ADSORPTIVE MECHANISM ON ACTIVATED CARBON IN THE LIQUID-PHASE .2. CHARACTERISTIC ADSORPTION CURVE ON ACTIVATED CARBON IN GAS AND LIQUID-PHASES

The characteristic adsorption curves on activated carbon with different pore size distributions have been determined in gas and liquid phases. The adsorption isotherms of benzene in gas phase were measured and the parameters in the Dubinin-Astakhov equation were calculated. The linear relationship exists between nG and E0. The adsorption volume (WG*) was calculated from the limiting vapor adsorption at P/P0→1. The linear relationships exist between W*G/W*G and nG or E0. In liquid phase, the adsorption isotherms of anisole from aqueous solution were measured and correlated by the following equation: where ɛ31 = RT In CS/C, Cs solubility, and C an equilibrium concentration. The linear relationship exist between nL and EL, and between W*G/W*G and nL or EL. The values of n and E in liquid phase are smaller than those in gas phase. The magnitude of WL0, is similar to that of WG*. This suggests that in liquid phase, pores, having such large diameters as occur capilary condensation, are also utilized for an adsorption. © 1979, The Chemical Society of Japan. All rights reserved.