Evaluation of Agrowaste Species for Removal of Heavy Metals from Synthetic Wastewater

Table 1

Parameters of models (Langmuir and Freundlich isotherm) for Cu, Se, Zn, Pb, and Cr adsorption on the moringa (L and B), tea, lupines, and sugarcane straw.

	Freundlich isotherm model						Langmuir isotherm model
		Moringa ML	Moringa MB	Tea	Sugarcane straw	Lupines		Moringa ML	Moringa MB	Tea	Sugarcane straw	Lupines
Pb	K F	12.5	9.8	11.4	6.6	10	K L	18.5	19	6.0	5.5	2.8
	n	4.2	4.2	3.0	4.4	2.6	q m	14.5	11.4	15.0	8.9	16.1
	R ^2	0.871	0.874	0.969	0.949	0.959	R^2	0.931	0.818	0.933	0.972	0.970
Cu	K F	3.5	1.8	3.0	4.8	3.5	K L	2.1	1.1	0.9	3.1	2.8
	n	3.3	2.0	2.3	3.6	3.6	q m	5.7	4.3	5.8	7.1	5.7
	R ^2	0.975	0.943	0.940	0.896	0.896	R^2	0.969	0.842	0.945	0.897	0.924
Cr	K F	4.5	4.5	7.0	7.0	3.8	K L	2.5	4.6	8.0	1.7	4.6
	n	4.3	4.0	3.9	3.0	6.5	q m	6.8	5.6	8.8	12.7	4.9
	R ^2	0.776	0.944	0.946	0.845	0.775	R ^2	0.964	0.803	0.811	0.993	0.957
Zn	K F	6.5	5.0	6	5	5	K L	4.1	1.7	14.3	2.4	2.9
	n	4.0	3.1	7.8	3.5	3.53	q m	9.3	8.1	7.1	6.8	6.9
	R ^2	0.905	0.936	0.818	0.958	0.959	R ^2	0.981	0.983	0.925	0.980	0.96
Se	KF	3.5	3.9	3.9	2.8	3.8	K L	1.0	1.2	4.1	1.7	5.3
	n	2.2	2.5	4.2	2.8	4.8	q m	8.9	8.1	4.8	4.9	5.2
	R^2	0.977	0.965	0.984	0.984	0.966	R ^2	0.988	0.991	0.833	0.927	0.841