Table 1.

Kinetic parameters of Pb(II) adsorbed onto ZnO-Nano-A.

Pseudo-First Order					Pseudo-Second Order
Conc (mg L−1)	qe exp (mg g−1)	k1 (min−1)	qe (cal)	R2	k2 (g mg−1min−1)	qe (cal)	R2
10	2.1	4.8 × 10−2	1.3	0.868	22.7 × 10−2	2.2	0.999
20	3.7	2.3 × 10−2	4.2	0.817	10.7 × 10−2	3.8	0.989
30	4.8	1.4 × 10−2	5.8	0.959	4.8 × 10−2	4.5	0.997