Abstract
A vapour deposition (VD) method was established for preparation of the UiO-66-supported Fe (Fe/UiO-66) catalyst, which provided the first case of the metal-organic framework (MOF)-supported Fe catalyst prepared by using the vapour-based method. The Fe loading was around 7.0–8.5 wt% under the present preparation conditions. The crystal structure of UiO-66 was not obviously influenced by the Fe loading, while the surface area significantly decreased, implicating most of the Fe components resided in the pores on UiO-66. The results for the methyl orange (MO) removal tests showed that MO in aqueous solution can be removed by UiO-66 by adsorption, and in contrast, it can be oxidized by H2O2 with the catalysis of Fe/UiO-66. Further catalytic tests showed that Fe/UiO-66 was rather effective to catalyse the oxidation of benzene derivatives like aniline in water in terms of chemical oxygen demand (COD) removal efficiency. The catalytic test results for Fe/UiO-66 were compared to those of Fe/Al2O3 with the same Fe loading and to the catalysts reported in the literature. This paper provides a general strategy for VD preparation of MOF-supported Fe catalyst on the one hand, and new catalysts for removing organic pollutants from water, on the other hand.
Highlights
Water contamination by organic pollutants, especially toxic ones, is one of the most serious environmental problems today.& 2019 The Authors
This paper presents a novel preparation method for metal-organic framework (MOF)-supported Fe catalyst, characterization results for Fe/UiO-66, and catalytic applications of Fe/UiO-66 for oxidative removal of organic compounds from water
(1) A carrier-gas free vapour deposition (VD) method was established for preparation of MOF-supported Fe catalyst, and the Fe/UiO-66 catalyst was successfully prepared by using the VD method
Summary
Water contamination by organic pollutants, especially toxic ones, is one of the most serious environmental problems today.& 2019 The Authors. The organic pollutants in water can be removed by various techniques such as physical, chemical and biological methods Among these techniques, the Fenton reactions in particular and the advanced oxidation processes (AOP) in general are considered as promising and advantageous techniques owing to their strong oxidative capacity, wide applicability and mild reaction conditions [3,4]. The Fenton reactions in particular and the advanced oxidation processes (AOP) in general are considered as promising and advantageous techniques owing to their strong oxidative capacity, wide applicability and mild reaction conditions [3,4] They are often used when the disposed organic pollutants are poorly bio-degradable. Great research efforts have been taken to develop heterogeneous solid catalysts to overcome the above-mentioned drawbacks of homogeneous Fe3þ catalytic systems
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