treatment.

Preparation and catalytic activities of LaFeO3 and Fe2O3 for HMX thermal decomposition

“…4a, the peak positions (710.7 and 724.2 eV for Fe 2p 3/2 and Fe 2p 1/2 , respectively) and the shake-up contribution at about 719.1 eV suggest the presence of Fe 3+ on ␣-Fe 2 O 3 surface [17]. In Fig.…”

Novel magnetic porous carbon spheres derived from chelating resin as a heterogeneous Fenton catalyst for the removal of methylene blue from aqueous solution

“…The reactive Å OH generated at the surface of the nano-size c-Fe 2 O 3 exhibits a high oxidizing property [43]. Moreover, highly reactive species generated at the interface between a-Fe and the iron oxides can accelerate electron transfer between each other, which also improves the catalytic properties [44][45][46].…”

Degradation characteristics of humic acid over iron oxides/Fe0 core–shell nanoparticles with UVA/H2O2

“…Besides the traditional treatments of humic acids [5][6][7][8], studies of the degradation of HA have been carried out with advanced oxidation processes (AOPs) [9][10][11][12][13], among which the heterogeneous Fenton system has attracted great attention due to its formation of highly potent chemical species, • OH, for non-selective oxidation [14,15]. Zero valent iron has been widely used in different environmental treatment processes [16,17] and the direct electron transfer from Fe 0 to H 2 O 2 during a Fenton reaction is a very slow process at neutral pH [18].…”