Nickel Removal from Aqueous Solution Using Chemically Treated Mahogany Sawdust as Biosorbent

Table 3

Isotherm constants and correlation coefficients for the adsorption of nickel on sawdust.

Isotherms	Parameters	T (K)
		298	308	318
Langmuir	qmax (mg/g)	13.42	14.03	14.43
	b (L/mg)	0.031	0.029	0.024
	R^2	0.9856	0.9904	0.9835
Freundlich	1/n	0.568	0.554	0.558
	Kf	0.696	0.720	0.704
	R^2	0.9740	0.9256	0.9596
Dubinin–Radushkevich	Kad (mol^2/kJ^2)	0.1732	0.2006	0.165
	qs (mg/g)	22.43	27.36	19.70
	E (kJ/mol)	1.699	1.579	1.741
	R^2	0.9016	0.9031	0.7948