Structuration of organo-minerals: nanohybrid materials resulting from the incorporation of alcohols in the tunnels of palygorskite

摘要

Palygorskite (PFl-1) is previously heated at 150 ℃ to remove selectively the zeolitic and surface bound water molecules, and then exposed to alcohol vapors at room temperature. The incorporation of ethanol and methanol in the nanostructured tunnels of palygorskite is studied by thermal gravimetric analysis connected with mass spectrometry, and ~(29)Si and ~(13)C solid state nuclear magnetic resonance techniques. In contrast, no indication for the incorporation of n-pentanol could be found. Small alcohol molecules can be intercalated in the nanostructured tunnels of palygorskite. They are H-bonded to the structural water, coordinated to terminal Mg(II) cations. This results in the nearly complete recovering of the original structure of the tunnels of palygorskite, before dehydration.