A Comparison of Supercritical Carbon Dioxide and Organic Solvents for the Intercalation of 4-Phenylazoaniline into a Pillared Clay Mineral

Author： Ishii R. Wada H. Ooi K.

Publisher： Academic Press

ISSN： 0021-9797

Source： Journal of Colloid and Interface Science, Vol.254, Iss.2, 2002-10, pp. : 250-256

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Abstract

The intercalation of 4-phenylazoaniline (PAA) in supercritical carbon dioxide (SC-CO₂) into montmorillonite (TMA–Mnt) pillared with tetramethylammonium ions at 313 K and 15 MPa was investigated. The adsorption rate and equilibrium PAA uptake were compared with those in n-hexane, CCl₄ and benzene solutions at 313 K. The XRD and N₂ adsorption/desorption analyses showed that TMA–Mnt after adsorption of PAA in SC-CO₂ had the same pore structure as after adsorption of PAA in normal solvents. SC-CO₂ was found to be a good medium for PAA adsorption owing to its having a relatively high adsorption rate and the highest adsorptivity at the same PAA concentration. The properties of PAA adsorption on TMA–Mnt could be well elucidated by the difference in solubility parameters between liquid and solid phases. © 2002 Elsevier Science (USA).