Activation performance and mechanism of a novel heterogeneous persulfate catalyst: Metal-organic framework MIL-53(Fe) with FeII/FeIII mixed-valence coordinatively unsaturated iron center

Mengjie Pu, Yongwen Ma, Jinquan Wan, Yan Wang, Jiumei Wang, Mark L Brusseau

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

In this work, a novel and effective heterogeneous catalyst, the metal-organic framework MIL-53(Fe), has been synthesized for the purpose of activating persulfate (PS). The catalytic performance of MIL-53(Fe) activated under different vacuum conditions was investigated; the stability and reusability of the catalyst were evaluated, and the activation mechanism was also investigated. The results indicated that vacuum activation could cause variation of the FeII/FeIII relative amount ratio of the catalyst, and thus would change the catalytic activity of MIL-53(Fe), because FeII and FeIII CUS (coordinatively unsaturated metal sites) are alternative active sites. It was found that MIL-53(Fe)-2 exhibits good performance in PS activation and could be used for multiple cycles; an OG removal rate of 98% was obtained within 120 min (95.7% mineralization efficiency) and 94.3% was achieved in the fifth cycle. The mechanism of activation of PS by MIL-53(Fe) was also suggested, which involved a predominant heterogeneous reaction and an auxiliary homogeneous reaction. The findings of this study provide a new insight into the application of reactive metal-organic frameworks in activating persulfate for the degradation of environmental contaminants.

Original languageEnglish (US)
Pages (from-to)1129-1140
Number of pages12
JournalCatalysis Science and Technology
Volume7
Issue number5
DOIs
StatePublished - 2017

ASJC Scopus subject areas

  • Catalysis

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