Preparation Of Three Dimensional Fe₃C/C Composite Materials For Activating Peroxymonosulfate

Advanced oxidation technology based on peroxymonosulfate has gradually become a hot research topic in sewage treatment and environmental treatment.In terms of the selection of catalytic materials,more and more researchers are committed to composite carbon materials and metal materials,and have obtained excellent catalytic performance.However,most of the reported one-dimensional composites are easy to agglomerate,and the carbon network structure and the metal active center cannot play a synergistic role,which limits the performance of the activated monosulfate.Therefore,in addition to the inherent activation properties of the material itself,the rational design of the microstructure may also provide a positive role in enhancing catalytic activity.Therefore,this paper designed and synthesized a three-dimensional Fe₃C@NC composite material,further introduced Cu atom modification to obtain FeCu_x/NC material,and studied the performance of the material activated persulfate to degrade bisphenol A and the related catalytic mechanism.The nitrate-assisted method was used to design the Fe₃C@NC-X composite material,and the composition,structure and morphology of the material were characterized by XRD,Raman,TEM,and XPS.The test results show that the Fe₃C@NC-X compound sample is composed of a core-shell structure of graphitized carbon-coated Fe3 C particles embedded in carbon nanosheets,and presents a three-dimensional network structure.Fe₃C@NC-700 has a high degree of graphitization and rich nitrogen doping content,which makes it have good catalytic efficiency in PMS activation and can effectively remove bisphenol A.The catalytic activity of Fe₃C@NC-700 is better than that of common metal oxides,and the carbon network and Fe3 C particles can cooperate well.Continue to explore the effect of catalyst/oxidant content,inorganic anions,humic acid and actual water on Fe₃C@NC-700/PMS system.Free radical quenching experiments show that the active substances in the degradation process include both ·OH,SO₄^·-and other free radicals,as well as ¹O₂.The EPR test further proved that the Fe₃C@NC-700/PMS system degraded BPA through free radical and non-free radical pathways.It provides ideas for the preparation of high-performance composite materials with special structures,and explores the key role of nitrogen doping.Further using the nitrate-assisted method,FeCu_x/C composite materials with different nitrate ratios were successfully prepared,of which FeCu_0.3/NC-700 can maintain a good three-dimensional morphology,and explored the bimetallic doping on FeCu_x/NC composite materials The degradation performance.The degradation performance of bimetallic FeCu_x/NC is better than that of Fe₃C@NC and Cu/C.The synergistic effect of bimetallic is beneficial to the effective activation of PMS to degrade Bisphenol A,that is,the catalytic performance of the material can be improved by synthesizing the bimetallic composite structure.The experiment of the influence of inorganic ions,humic acid and actual water body verified the anti-interference ability of FeCu_x/NC/PMS.For the mechanism study,EPR test shows that the degradation is a non-free radical process dominated by ¹O₂.The bimetal in FeCu_x/NC facilitates the increase of graphitized nitrogen content,and explores its important role in the induction of non-radical mechanisms.