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The MOF+ Technique: A Significant Synergic Effect Enables High Performance Chromate Removal
Ist Teil von
Angewandte Chemie (International ed.), 2017-12, Vol.56 (51), p.16376-16379
Auflage
International ed. in English
Ort / Verlag
Germany: Wiley Subscription Services, Inc
Erscheinungsjahr
2017
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
A significant synergic effect between a metal–organic framework (MOF) and Fe2SO4, the so‐called MOF+ technique, is exploited for the first time to remove toxic chromate from aqueous solutions. The results show that relative to the pristine MOF samples (no detectable chromate removal), the MOF+ method enables super performance, giving a 796 Cr mg g−1 adsorption capacity. The value is almost eight‐fold higher than the best value of established MOF adsorbents, and the highest value of all reported porous adsorbents for such use. The adsorption mechanism, unlike the anion‐exchange process that dominates chromate removal in all other MOF adsorbents, as unveiled by X‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), is due to the surface formation of Fe0.75Cr0.25(OH)3 nanospheres on the MOF samples.
A pause from pores: Relying on the surface rather than the pores of metal–organic frameworks (MOFs), the MOF+ method enables an ultrahigh chromate removal in aqueous solution of up to 796 Cr mg g−1, exceeding any porous material for this kind use. The hexavalent chromate is reduced by FeSO4 to generate FeIII and CrIII ions, the MOF surface then induces the formation of Fe0.75Cr0.25(OH)3 nanospheres.