Abstract
The intercalation of 4-phenylazoaniline (PAA) in supercritical carbon dioxide (SC-CO 2) 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, CCl 4 and benzene solutions at 313 K. The XRD and N 2 adsorption/desorption analyses showed that TMA–Mnt after adsorption of PAA in SC-CO 2 had the same pore structure as after adsorption of PAA in normal solvents. SC-CO 2 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
