α and γ Alumina Spheres for Azo Dye (Allura Red) Removal from Aqueous Media

Table 3

Parameters obtained from the adjustment of Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models applied to the adsorption process of OTC on the γ-Alu spheres in distilled and ionic water.

Isotherm model	Distilled water
	Parameters
Langmuir		1.7701
	(mg/g)	7.6189
		0.9406
Freundlich		0.6360
		4.5980
		0.9895
Temkin		1.4810
		1672.9
		0.8205
Dubinin-Radushkevich	(mg/g)	7.6189
	(mol^2/kJ^2)	-3 × 10^-9
		0.9421
Isotherm model	Ionic water
	Parameters
Langmuir		1.4089
	(mg/g)	7.5434
		0.9391
Freundlich		0.7202
		3.8771
		0.9948
Temkin		0.4693
		5279.2
		0.8987
Dubinin-Radushkevich	(mg/g)	7.5434
	(mol^2/kJ^2)	-4 × 10^-9
		0.9741