Abstract
A simple one-pot method was used to successfully embed manganese ferrite (MnFe2O4) nanoparticles on the nitrogen-doped reduced graphene oxide matrix (NrGO), which was used to activate peroxymonosulfate to treat the landfill leachate nanofiltration concentration (LLNC) with electrochemical enhancement. NrGO-MnFe2O4 and rGO-MnFe2O4 were characterized by various means. This indicates that nitrogen-doped could induce more graphene oxide (GO) spall and reduction to produce more active centers, and was favorable for uniformly loading MnFe2O4 particles. The comparison between electrochemical/peroxymonosulfate/NrGO-MnFe2O4 (EC/PMS/NrGO-MnFe2O4) system and different catalytic systems shows that electrochemical reaction, NrGO and MnFe2O4 can produce synergies, and the chemical oxygen demand (COD) removal rate of LLNC can reach 72.89% under the optimal conditions. The three-dimensional (3D-EEM) fluorescence spectrum shows that the system has a strong treatment effect on the macromolecules with intense fluorescence emission in LLNC, such as humic acid, and degrades into substances with weak or no fluorescence characteristics. Gas chromatography-mass spectrometry (GC-MS) indicates that the complex structure of refractory organic compounds can be simplified, while the simple small molecular organic compounds can be directly mineralized. The mechanism of catalytic degradation of the system was preliminarily discussed by the free radical quenching experiment. Therefore, the EC/PMS/NrGO-MnFe2O4 system has significant application potential in the treatment of refractory wastewater.
Highlights
At present, due to its advantages of low cost and easy operation, sanitary landfill is always the first choice for solid waste treatment in most developing countries [1]
leachate nanofiltration concentration (LLNC) was treated by electrochemical method combined with PMS/nitrogen-doped reduced graphene oxide matrix (NrGO)-MnFe2 O4 method, and the main conclusions were as follows: 1
NrGO-MnFe2 O4 and rGO-MnFe2 O4 particles with magnetic cycling ability were prepared in one step by simple hydrothermal method, and were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectra (RAMAN) and X-ray photoelectron spectroscopy (XPS)
Summary
Due to its advantages of low cost and easy operation, sanitary landfill is always the first choice for solid waste treatment in most developing countries [1]. PMS alone still has high stability, and has no obvious degradation effect on organic matter in wastewater It needs to be activated by heat [10], electrochemistry [11], ultraviolet light [12], carbon material [13], and transition metal ions [14], etc. In order to further accelerate the reaction efficiency, obtain better treatment effect, and reduce the amount of metal-based catalyst, other technologies can be used to assist the activation of PMS wastewater treatment, such as UV light, heat, and electrochemical. In the process of electrochemical activation, PMS can directly obtain electrons at the cathode and convert them into SO4 — or OH, and directly treat organic pollutants with free radicals. The degradation mechanism of the system was discussed by free radical quenching experiment
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