Investigative On Micro-Nanoization Surface And Catalytic Performance Of Fe-Si-B Amorphous Alloy

Recently,Fe-based amorphous alloys have gained a great deal of interests due to the unique properties,including high strength,metastability,outstanding soft magnetic properties and anti-corrosion resistance,as well as superior catalytic ability.Very recently,it is found that some iron-based amorphous alloys could be used as zero-valent iron to rapidly discolorate the phenol and exhibit promising application in wastewater treatment.However,for now,there are still many problems to be resolved,such as the kinetic process,internal mechanism,effects of composition and environmental virables.In this study,beginning with the Fe-Si-B amorphous alloys,iron-based amorphous alloys were studied to explore the preparation principle,their kinetic processes and internal mechanisms and so on.In the study,we selected different corrosion solution,and control the reaction time,reaction temperature,concentration of the solution in the dealloying process.In the alkali corrosion process,the porous size was adjusted by changing either the ultrasound power or the ultrasonication time.In summary,the porous structures with tunable porous sizes?30-150 nm?were successfully prepared by the alkali corrosion and the distribution of porous structure is uniform.Under the effect of ultrasound-assisted,the stable porous structures consisting of uniform porous and amorphous alloys ligaments were formed on the surface of dealloyed samples.Through the studies on the Fe-Si-B ternary amorphous alloys,it is found that the Fe₇₆Si_7.2B_9.6P_7.2 amorphous alloy ribbons with porous structure could be more reactive than its amorphous counterparts.The optimum experimental conditions were as follows: the reaction temperature was 50?,the initial pH value of the solution was 4,and the concentration of catalyst was added and hydrogen peroxide concentration of 4g/L and 0.3mol/L,respectively.After 30 min reaction,the complete degradation efficiency of phenol reached more than 95%.Under the same neutral conditions,it is found that the degradation mechanism of Fe-Si-B ternary metallic glasses is the same as the crystalline zero-valent iron.Further analysis shows that the high degradation ability of Fe-Si-B amorphous alloys is ascribed to the metastable amorphous structure and the existence of porous structures,which could enhance the reactivity of degradation reaction.The degradation studies with Fe-Si-B amorphous alloys with porous structure show that Fe-Si-B possess superior degradation ability in treating phenol containing wastewater.