Indigo Carmine and 2,6-Dichlorophenolindophenol Removal Using Cetyltrimethylammonium Bromide-Modified Palm Oil Fiber: Adsorption Isotherms and Mass Transfer Kinetics

Table 2

Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin parameters for IC and 2,6-DCPIP adsorption onto CTAB-modified POF.

Dyes	Langmuir				Freundlich				Dubinin–Radushkevich				Temkin
	KL (L·μmol^−1)	(μmol·g^−1)		r^2	Kf (L·g^−1)			r^2	E (kJ·mol^−1)	(μmol·g^−1)		r^2	Δq (kJ·mol^−1)	KT (L·μmol^−1)		r^2
IC	0.270	275.426	14.105	0.859	0.003	0.231	4.398	0.953	17.165	736.670	4.812	0.946	14.935	6.329	5.563	0.934
2,6-DCPIP	0.014	230.423	3.462	0.967	0.046	0.629	6.291	0.938	9.880	2018.255	5.306	0.948	10.712	0.120	1.196	0.986