Table 4.

Kinetic parameters of sorption for the metal ions onto zeolite at 25°C.

Metal	Pseudo-first-order				Pseudo-second-order
	q e exp⁡ (mg/g)	q e cal (mg/g)	K 1 (min−1)	R 1 2	q e cal (mg/g)	K 2 (g/mg min)	R 2 2
Co+2	61.60	10.06	−0.3705	0.8357	61.95	0.2326	0.9999
Cu+2	75.50	10.24	−0.6458	0.8170	77.57	0.1123	0.9994
Fe+2	76.50	16.76	−0.5954	0.7651	80.05	0.0274	0.9999
Cd+2	97.80	35.45	−0.7452	0.8337	98.32	0.2650	1