Effect Of Cu₄₆Zr_47-xAl₇Y_x Amorphous Alloys On The Degradation Of Dye/pesticide Wastewater

Water pollution is an important environmental issue that cannot be ignored in today’s society.Clean water resources are an essential guarantee for economic development and the healthy lives of residents.Solving the problem of water pollution is an important measure to fight the battle for clear water.Recent research has found that amorphous alloys have excellent catalytic properties in wastewater treatment.However,the treatment processes and effects vary depending on the type of alloys.Furthermore,the number of reuses varies greatly due to the different corrosion resistance and degradation mechanisms of the alloys toward the wastewater.In this paper,the degradation effects of Cu₄₆Zr_47-xAl₇Y_x（x=0,1,3,5）amorphous alloys on acid orange II（AO II）azo dyes were compared and analyzed under different process parameters in the reduction and electrochemical methods.Meanwhile,the degradation effects of two simulated wastewaters,cis-cypermethrin pesticide and AO II azo dye,in the electrochemical method were also compared and analyzed.The results of the study obtained have practical significance.The main results include:The decolorization efficiency of AO II azo dyes is improved with the increase of Y content in Cu₄₆Zr_47-xAl₇Y_x（x=0,1,3,5）amorphous alloy ribbons.That is,Cu₄₆Zr₄₂Al₇Y₅has the best catalytic degradation effect,and the dye wastewater can be almost completely decolorized within 60 min.The optimized process parameters with Cu₄₆Zr₄₂Al₇Y₅amorphous ribbon as catalyst are p H=2,the dosage of ribbon being 1.8 g/L,and water bath temperature being 313 K.The decolorization efficiency and chemical oxygen demand（COD）removal efficiency of the dye wastewater are 96.05%and 51.73%,respectively.The amorphous ribbon has excellent decolorization properties even after 10 repeated uses.In the experiments on the degradation of wastewater by the electrochemical method with the amorphous alloy as the anode and the graphite as the cathode,Cu₄₆Zr₄₆Al₇Y₁amorphous alloy shows better degradation effect towards AO II dye wastewater compared with Cu₄₆Zr₄₇Al₇amorphous alloy.When the current density is 0.76 A/cm²,the addition of electrolyte is 0.8 g/L,and the degradation reaction is carried out for 40 min,the decolorization efficiency of dye wastewater can reach 95.59%with the COD removal efficiency of more than 80%.However,the COD removal efficiency of pesticide wastewater by Cu₄₆Zr₄₆Al₇Y₁amorphous alloy can reach 78.5%at the same process parameters.The Cu-Zr-Al-Y amorphous alloy has a strong breaking effect on azo bonds in the reduction method and improves the decolorization of azo dyes,but has a weak effect on the COD removal.In comparison,the Cu-Zr-Al-Y amorphous alloy in the electrochemical method not only has a strong decolorization effect but also has a more significant effect on the COD removal,while the COD removal efficiency of pesticide wastewater by the electrochemical method was reduced.This phenomenon is mainly related to the fact that reduction and electrochemical methods have significantly different degradation reaction mechanisms when degrading the wastewater.In the electrochemical process,it is mainly the oxidation of the anode material,while in the reduction process,it is mainly the reduced hydrogen that acts as a reducing agent that degrades the wastewater.