A Water-Based Synthesis of Hybrid Silica/Hyperbranched Poly(ethylene imine) Nanopowder for Heavy Metal Sorption from Aqueous Solutions

Table 3

Parameters of the pseudo-first-order and pseudo-second-order models of Pb(II), Cu(II), and Zn(II) onto silica nanopowder.

	Pb	Cu	Zn
Pseudo-first-order model
(min^−1)
(mg/g)	4.05	0.45	0.19
	0.626	0.756	0.182
Pseudo-second-order model
(g mg^−1 min^−1)	1.776	0.076	0.153
(mg/g)	3.58	3.51	2.55
	1	0.999	1
(mg/g)	3.58	3.51	2.55