Reversible Structural Change of Cu-MOF on Exposure to Water and Its CO2 Adsorptivity
Langmuir2009Vol. 25(8), pp. 4510–4513
Citations Over TimeTop 10% of 2009 papers
Yan Cheng, Atsushi Kondo, Hiroshi Noguchi, Hiroshi Kajiro, Koki Urita, Tomonori Ohba, Katsumi Kaneko, Hirofumi Kanoh
Abstract
It is important to study the interaction between water molecules and a host structure for understanding the adsorption mechanism of metal-organic framework (MOF) materials. The evolution of the structure of a flexible Cu-MOF, {[Cu(bpy)(H2O)2(BF4)2](bpy)} (bpy=4,4'-bipyridine), upon dehydration and rehydration was studied by thermogravimetric analysis (TGA), infrared (IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and water adsorption. A nearly reversible structural change was observed upon rehydration. More importantly, a unique CO2 "gate adsorption" phenomenon was observed despite the exposure of the Cu-MOF to water. This shows that the Cu-MOF has relatively good stability after exposure to water.
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