Effect Of Fe₇₈Si₉B₁₃ Amorphous Alloy On Pesticide Wastewater

China is a big agricultural country,and the production and use of pesticides in the country ranks is the second place in the world.Although the use of pesticides can bring great benefits to the agricultural production,the pesticide wastewater caused by use of pesticides can do great harm to the ecological environment.How to treat effectively the pesticide wastewater is the most important topic of the researchers nowdays.Amorphous alloys have short range ordered and long range disorder structure,which give them better properties than metal alloys,such as better corrosion resistance and good catalytic performances.Therefore they can be a new type of catalyst to degrade the organic matters in pesticide wastewater in the Fenton-like method and the Electric Fenton method.The Fe₇₈Si₉B₁₃3 amorphous ribbon as catalyst for the Fenton-like method was prepared by the single roll quench method.And the Fe₇₈Si₉B₁₃3 amorphous alloy as anode materials for the Electric Fenton method was commercially purchased.Chemical oxygen demand?COD?was considered as the main indicator of the organic contents in wastewater.XRD and SEM were used to analyze the surface morphology and structural change of the Fe₇₈Si₉B₁₃3 amorphous alloy before and after the reaction.Dichlorvos was set as the research object,and the degradation effects of Fe₇₈Si₉B₁₃3 amorphous alloy by the Fenton-like method and the Electric Fenton method on the dichlorvos pesticide wastewater were studied by changing experimental parameters,respectively.Research shows that the degradation effect of the Fenton-like method on the dichlorvos pesticide wastewater using Fe₇₈Si₉B₁₃3 amorphous ribbon as catalyst?Max.COD removal rate80%?is higher than the traditional Fenton method in which iron powder is used as catalyst?Max.COD removal rate 50%?.The best reaction conditions are obtained by changing the experimental parameters,in which the H₂O₂ concentration is 0.82mol/L,the pH value is 2,the Fe₇₈Si₉B₁₃3 amorphous ribbon dosage is 3g/L,the initial dichlorvos concentration is 700mg/L and the maximum COD removal rate is 80%.It is found that the structures of Fe₇₈Si₉B₁₃amorphous ribbon is still amorphous by comparing the XRD patterns of Fe₇₈Si₉B₁₃3 amorphous ribbon before and after the reaction.The Fe₇₈Si₉B₁₃3 amorphous ribbon has good stability as a catalyst and the degradation effect has not been obviously changed after being reused 5 cycles.Research further shows that the degradation effect of the Electric Fenton method on the dichlorvos pesticide wastewater using the Fe₇₈Si₉B₁₃3 amorphous alloy as the anode material?Max.COD removal rate 86%?is higher than the electrochemical method in which pure iron sheet as the anode material?Max.COD removal rate 76%?.The best reaction conditions are obtained by changing the experimental parameters,namely the H₂O₂ concentration is0.41mol/L,the pH value is 4,the power voltage is 15V,the initial dichlorvos concentration is800mg/L,the electrode distance is 100mm and the maximum COD removal rate is 86%.It is also found that the structure of Fe₇₈Si₉B₁₃3 amorphous alloy after the reaction is still amorphous by comparing the XRD patterns of Fe₇₈Si₉B₁₃3 amorphous alloy before and after the reaction.The Fe₇₈Si₉B₁₃3 amorphous alloy has good stability as the anode material and the degradation effect has not been obviously changed after being reused 5 times.