摘要
Dealloyed ribbons with a layer of networked nanoporous structure of different pore sizes were fabricated by dealloying the as-spun Mg_(65)Cu_(25-x)Ag_(x)Y_(10)(x=0,5,10,at.%)ribbons in dilute H_(2)SO_(4) solution in order to enhance the degradation efficiency of pesticide wastewater.Compared to the as-spun ribbons,it is found that the dealloyed ribbons with the networked nanoporous structure exhibit higher degradation efficiency due to their large specific surface areas and enough active sites for the degradation process.Both the average pore sizes of the nanoporous structure and the degradation efficiency of the pesticide wastewater increase with the increase of Ag addition in the dealloyed ribbons.The maximum degradation efficiency up to 95.8%is obtained for the Mg_(65)Cu_(15)Ag_(10)Y_(10)dealloyed ribbon under the optimal conditions of pH being 3,the initial cis-cypermethrin concentration being 500 mg/L,and the dosage of dealloyed ribbon being 1.33 g/L.
为了提高农药废水的降解率,利用淬态条带Mg_(65)Cu_(25-x)Ag_(x)Y_(10)(x=0、5、10,摩尔分数,%)稀硫酸脱合金化方法在其表面形成一层纳米孔径网状结构。与淬态条带相比,这种结构的脱合金条带由于具有较大的比表面积和多的活性位点数,表现出对农药废水具有更高的降解效率。其纳米多孔结构的平均孔径和降解率随着合金成分中Ag含量的增加而增大。在pH=3、初始顺式氯菊酯浓度为500mg/L、条带用量为1.33g/L的最佳条件下,Mg_(65)Cu_(15)Ag_(10)Y_(10)脱合金条带对农药废水最高降解率达到95.8%。
基金
the financial supports from State Key Laboratory of Light Alloy Casting Technology for High-end Equipment
the Natural Science Foundation of Liaoning Province,China(No.2020-KF-14-03)
the National Natural Science Foundation of China(No.51775353)。
