Table 4.

Thermodynamic parameters for the adsorption of Cu(II) on ADP and TADP adsorbents (initial concentration, C₀ was 20 mg/L).

Adsorbents	Concentration mg/L	ΔH°	ΔS°	ΔG° (kJ/mol)
		(kJ/mol)	(J/mol-K)	298 K	308 K	318 K	328 K
ADP	20	2608.34	86.29	−156.34	−566.44	−951.43	−1020.48
	30	2122.10	69.92	−165.79	−341.35	−708.64	−916.92
	40	1810.70	60.54	−419.21	−479.90	−562.61	−821.86
	50	1762.03	59.16	−64.62	−92.97	−423.11	−634.68
TADP	20	1017.01	41.52	−2167.69	−2537.27	−2934.88	−3064.55
	30	704.95	28.99	−1533.09	−1904.93	−2098.57	−2178.40
	40	854.00	34.71	−1786.02	−2073.66	−2380.42	−2550.16
	50	896.01	30.83	−257.90	−409.23	−899.72	−1004.94