Abstract
The role of weak magnetic field (WMF) on the degradation of a common textile azo-dye, orange G (OG), by magnetic Fenton system was investigated in detail. The results showed that the presence of WMF can provide better performance of the Fe3O4/H2O2 system for OG degradation. The optimized reaction conditions were contained at 1 mM Fe3O4 as Fe, 20 mT of magnetic field intensity, 20 mM H2O2, and initial pH of 3.0. The removal efficiency of OG by Fe3O4/H2O2 coupling with WMF increased largely from 56.3 to 82.3% compared with Fe3O4/H2O2 process. Both the electron paramagnetic resonance (EPR) analysis and the quenching effect of tert-butyl alcohol (TBA) confirmed that hydroxyl radical (•OH) was the primary reactive oxygen species in WMF-Fe3O4/H2O2 system. The improving effect of WMF was explained by the magnetoconvection theory. The presence of WMF could accelerate the corrosion rate of Fe3O4 and thus promoted the release of Fe(II), which led to the increased production of •OH and enhanced the degradation of OG. Moreover, it was surprising to observe that the WMF induced improvement in OG degradation by heterogeneous Fenton involving the iron sludge, namely FeOOH and Fe2O3, as catalysts. These results indicated that WMF could be utilized as an efficient and cost-effective strategy to improve the removal of organic pollutants by iron oxide-based Fenton process.
Highlights
Advanced oxidation processes (AOPs) have been intensively studied for the removal of refractory organic pollutants in water and wastewater treatment
As either the weak magnetic field (WMF)-H2O2 or the WMF-Fe3O4 systems had negligible influence on orange G (OG) degradation (Fig. S2b), the presence of WMF might promote the degradation of OG in the WMFFe3O4/H2O2 system by enhancing the Fenton reaction
The WMF exhibited a high efficiency in facilitating the degradation of OG by Fe3O4/H2O2 system, which was of practical and fundamental importance to the environmental decontamination by the system
Summary
Advanced oxidation processes (AOPs) have been intensively studied for the removal of refractory organic pollutants in water and wastewater treatment. 2016), microwave (Vieira et al 2020), and electricity (Choe et al 2021)), adding chelating or reducing agents (such as nitrilotriacetic acid (Sun et al 2014), citrate (Xue et al 2009b), and ascorbic acid (Sun et al 2020)), and doping other metal (e.g., Cu (Jin et al 2017), Mn (Zhong et al 2014), and Ce (Xu &Wang 2012b)) into the magnetite structure, to promote the Fe(III)/Fe(II) cycle of iron oxide in heterogeneous Fenton reactions These methods always suffer from operational complex, costly, and ecologically toxic. It is imperative to explore an efficient, low-cost, and environmentally friendly process to improve the removal efficiency of organic compounds by Fe3O4/H2O2
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