Simultaneous oxidation and immobilization of arsenite from water by nanosized magnetic mesoporous iron manganese bimetal oxides (Nanosized-MMIM): Synergistic effect and interface catalysis
CHEMICAL ENGINEERING JOURNAL(2020)
摘要
Toxic arsenic species cycle in the geochemical process are strongly influenced by iron and manganese elements, thus understanding mutual transformation of multiple Fe/Mn redox states is essential to predict the redox transformation and sequestration of arsenic in natural environment. Herein, a nanosized magnetic mesoporous iron manganese bimetal oxides (Nanosized-MMIM) with highly well-ordered inner-connected structure and large surface area was fabricated, the obtained Nanosized-MMIM possessed higher content of surface-bound Fe(II) than Commercial Fe3O4 and Templated Fe3O4 due to the difference of standard redox potential of multiple Fe(II-III)-Mn(II-III) valence states and the synergistic effect of Fe-Mn bimetal oxides. This structural surface-bound Fe(II) was greatly associated to the center dot OHads radicals that generated from the interface catalysis of materials via the Fenton-like pathway. The potential redox transformation of arsenic in liquid-solid two phase by using HPLC-ICP-MS and XPS investigation indicated that As(III) in water was mainly oxidized into As(V) by bulk solution center dot OHfree radicals (30.39%) and surface-bound center dot OHads radicals (69.16%), then the generated As(V) was subsequently adsorbed on the Nanosized-MMIM surface. This study could further improve the deeply understanding on the As(III) abiotic oxidation and sequestration in Fe-Mn co-existed natural environment such as minerals, soils and sediments.
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关键词
Ordered mesoporous bimetal oxides,Surface-bound Fe(II),Arsenic oxidation,Interface catalysis,Synergistic e ffect,Mechanism
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