Study On Composition Optimization And Application In Wasterwater Treatment Of Mg-Zn-Ca Amorphous Alloys

Because of the short-range ordered and long-range disordered atomic structure, amorphous alloys have some excellent properties different from t he traditional crystalline materials, such as mechanical properties, magnetic properties, corrosion resistance properties and certain unique catalytic properties. Water is valuable resource for human survival, the degree of harmless wastewater treatment has been a problem to be widespread concern. Research on new materials and new technology of wastewater treatment is the key to solve these problems effectively. Since zero- valent Mg and Ca have high activity in the degradation of organic water compounds, according to the amorphous alloy anti-corrosion and catalytic properties, the Mg-based and Ca-based amorphous alloy has wide application prospect of organic dye wastewater treatment.Mg71+x Zn24-xCa5（x=0, 2, 4 and 6） amorphous ribbons and Ca60+x Mg15Zn25-x（x=0, 5 and 10） amorphous rod are prepared for using X ray diffraction（XRD） and differential scanning calorimetry（DSC） to analyzing the composition and thermal stability of amorphous alloy. Scanning electron microscopy（SEM） is used to characterize the morpholo gy of the amorphous surface. The main conclusions are followed:Amorphous ribbons with thickness of 20-25 μm can be obtained when x is less than or equal to 4 for Mg71+x Zn24-x Ca5（x=0, 2, 4 and 6） alloys. Amorphous rod having a diameter of 2 mm can be formed when x is less than or equal to 4 for Ca60+x Mg15Zn25-x（x=0, 5 and 10） alloys. Two kinds of amorphous materials have good effects on azo dyes. The degrading rate and decolorization percentages increase with the Mg content or Ca content increasing for the amorphous alloys, wherein the degradation time when the direct blue and acid red solutions become clear is 2 minutes and 10 minutes, the decolorization rate reaches 95.41% and 87.18% respectively. The azo dyes wastewater removal rate of COD is about 75%,after reaction of 12 min. The Mg₇₅Zn₂₀Ca₅ amorphous ribbons can be recycled at least 4 times while maintaining the the direct blue wastewater degradation capacity of not less than 80%. Furthermore, the amorphous structure is basically unchanged after the reaction for 60 minutes in wastewater for the ribbon, and the reacted products on the surface of the ribbons is the mineralization substance, which cannot result in secondary pollution to the environment. Mg based amorphous ribbons direct blue and acid red wastewater after 60 minutes of reaction,the non crystal structure is essentially invariant, but with the extension of reaction time, elementsof Ca in amorphous alloy prior to becoming mineralized material, thereby increasing the Mg content in the matrix, thereby maintaining the. ability to degrade in the recycling process decreases slowly.Mg-based amorphous ribbons were studied as the application of environmental materials in this paper, expanding the scope of application of amorphous materials, its research and application value was favorable.