Article history: Fe-based metal–organic frameworks (MOFs) including MIL-101(Fe), MIL-100(Fe), MIL-53(Fe), and MIL- Received 2 December 2015 88B(Fe) prepared via a facile solvothermal process were introduced as both adsorbents and catalysts to Received in revised form 19 January 2016 generate powerful radicals from persulfate for acid orange 7 (AO7) removal in aqueous solution. Various Accepted 5 February 2016 catalysts were described and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Available online 6 February 2016 scanning electron microscopy and X-ray photoelectron spectra. Because of the high speciﬁc surface area of the materials, we studied the adsorption isotherms of the four MILs by the ﬁtting of Langmuir adsorption Keywords: isotherm. Meanwhile, the catalytic activities in persulfate oxidation system were investigated. The results Metal–organic frameworks showed that the sequence of the materials ability in the combination of adsorption and degradation was Catalyst MIL-101(Fe) > MIL-100(Fe) > MIL-53(Fe) > MIL-88B(Fe), which had a close connection with the activity of Adsorption metal ion in active site of the catalysts and their different cages in size. Moreover, the reactive species in Sulfate radicals Degradation MILs/persulfate system were identiﬁed as sulfate radicals and hydroxyl radicals. The reaction mechanism for persulfate activation over MILs was also studied.
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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