Preparation Of Nanoporous Fe-Co Alloys By Selective Dissolution And Their Fenton-like Catalytic

With the development in research of heterogeneous Fenton porous catalysts,doping is an effective way to improve the activity of Fe-based catalysts.This paper exploit a novel Fenton-like catalysts,the three dimensional nanoporous Fe-Co alloys prepared by selective dissolution of Cu-rich phase in Fe_42.5-xCo_xCu_57.5?x=0,10,20?alloy precursors.The Fe_42.5-xCo_xCu_57.57.5 alloy ribbons were produced through melt quenching method,and the alloys consists of the bcc Fe?Co?-rich and the fcc Cu-rich phases.X-ray diffraction?XRD?,scanning electron microscopy?SEM?,energy dispersive spectrometer?EDS?and vibrating sample magnetometer?VSM?were used to characterize and analyse the structure,composition,morphology and magnetic properties.Additionally,the influence of different Co content and structure of Fe-Co alloy on Fenton catalytic degradation of azo dye methyl orange.The results show that the addition of Co element and nanoporous structure are beneficial to improve the catalytic efficiency of this series alloys,and the catalytic performance is further improved by the refinement of porous structure.The refinement of porous structure and the increase of surface area enhance the catalytic degradation efficiency of nanoporous alloy,make the catalytic action possible to be carried out at lower temperature or higher pH environment.For nanoporous Fe-Co alloy fabricated by dealloying Fe_22.5Co₂₀Cu_57.57.5 with quenching speed of 50 m/s,the optimal parameters of Fenton catalytic reaction for degrading 50 mg/L methyl orange solution are as follow:pH=3,temperature is 313K,H₂O₂ concentration is 35.2 mM,catalyst concentration is 80 mg/L.To reduce the dosage of H₂O₂,namely the cost of application,the optimal parameters mentioned above were modified to be H₂O₂ concentration of 17.6 mM,which is applied to measure the reusability of the nanoporous Fe-Co alloy in degradation of methyl orange.The results exhibit that this material has good reusability and catalytic degradation efficiency,the degradation rate of methyl orange is 100%within 30minutes for each cycle under continuous cycle reaction of 5 times.In general,through the study on the degradation of methyl orange,it is proved that the three-dimensional nanoporous Fe-Co alloy developed in this work is a high speed and efficient Fenton-like catalyst.This bimetallic system provides the experimental and theoretical basis for the development of advanced oxidation processes into efficient,economical and environmentally friendly water treatment technology as well as the future application and industrialization.