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

Table 4

Pseudo-first order, pseudo-second-order, Elovich, external mass transfer, Boyd, and intraparticle diffusion parameters for IC and 2,6-DCPIP adsorption onto CTAB-modified POF.

Kinetic models	Constants	IC	2,6-DCPIP
Pseudo-first-order model		222.107	102.306
		83.414	71.385
		0.014	0.030
	R^2	0.971	0.907
Pseudo-second-order model		222.107	102.306
		234.192	112.233
		0.002	0.004
	h (μmol·g^−1·min^−1)	100.604	45.683
	(min)	2.328	2.457
	R^2	0.999	0.998
Elovich model	(mmol·g^−1·min^−1)	2.860	0.315
	(g·μmol^−1)	0.038	0.062
	R^2	0.974	0.936
External mass transfer	×	3.370	1.940
	R^2	0.729	0.624
Boyd model		0.073	0.162
		3.070	6.843
	R^2	0.971	0.906
Intraparticle diffusion model	(μmol·g^−1·min^−1/2)	18.322	13.739
	(μmol·g^−1·min^−1/2)	0.974	2.298
	(μmol·g^−1)	121.445	38.601
	(μmol·g^−1)	217.767	90.936
		0.953	0.953
		0.310	0.723