Adsorption Studies for Arsenic Removal Using Activated Moringa oleifera

Table 2

Equilibrium constants of various isotherm models for the adsorption of arsenic on activated Moringa oleifera.

Isotherm	Isotherm constants	Temperature
		303 K	313 K	323 K
Langmuir	𝐾𝑎 (L/mg)	0.3542	0.4134	0.4901
	𝑞max (mg/g)	6.2313	6.7672	7.3752
	𝑟^2	0.9958	0.9955	0.9945
	SD	0.0257	0.0261	0.0278
Freundlich	𝐾𝑓 (mg/g) (mg/L)^−1/𝑛	34.4215	29.8751	26.0321
	𝑛	1.6572	1.8756	2.1718
	𝑟^2	0.9935	0.9916	0.9862
	SD	0.0070	0.0082	0.0104
Temkin	𝑎 (L/mg)	22.7653	21.7821	20.7317
	𝑏 (mg/g)	14.2619	13.1447	11.8766
	𝑟^2	0.9976	0.9965	0.9935
	SD	0.1002	0.1287	0.1839
D-R	𝛽 (mol^2/J^2)	0.0294	0.0204	0.0116
	𝑞𝑚 (mol/g)	7.4578	8.0825	9.0467
	𝑟^2	0.9736	0.9638	0.9478
	SD	0.0326	0.0387	0.0471
F-H	𝑛FH	0.6034	0.5332	0.4364
	𝐾FH	59.0391	55.1087	49.6569
	𝑟^2	0.9935	0.9916	0.9881
	SD	0.0070	0.0082	0.0099