Abstract:Dealloyed ribbons with a layer of networked nanoporous structure of different pore sizes were fabricated by dealloying the as-spun Mg₆₅Cu_25-xAg_xY₁₀ (x=0, 5, 10, at.%) ribbons in dilute H₂SO₄ 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 Mg₆₅Cu₁₅Ag₁₀Y₁₀ 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.

Key words: networked nanoporous structure; MgCu-based amorphous ribbon; dealloying; cis-cypermethrin wastewater; degradation efficiency