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Issue 14, 2012
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Exploring the coordination chemistry of MOF–graphite oxide composites and their applications as adsorbents

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Abstract

Metal–organic frameworks (MOFs), besides being porous materials exhibit a very rich chemistry, which can be used for the synthesis of composites and/or the reactive adsorption of toxic gases. In this study, composites of MOFs (MOF-5, HKUST-1 or MIL-100(Fe)) and a graphitic compound (graphite or graphite oxide, GO) were synthesized and tested for the removal of NH3, H2S and NO2 under ambient conditions. The materials were characterized before and after exposure to the target gases by X-ray diffraction, thermogravimetric analysis, N2 sorption measurement and FT-IR spectroscopy. The results indicate that strong chemical bonds exist between the MOF and GO as a result of the coordination between the GO oxygen groups and the MOFs’ metallic centers. Depending on the structure of the MOF, such interactions induce the formation of a new pore space in the interface between the carbon layers and the MOF units, which enhances the physical adsorption capacity of the toxic gases. When unsaturated metallic sites are present in the MOFs, the target gases are also adsorbed via coordination to these centers. Further reaction with the framework leads to the formation of complexes. This is accompanied by the collapse of the MOF structure.

Graphical abstract: Exploring the coordination chemistry of MOF–graphite oxide composites and their applications as adsorbents

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Article information


Submitted
24 Oct 2011
Accepted
07 Jan 2012
First published
21 Feb 2012

Dalton Trans., 2012,41, 4027-4035
Article type
Paper

Exploring the coordination chemistry of MOF–graphite oxide composites and their applications as adsorbents

C. Petit and T. J. Bandosz, Dalton Trans., 2012, 41, 4027
DOI: 10.1039/C2DT12017H

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