Table 5.

Langmuir and Freundlich isotherm parameters for adsorption of MB and MG onto magnetic nanocomposites.

Sample	Fe3O4-SBA15	Fe3O4-SBA15-COOH-0.05	Fe3O4-SBA15-COOH-0.1
Dye	MB
Langmuir parameters
Qmax (mg g−1)	239.17	254.58	256.09
KL (L mg−1)	0.2544	0.2574	0.3157
R2	0.9928	0.9964	09966
AIC	39.39	35.87	35.83
RL	0.440	0.437	0.387
Freundlich parameters
KF (mg g−1)	65.33	68.02	74.89
1/n	0.3382	0.3523	0.3372
R2	0.8830	0.9244	0.9375
AIC	56.14	54.24	53.42
Dye	MG
Langmuir parameters
Qmax (mg g−1)	30.73	39.28	126.55
KL (L mg−1)	0.0531	0.0423	0.0234
R2	0.9502	0.9848	0.9934
AIC	22.82	18.62	25.50
RL	0.790	0.825	0.895
Freundlich parameters
KF (mg g−1)	4.11	4.16	6.41
1/n	0.4167	0.4588	0.5977
R2	0.9833	0.9866	0.9975
AIC	16.24	17.87	19.58