Table 2.

Adsorption isotherm parameters of Victoria blue dye.

25 °C	Langmiur Isotherm			Freundlich Isotherm			D-R Isotherm
	qmax (mg.g–1)	b (L.mg–1)	R2	n	Kf (L.mg–1)	R2	qmax (mg.g–1)	Kdr (L.mg–1)	E (kJ.mol–1)	R2
Bi2O3	69	0.07	0.92	0.41	10.8	0.81	48	5.96	0.43	0.91
Bi2O3-CTAB	94	0.2	0.98	0.54	17.8	0.99	66	0.75	1.21	0.84
40 °C	Langmiur Isotherm			Freundlich Isotherm			D-R Isotherm
	qmax (mg.g–1)	b (L.mg–1)	R2	n	Kf (L.mg–1)	R2	qmax (mg.g–1)	Kdr (L.mg–1)	E (kJ.mol–1)	R2
Bi2O3	73	0.47	0.99	0.29	27	0.90	61	0.35	1.76	0.96
Bi2O3-CTAB	105	0.40	1	0.46	28	0.96	74	0.34	1.79	0.93
55 °C	LangmiurIsotherm			Freundlich Isotherm			D-R Isotherm
	qmax (mg.g–1)	b (L.mg–1)	R2	n	Kf (L.mg–1)	R2	qmax (mg.g–1)	Kdr (L.mg–1)	E (kJ.mol–1)	R2
Bi2O3	111	0,30	0.98	0.45	28.5	0.93	76	0.37	1.72	0.96
Bi2O3-CTAB	625	0,027	0.98	0.89	17.3	0.99	88	0,83	1.15	0.94