Study On The Degradation Performance Of Mo-Co/Fe-based Amorphous Alloy Dye Wastewater And Its Mechanism Analysis

Textile and garment industry is an important traditional pillar industry in China,which has made outstanding contributions to promoting urbanization,improving people’s living standards and economic prosperity.At present,it has become the second largest industry in the world,and the annual amount of wastewater generated accounts for about 20%of the total global wastewater.Until now,it became the second highest wastewater discharge in the Chinese industrial sector,while the water reuse rate is only 7%.Dye wastewater is a global problem that needs to be solved because of its high concentration,complex composition and potential carcinogenicity,and its direct discharge will cause serious environmental pollution.As a class of metallic materials,amorphous alloys have high atomic energy,good structural homogeneity,corrosion resistance,and unique selectivity and reactivity to wastewater treatment.In this paper,Co65Mo15B20,Mo51Co34B15,Mo51Co17Fe17B15 and Mo51Fe34B15 amorphous alloy wires with high specific surface area were prepared by melt spinning method,and their degradation behavior and catalytic mechanism on dye wastewater were studied in detail.The main research results are as follows:(1)Co65Mo15B20 amorphous alloy wires were successfully prepared and their degradation behavior to Direct Blue 6 solution was investigated.The results shown that the synergistic effect of the bimetal enabled the complete degradation of the solution within 2 min,and the catalyst exhibited a lower reaction activation energy(Ea=20.5 kJ/mol)than that of most of the reported amorphous alloys.The amorphous alloys maintained excellent degradation performance when the temperature,concentration and pH of the dye solution were changed.In addition,the self-exfoliation effect of corrosion products gives it a long-term reactivity of at least super 20 cycles.(2)High specific surface area Mo51Co34B15 amorphous alloy wires with excellent reactivity at a wide range of pH conditions were prepared.The results exhibited that the amorphous alloy catalyst can completely degrade the Crystal Violet solution at pH 510 with the dominant role of superoxide radicals(·O2-).In addition,Mo51Co34B15 also showed high catalytic activity for Direct Blue 6 and Malachite Green dyes.The Mo51Co34B15 catalyst also had excellent cycling stability(80%degradation efficiency after 46 cycles).Which was mainly due to the ability of Mo4+to regulate electron transfer and accelerate the transformation process from Co3+ to Co2+ on the surface,forming a bimetallic internal cycling mechanism.(3)In order to further improve the catalytic activity of the amorphous alloy under partially acidic conditions,Fe was introduced into the MoCoB system,and Mo51Co17Fe17B15 and Mo51Fe34B15 amorphous alloy wires were successfully designed and prepared.The degradation performance in Crystal Violet solution shown that the time required for the Mo51Fe34B15 was only 1/2 of the Mo51Co17Fe17B15 when the same degradation was achieved.Both amorphous alloy wires were expanded for their degradation performance in acidic media with pH 2-3.5.In summary,four new high specific surface area amorphous alloy wires with excellent degradation properties to dye solutions were successfully prepared by melt spinning method.Among which Co65Mo15B20 and Mo51Co34B15 amorphous alloy wires have both high reactivity and superior reusability.The introduction of Fe element further broadens the adaptability of MoCoB system to a wider range of pH conditions,and fills the gap that most of the currently reported amorphous alloys cannot exert degradation performance in alkaline media while maintaining the degradation performance in acidic media.The results of this paper provide technical reference and theoretical support for solving the current problems of dye wastewater treatment in China,and provide a new idea for promoting the engineering application of amorphous alloys.