Adsorption isotherm parameters achieved using Langmuir, Freundlich and Redlich–Peterson models.

Adsorbent	Langmuir model			Freundlich model			Redlich–Peterson model
	q m (mg g−1)	a L ×10−2(L mg−1)	R 2	K F (mg(1−1/n) L1/ng−1)	n	R 2	a R (L g−1)	K R ×10−5 (L mg−1)	b	R 2
NiFe2O4 nanoparticles	60.0 ± 4.9	1.18 ± 0.185	0.975	2.34 ± 0.62	1.77 ± 0.04	0.926	0.488 ± 0.0087	2.74 ± 0.14	2.09 ± 0.098	0.999
NiFe2O4/PAOT nanocomposite	245.8 ± 19.3	4.91 ± 0.783	0.972	23.06 ± 4.48	1.87 ± 0.05	0.911	8.384 ± 0.3280	119.72 ± 7.53	1.84 ± 0.151	0.998