| As a new type of zero-valent iron,iron-based metallic glasses have been found to have the ability to quickly remed iating dye wastewater in recent years.In theory,Fe-based metallic glasses can also be used to treat heavy metal wastewater.However,as far as we know,there is no relevant research report at present.Cu（Ⅱ）and Ni（Ⅱ）are two common heavy metal contaminants.In this study,Fe78Si9 B13 metallic glass ribbons and Fe78Si8B14 metallic glass powders with surface oxidation were used to remove Cu（Ⅱ）and Ni（Ⅱ）,respectively.The purpose of the study was to explore the feasibility of iron-based metallic glass applied to industrial heavy metal wastewater.Based on the Fe78Si9B13 amorphous alloy ribbon removal solution Cu（Ⅱ）,the removal of Cu（Ⅱ）in the Fe78Si9 B13 amorphous alloy ribbon is consiste nt with the removal of crysta lline iron.Cu（Ⅱ）ions are mainly adsorbed by a redox mechanism,resulting in the formation of Cu2O and Cu0,and the removal process couldbe described by a pseudo-first-order kinetic reaction model.In addition,the removal capacity of Fe78Si9B13 amorphous alloyr ibbons was significant better than that of the corresponding crystalline alloy strip and 300 mes hiron powder.Under the same conditions,the surface normalized reaction rate constants for the removal of Cu（Ⅱ）by Fe78Si9 B13 amorphous alloy ribbons could be 2.6 and 39 times larger respectively than those corresponding crystalline alloy ribbons and 300 meshiron powder.Further analys is indicates that high removal effic iency of Fe78Si9B13 amorpho us alloy ribbons results from its amorphous structure and the metalloid additions,which could enhance chemical reactivity and the for mation of easily detached oxide layer on the surface.Meanwhile,the Fe78Si9B13 amorphous alloy ribbons has strong e nviro nmental adaptability.Within the studied conditions,Cu（Ⅱ）ions are found to be removed by Fe78Si9 B13 amorphous alloy ribbons nearly completely within 60 min.Recycled experiments proved that the ribbons did not comp letely lose its removal capacity at high concentrations for uptake trials,so that the remaining ribbons could be reused untile xha usted.Moreover,the remova l efficiency of Fe78Si9B13 amorphous alloy ribbons rema ins 50.7%after being used for 5 times in low concentration wastewater containing Cu（Ⅱ）ions.According to the study on the performance of Fe78Si8B144 amorphous alloy powder in removing Ni（Ⅱ）in solution,it was found that the metal oxides on the surface of powder was easy to peel off,so that it would not become an obstacle to electronic trans miss ion.The fixation of Ni（Ⅱ）is mainly through reduction and adsorption methods,and the removal process followed the pseudo first-order kinetics.Under the same conditions,the removal rate of Ni（Ⅱ）by Fe78Si8B144 a morphous alloy powder is 20 times higher than that of 300 meshiron powder.During the reaction,when the powder surface is completely covered by generated ferrite,the powder will lose the reduction effect on Ni（Ⅱ）,even so,the Ni（Ⅱ）can still removed by adsorption.The excellent removal properties of Fe 78Si8B144 a morphous alloy powder are related to its unique amorphous structure and the addition of metal-like elements,this is because the metastable a morphous structure enables Fe78Si8B144 amorphous alloy powder to have higher chemical activity,and the metal oxides enriched on the powder surface can protect the highly active surface of the matrix from being passivated in the atmosphere.These find ings suggest that the perfor mance of Fe78Si9B13 amorphous alloy powder in removing Ni（Ⅱ）is greatly affected by the change of enviro nmental factors.Both weak acid and alkaline environment can significantly improve the removal capacity of powder,beyond that,the amount of Ni（Ⅱ）ions removal by Fe78Si9B13 amorphous alloy powder can be further enhanced by increasing the reaction temperature and pollutant concentration.However,the Fe78Si9B13 amorphous aloy powder will be consumed in large quantities in highly acidic environments. |
