Thermodynamic Study of Adsorption of Phenol, 4-Chlorophenol, and 4-Nitrophenol on Activated Carbon Obtained from Eucalyptus Seed

Table 2

Langmuir, Freundlich, and Dubinin-Raduskevich-Kaganer models parameter for the adsorption of phenols on ACs at 20°C.

Phenols	ACs	Langmuir			Freundlich			Dubinin-Raduskevich-Kaganer
		mmol g^−1	L mmol^−1		((mmol g^−1) (L mmol^−1)	1/		mmol g^−1
Phenol	ACA15	0.313	0.796	0.98	1.797	0.442	0.98	0.331	19.44	0.97
	ACA30	0.231	0.773	0.98	1.645	0.387	0.97	0.236	17.78	0.97
	ACB15	0.664	2.708	0.99	6.679	0.362	0.98	0.634	22.36	0.99
	ACB30	2.125	10.621	0.99	67.627	0.164	0.99	1.729	26.59	0.94
4-NP	ACA15	0.126	1.892	0.99	4.923	0.175	0.99	0.109	9.76	0.96
	ACA30	0.194	0.716	0.99	1.068	0.453	0.97	0.133	22.35	0.90
	ACB15	1.331	17.110	0.99	51.728	0.252	0.93	1.193	17.78	0.96
	ACB30	2.568	100.641	0.99	134.96	0.148	0.99	2.104	19.88	0.94
4-CP	ACA15	0.598	2.116	0.98	13.290	0.244	0.99	0.439	21.14	0.90
	ACA30	0.648	1.422	0.98	6.980	0.367	0.99	0.585	17.78	0.95
	ACB15	1.944	12.860	0.98	75.339	0.198	0.90	1.869	22.44	0.93
	ACB30	3.888	10.288	0.99	161.09	0.171	0.94	4.273	26.59	0.92