Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Table 3

Parameters of isotherms for the removal of Cr(III) or Cr(VI) by kaolin in single and binary solutions.

Adsorbed solution	Langmuir model			Freundlich model
	(L·g^−1)	(mg·g^−1)		(mg·L·g^−1)	1/n
Cr(III)	0.083	1.018	0.991	0.308	0.764	0.958
Cr(III)-Cu	0.595	1.441	0.997	0.493	0.554	0.959
Cr(VI)	3.367	0.878	0.985	0.628	0.293	0.956
Cr(VI)-Cu	0.134	0.595	0.978	0.070	0.710	0.912