. 2024 Sep 19;10(18):e38136. doi: 10.1016/j.heliyon.2024.e38136

Table 8.

Thermodynamic parameters for Pb(II) adsorption onto the four adsorbents.

Sorbent	ΔH^o (kJ/mol)	ΔS^o (J/mol.K)	ΔG^o (kJ/mol)
Sorbent	ΔH^o (kJ/mol)	ΔS^o (J/mol.K)	298 K	308 K	323 K	333 K	343 K
Bentonite y = 191.3975x–0.3308	−1.59	2.57	−2.40	−2.44	−2.48	−2.51	−2.53
Organobentonite y = 569.2723x-0.1752	−4.73	−1.47	−4.29	−4.28	−4.26	−4.24	−4.24
Kaolin y = 221.2933x-1.2718	−1.84	−10.57	1.31	1.42	1.57	1.68	1.79
Organokaolin y = 2918.87x-11.1993	−24.27	−93.11	3.48	4.41	5.80	6.74	7.67