Degradation Of Azo Dye Wastewater By Amorphous Alloy

The azo dye wastewater is a kind of effluent with poor biodegradability,complex components,high concentration,high toxicity and high difficulty in degradation.For instance,the liquid waste directly discharged into water will give rise to the serious pollution to the water resources and the environment.To solve the problems,amorphous alloys have been extensively investigated due to their excellent catalysis,good corrosion resistance and high degradation rate.Compared with the traditional treatment techniques,the amorphous alloy exhibits several merits,such as simple operation,low cost and no secondary pollution.In this paper,the treatment process of dye wastewater utilizing the advanced oxidation behavior of Cu-based amorphous alloy was investigated by taking acid orange as the target pollutant.The efficiency and mechanism of sulfate radical produced by Cu₄₆Zr_44.5Al_7.5Y₂amorphous alloy activated Na₂S₂O₈(PS)showed a strong correlation with the target pollutant.The effects of initial p H value of the solution,amount of Cu₄₆Zr_44.5Al_7.5Y₂amorphous alloy,initial concentration of PS and temperature on Cu₄₆Zr_44.5Al_7.5Y₂alloy activated by sodium persulfate were concerned for the degradation of acid orange.The experimental results show the acid orange can be significantly degraded by means of Cu₄₆Zr_44.5Al_7.5Y₂amorphous alloy/PS system.As the PS initial concentration increased,the degradation rate of acid orange increased gradually,but the growth trend slowed down.The degradation rate of acid orange decreased gradually with the increase of initial p H.As the temperature increased,the degradation rate of acid orange also increased,but the growth trend slowed down.Cu₄₆Zr_44.5Al_7.5Y₂amorphous alloy presented excellent catalytic performance and good stability.After the experiments were repeated for ten times,the degradation efficiency and degradation rate of the azo dyes still had a favorable effect.Then,the azo dyes were decomposed by Fe₇₈Si₉B₁₃alloy combined with the electrochemical method.The additional current had an expansionary effect on the degradation of the dyes.This was the result of the hydroxyl radicals(-OH)generated by electrocatalytic H₂O₂reaction,which made the decomposed pollutants oxidize rapidly and improved the degradation rate.In groups,an orthogonal experiment was used to determine the experimental parameters with better degradation performance.The optimal experimental conditions were obtained through the analysis and optimization of the parameters.Under the optimal experimental parameters,the cyclic stability experiment was carried out to investigate the structural stability of Fe-based amorphous alloy.The results show that the degradation rate and COD degradation rate of acid orange are 88.76%and85.83%respectively after the 90-minute reaction under the condition of 0.3 g/L,0.09 m A/cm²current density,3p H,1.5 g/L amorphous alloy,30?temperature and0.09g/L H₂O₂concentration.After three times of circulation experiment,the XRD and SEM characterization reveal that Fe₇₈Si₉B₁₃amorphous alloy can obviously improve the degradation rate of wastewater.Moreover,Fe₇₈Si₉B₁₃has a stable amorphous structure and corrosion resistance.The stable structure not only increases the cycle life but also saves cost.