Page 50 - Adsorption Technology & Design, Elsevier (1998)
P. 50
Fundamentals of adsorption equilibria 47
6000
_1t
5000
4000
O
E
~a
3000
2000
1000
0 0.1 0.2 0.3 0.4
v (cma/g)
Figure 3.7(a) (a) Polanyi characteristic curve t(v) for C2F4 oil activated carbon +,
33.3~ (critical temperature); N, 0~ V, -28~ A, - 40~ O,
-76.3~ (source: Dubinin 1960, p. 235).
3.3.6 The Gibbs adsorption isotherm
Willard Gibbs (1928), in his comprehensive treatment of the thermo-
dynamics of systems at equilibrium, supposed that the 'adsorbent is
inert in a thermodynamic context. The Gibbs function for a mobile
adsorbate (an adsorbate which is not localized at particular adsorption sites)
