Study On Dye Degradation Properties And Mechanism Of Mg/Al-based Amorphous Alloy

In recent years,with the development of industrial production,more and more dye wastewater is produced,causing serious pollution to the water environmen.Based on the fact that amorphous alloy is a metastable metal alloy with good surface activity and catalytic degradation performance,amorphous alloy has been regarded as an effective catalyst to effectively solve the environmental pollution problem caused by dye wastewater,so it has been widely concerned by all sectors of society,and many researchers also actively devoted to research.On the basis of predecessors,we have further improved the degradation performance of Mg/Al-based amorphous alloy to dye wastewater,and explained the degradation mechanism in the process of catalytic degradation.Firstly,it is found that Mg-based alloys exhibit a good degradation performance in wastewater treatment containing dyes.We found that the as-spun Mg crystalline ribbon,Mg78Zn22(MZ)semi-amorphous ribbon and Mg73Zn22Ca5(MZC)amorphous ribbon could significantly improve their degradation performance in acid orange ?(AO ?)dye solution after pretreatment in citric acid(CA)solution.The degradation rate constant k of MZ ribbon after immersing for 1 h reaches 0.084 min-1,showing a much higher degradation efficiency than other immersed ribbons.Compared with the immersed Mg and MZC ribbons,the surface of immersed MZ ribbon has a developed loofah porous structure and an appropriate crystallization.Here,the crystallization induced porous structure is composed of Zn and ZnO,which can generate more nascent hydrogen[H]by transporting Mg atoms to surface and more O2·-radical by supplying photo-catalysis ZnO under visible light and then enhance the degradation of AO ? dye.This work not only proposes a new method to improve the degradation efficiency of AO II dye by Mg-based alloys,but also provides a new insight into the microstructure and properties of Mg-based alloys.Secondly,we found that Al85Co10Y5(Co10)amorphous ribbon has a good degradation performance in the degradation of methyl orange(MO)dye wastewater through the study of Al-based amorphous ribbon.Compared with the Al85Fe10Y5(Fe10)amorphous ribbon for degradation MO solution,the Co 10 ribbon has higher degradation efficiency,TOC removal rate,stronger reusability,corrosion resistance and lower reaction activation energy.The Co 10 ribbon is not only applicable for acidic MO solution,but also has high degradation efficiency in alkaline MO solution.Compared with the spherical particles on the surface of Fe10 ribbon,the maze like structure on the surface of Co 10 ribbon can increase the reaction surface area and improve the degradation efficiency of MO solution.And more O2·-radicals by supplying photo catalytic Y2O3 under visible light irradiation and then enhance the degradation of MO solution.This study not only provides a high efficiency method for the catalytic degradation of MO solution,but also provides a new research direction for the degradation mechanism of Al-based alloys.We found that when some different surface structures are formed on the surface of Mg-based alloy ribbons or Al-based alloy ribbons,the specific surface area of reaction can be increased to varying degrees.In addition,some oxides can be formed in the reaction or pretreatment process,and these oxides can react under visible light radiation to generate free groups with catalytic degradation characteristics,thus further improving the degradation rate.These findings provide an important theoretical basis for further study on the catalytic degradation of dye wastewater by Mg/Al-based amorphous alloy.