Prediction of VOCs adsorption equilibria on activated carbon in supercritical carbon dioxide over a wide range of temperature and pressure by using pure component adsorption data: Combined approach of the Dubinin-Astakhov equation and the non-ideal adsorbed solution theory (NIAST)

A new prediction methodology by using the non-ideal adsorbed solution theory (NIAST) coupled with the Dubinin-Astakhov (DA) equation is proposed for volatile organic compounds (VOCs) (acetone, n-hexane, toluene, methanol and n-decane) adsorption equilibria under supercritical carbon dioxide conditions at temperatures from 313 to 353. K and at pressures from 4.2 to 15.0. MPa. Pure components adsorption data of the each adsorbate were measured by using a gravimetric method, and these pure component data were used to predict the binary systems. The proposed DA-NIAST model could provide accurate predictions at a wide range of temperature and pressure in comparison with the conventional methodologies by combination of the ideal adsorbed solution theory (IAST) and the Langmuir equation.