Table 2.

Constant isotherms and parameters determined for the CV dye adsorption process.

Models		Adsorbent
	Parameters	ACL	ACL/Fe3O4
Langmuir	qm (mg/g)	23.64	35.31
	KL (L/mg)	1.469	1.366
	RL	0.008–0.063	0.009–0.68
	R2	0.9704	0.9826
	RMSE	1.122	1.435
Freundlich	n	6.5	4.595
	Kf (mg/g (L/mg)1/n)	13.78	18.25
	R2	0.78	0.891
Dubinin–Radushkevich (D–R)	RMSE	3.06	3.591
	E (kJ/mol)	1.972	2.364
	qm (mg/g)	22.53	31.91
	β (mol2/J2)	1.285 × 10−7	8.969 × 10−8
	R2	0.9838	0.8828
Temkin	RMSE	0.8293	3.723
	bT (kJ/mol)	0.837	0.45
	AT (L/g)	94.77	30.79
	R2	0.8415	0.9737
	RMSE	2.597	1.904