Evaluation of Activated Carbons Prepared from Bioprecursors for the Removal of Cadmium and Chromium (VI)

Table 4

Thermodynamic parameters of Cd and Cr(VI) adsorption on CA1 and CA2 at different temperatures.

Adsorbent	Element		ΔH0 (kJ/mol)	ΔS0 (kJ/mol·K)	ΔG0 (kJ/mol)
					293	303	313	323
CA1	Cd	0.903	6.102	24.136	−7.064	−7.305	−7.547	−7.788
	Cr(VI)	0.975	8.937	25.681	−7.515	−7.772	−8.029	−8.286
CA2	Cd	0.909	11.191	14.358	−5.196	−5.339	−5.483	−5.626
	Cr(VI)	0.982	8.597	15.447	−4.517	−4.672	−4.826	−4.981