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• W3121497144 endingPage "129767" @default.
• W3121497144 startingPage "129767" @default.
• W3121497144 abstract "Microscale zero-valent aluminum (mZVAl) is prone to surface passivation due to formation of the surface Al-(hydr)oxide layer, resulting in short reactive life. To overcome this critical drawback, we developed a mechanochemical ball milling approach to modify and activate commercially available mZVAl assisted by the fragile FeSO4·7H2O crystals. SEM-EDS and XPS analyses indicated that the particle surface of the mechanochemically modified mZVAl (Fe-mZVAlbm) was not only fractured with newly formed fresh reactive surfaces, but also attached with a rough layer of Fe-oxides that were uniformly distributed on mZVAl. While pristine mZVAl failed to degrade any phenol, Fe-mZVAlbm was able to rapidly degrade 88.8% within 90 min (initial phenol = 20 mg/L, pH = 2.50, dosage = 3 g/L) under normal oxic conditions, with a pseudo first-order rate constant of 0.040 min−1 and about 70.0% of phenol mineralized in 8 h. Moreover, Fe-mZVAlbm also showed prolonged reactive life, and no significant reactivity drop was evident after six cycles of consecutive runs for phenol degradation. The much enhanced reactivity and reactive longevity of Fe-mZVAlbm are attributed to the critical roles of the surface Fe-oxides, including 1) protecting the newly exposed reactive Al0 from being oxidized by side reactions, 2) serving as an electron mediator facilitating the electron transfer from the core Al0 reservoir to the exterior surface, and 3) acting as an Fe2+ source and a heterogeneous catalyst to enable the Fenton (-like) reactions. This study provides a novel and practical approach for preparing Fe-oxides modified mZVAl with enhanced and long-lasting reactivity." @default.
• W3121497144 created "2021-02-01" @default.
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• W3121497144 date "2021-07-01" @default.
• W3121497144 modified "2023-10-17" @default.
• W3121497144 title "Iron(II) sulfate crystals assisted mechanochemical modification of microscale zero-valent aluminum (mZVAl) for oxidative degradation of phenol in water" @default.
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• W3121497144 doi "https://doi.org/10.1016/j.chemosphere.2021.129767" @default.
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