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

Table 3

Kinetics parameters of adsorption of Pb (II).

Metal	Pseudo first order			Pseudo second order
	k1	qe	R^2	k2	qe	h	R^2
Pb (II)	0.086	2.298	0.921	0.191	23.809	108.690	1.000