Evaluation of Geophagy Clay Capacity in Adsorbing Cd²⁺ and Pb²⁺ for Water Treatment in Southeast Nigeria

Table 2

Adsorption thermodynamics parameters for the adsorption of Cd²⁺ and Pb²⁺ by clay-1 and clay-2.

Clay	Metal ion	Temp (K)	Gibb’s free energy (J/mol)	(KJ mol^−1)	(JK^−1mol^−1)
1	Cd^2+	298	−2123.193	341	−99.1
		308	−2111.598
		318	−656.789
	Pb^2+	298	2339.263	4196	−73.3
		308	2725.137
		318	4322.052
2	Cd^2+	298	−6217.108	1112	−0.213
		308	−848.772
		318	−585.724
	Pb^2+	298	−1662.206	1059	−0.249
		308	1826.683
		318	1984.941