Thus, plotting ln b versus 1/T produces linear plots (Fig. 6). From
the slope and intercept values, DS0 and DH0 were obtained. The
negative value of DH0 (41.43 kJ/mol) indicates the exothermic
nature of adsorption. The negative value of DG0 indicates the
spontaneous nature of the process. The negative value of DS0
(155.57 J/mol/K) indicates the higher degree of order obtained
during the adsorption process