Adsorption Ability for Toxic Chromium (VI) Ions in Aqueous Solution of Some Modified Oyster Shell Types

Table 8

Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich isotherm constants for the adsorption of Cr (VI) ions using oyster shell.

Langmuir constant				Freundlich constant
Q0 (mg/g)	KL (L/mg)	RL	R^2	1/n	n	kf (mg/g)	R^2
769.231	0.0016	0.4988	0.9943	1.030	0.971	1.181	0.9767
Temkin constant				Dubinin–Radushkevich constant
AT (L/mg)	bT	B (J/mol)	R^2	Qs (mg/g)	Kad (mol^2/kJ^2)	E (kJ/mol)	R^2
0.9474	608.770	4.0698	0.8324	6.739	0.778	0.80	0.8596