Thermodynamic parameters for lead removal onto G–CdO, CdO and G.

Adsorbents	Temperature (K)	K d (L mg−1)	ΔG0 (kJ mol−1)	ΔH0 (kJ mol−1)	ΔS0 (J mol−1 K−1)
G–CdO	298	1.82	−1.48	37.59	131.8
	302	2.67	−2.46
	307	3.23	−2.99
	310	3.3	−3.07
CdO	298	1.5	−1.0	42.35	145.38
	302	2.06	−1.81
	307	2.67	−2.5
	310	2.9	−2.74
G	298	0.14	4.81	−43.36	−161.02
	302	0.14	4.95
	307	0.09	6.11
	310	0.08	6.63