Using Pomegranate Peel and Date Pit Activated Carbon for the Removal of Cadmium and Lead Ions from Aqueous Solution

Table 5

Pseudo-first-order and pseudo-second-order reaction constants for adsorption of Pb(II) and Cd(II) onto the surface of PPAC and DPAC adsorbents.

	Pseudo-first-order reaction						Pseudo-second-order reaction
	PPAC			DPAC			PPAC			DPAC
	qe	K1	R^2	qe	K1	R^2	qe	K2	R^2	qe	K2	R^2
Pb(II)	6.24	0.029	0.46	12.88	0.035	0.87	20.28	0.003	0.99	13.21	0.001	0.91
Cd(II)	13.15	0.033	0.67	8.50	0.038	0.59	22.37	0.002	0.97	12.00	0.002	0.94