Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 120, Issue 3, Pages 325-330Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2008.11.020
Keywords
Metal-organic framework; Water adsorption; Heat of adsorption; Pore volume; Bridging effect
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The water physisorption properties and the water stability of the metal-organic frameworks HKUST-1 (=(Cu-3(BTC)(2)) (BTC benzene-1.3,5-tricarboxylate)), ZIF-8, MIL-101, MIL-100(Fe) and DUT-4 (=Al(OH)(NDC)) (NDC naphthalene-2,6-dicarboxylate) were studied. The water physisorption isotherms were compared to nitrogen physisorption isotherms and the chemical stability after water adsorption was investigated. Water adsorption does not only provide information about specific surface area, pore size and pore volume, but can also be used to estimate hydrophobicity and stability towards moisture. Both HKUST-1 and DUT-4 turned out to be unstable in direct contact with water, whereas the MIL-materials and ZIF-8 do show stability. The highest water adsorption affinity was observed for HKUST-1. Even though unstable in liquid water, for applications in trace water removal or molecular sensing HKUST-1 is a promising material. ZIF-8 is highly inert but hydrophobic. The MIL-materials are both likely candidates for water adsorption applications, but higher concentrations of the adsorbate are needed to attain an effective adsorption. DUT-4 shows insufficient adsorption capacity, but stability at ambient conditions is given. (C) 2009 Elsevier Inc. All rights reserved.
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