Fe-based Metal-organic Frameworks for Highly Efficient Degradation
Wastewater in Plasma/Fenton-like System
Abstract
Fe-based metal organic framework (Fe-MOFs) was used as Fenton-like
catalyst in dielectric barrier discharge (DBD) plasma/Fenton-like
technology to treat wastewater, which solved the iron solubility
problem. It was known that the valence state of iron will affect the
catalytic performance, so the Fe-source precursor of FeSO4∙7H2O was
added to regulate the valence state to adjust the catalytic performance
to improve the active site. The influences of discharge voltage,
catalyst addition amount, H2O2 addition amount and pH on the degradation
efficiency of methyl orange (MO) were systematically examined. Through
free radical capture experiments, the reaction mechanism of the
plasma/Fenton-like catalytic degradation process was deduced mainly as
the coordinated oxidation process of hydroxyl radicals, photo-generated
electron holes and superoxide radicals. The reusability experiments
proved that the catalyst was stable and reusable. The possible
degradation pathways were proposed based on the identification of
intermediate products generated in the degradation process by LC-MS
analyses.