Tuning the Adsorption Properties of UiO-66 via Ligand Functionalization

作者：Gregory E. Cmarik, Min Kim, Seth M. Cohen, Krista S. Walton · 发表于：Langmuir · 年份：2012 · DOI：10.1021/la3035352 · 被引用次数：641 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Carbon Dioxide Capture Technologies、Covalent Organic Framework Applications

UiO-66 is one of the few known water-stable MOFs that are readily amenable to direct ligand substitution. In this work, UiO-66 has been synthesized with amino-, nitro-, methoxy-, and naphthyl-substituted ligands to impart polar, basic, and hydrophobic characteristics. Pure-component CO(2), CH(4), N(2), and water vapor adsorption isotherms were measured in the materials to study the effect of the functional group on the adsorption behavior. Heats of adsorption were calculated for each pure gas on each material. The results indicate that the amino-functionalized material possesses the best adsorption properties for each pure gas due to a combination of polarity and small functional group size. The naphthyl-functionalized material exhibits a good combination of inhibited water vapor adsorption and high selectivity for CO(2) over CH(4) and N(2).