Magnetite-Functionalized Horse Dung Humic Acid (HDHA) for the Uptake of Toxic Lead(II) from Artificial Wastewater

Table 3

Isotherm parameters of Pb(II) adsorption onto MHDHA.

Isotherm models	Isotherm parameters
Langmuir	(×10^−5mol/g)	(mg/g)	(L/mol)	(kJ/mol)
	27.82	57.64	23115.11	24.90	0.9936
Freundlich	(×10^−5mol/g)		(mg/g)
	465.90		1285.87	2.51	0.9800
Temkin	(J/mol)		(L/g)
	234.22		1.59		0.9672
Dubinin-Radushkevich (D-R)	(×10^−5mol/g)	(mg/g)	(×10^−9mol^2/J^2)	(kJ/mol)
	91.45	189.48	2.29	14.78	0.9879