Green Synthesis of S- and N-Codoped Carbon Nanospheres and Application as Adsorbent of Pb (II) from Aqueous Solution

Table 5

Thermodynamic parameters of adsorption of Pb (II).

Metal	ΔH (kJ·mol^−1)	ΔG (kJ·mol^−1)	ΔS (J·mol^−1·K^−1)	Equilibrium constant (K)
Pb (II)	−5.441	−1.633	+37.193	731.200