Adsorption from some binary solutions on silica gel

Abstract

Excess adsorption data of the binary mixtures benzene(A)+ 1,2-dichloroethane(B), toluene(A)+ 1,2dichloroethane(B) and o-xylene(A)+ 1,2-dichloroethane(B) on silica gel have been measured. While n₀<img src='/image/spc_char/delta.gif' border=0> <i>x</i>¹_A/mvalues for benzene(A)+ 1,2-dichloroethane(B) and <i>o</i>-xylene(A) + 1,2-dichloroethane(B) mixtures are positive over the entire concentration range, those for toluene(A)+ 1,2-dichloroethane(B) mixture are positive upto <i>x</i>^e_A< 0.40 and become negative at <i>x</i>^e_A > 0.40. The data have been analysed in terms of Rudzinskii approach which has been observed to best reproduce the experimental excess adsorption data if self-interaction energies of the pure components are evaluated from Sanchez and Lacombe theory of fluids and the adsorption energy data are evaluated using statistical mechanic model of adsorption.