Valorization of Wasted Black Tea as a Low-Cost Adsorbent for Nickel and Zinc Removal from Aqueous Solution

Table 3

The parameters of Freundlich and Langmuir adsorption equations.

Adsorbate	Freundlich constants				Langmuir constants
	(mg/g)			AAD%	(mg/g)			AAD%
Ni^2+	20.80	0.24	0.976	3.49	90.91	0.224	0.949	3.37
Zn^2+	16.22	0.36	0.994	2.92	166.67	0.133	0.917	3.53