Adsorption of Cr(VI) in Aqueous Solution Using a Surfactant-Modified Bentonite

Table 5

Equilibrium isotherm parameters for the adsorption of Cr(VI) onto organobentonite.

Model	25°C	30°C	35°C
Langmuir
(mg/g)	10.04 ± 0.34	10.17 ± 0.29	10.04 ± 0.24
(L/mg)	0.50 ± 0.06	0.38 ± 0.04	0.34 ± 0.02
	0.02–0.19	0.02–0.22	0.03–0.27
	0.998	0.997	0.993
Freundlich
(mg/g)(L/g)^n	3.89 ± 0.43	3.33 ± 0.39	3.31 ± 0.37
	3.68 ± 0.52	3.10 ± 0.43	3.17 ± 0.40
	0.938	0.936	0.923