Table 3.

Kinetic parameters for Cu (II) removal using Zn-AL and Zn-ST as adsorbent.

Sample	qe, exp (mg g−1)	Pseudo-first order				Pseudo-second order
		C0 (mg L−1)	qe (mg g−1)	10−2 k1 (h−1)	$r_{\mathrm{\text{i1}}}^2$	qe (mg g−1)	10−2 k2 (g mg−1h−1)	$r_{\mathrm{\text{i2}}}^2$
Zn-AL	9.87	50	6.77	2.63	0.8301	9.83	1.52	0.9973
Zn-ST	9.57	50	2.64	2.16	0.7521	9.67	2.65	0.9991