Table 3.

Isotherm parameters for the adsorption of Fe(II) and Mn(II) on the RHA.

	Freundlich isotherm model			Langmuir isotherm model			D-R isotherm model
	K F	1/n	R 2	K L (L/mg)	q m (mg/g)	R 2	E (kJ/mol)	q m (mg/g)	R 2
Fe(II)	2.649	0.503	0.901	1.032	6.211	0.995	2.53	4.49	0.917
Mn(II)	1.379	0.345	0.892	0.907	3.016	0.986	2.27	2.54	0.918