Mixed Maghemite/Hematite Iron Oxide Nanoparticles Synthesis for Lead and Arsenic Removal from Aqueous Solution

Table 2

The isotherm fitting parameters of different models of Pb and As adsorption on iron oxides; IO-NH, IO-K, and IO-NH.

	Heavy metal	Langmuir isotherm			Freundlich isotherm
		a	b	R^2	k	n	R^2
IO-NH	Pb	12.58	1.36	0.99	5.94	2.65	0.90
	As	10.28	0.25	0.95	1.54	1.51	0.92
IO-K	Pb	15.45	1.11	0.96	6.01	2.05	0.83
	As	14.32	0.53	0.97	4.24	2.35	0.82
IO-Na	Pb	18.37	1.61	0.98	9.17	2.79	0.84
	As	16.05	0.50	0.97	4.67	2.33	0.86