Adsorption kinetics parameters achieved using pseudo first order and second order models.

Adsorbent	Pseudo-first order			Pseudo-second order
	k 1 × 10−2 (min−1)	q e1 (mg g−1)	R 2	k 2 × 10−4 (g (mg min)−1)	q e2 (mg g−1)	q exp (mg g−1)	R 2
NiFe2O4 nanoparticles	1.6 ± 0.015	20.6 ± 1.14	0.959	6.3 ± 0.51	25.1 ± 1.10	20.1	0.987
NiFe2O4/PAOT nanocomposite	2.9 ± 0.060	32.4 ± 1.36	0.885	16.4 ± 3.20	72.2 ± 1.32	69.2	0.998