Extraction and Characterisation of African Star Apple (Chrysophyllum albidum) Seed Oil and the Adsorptive Properties of the Fruit Shell in Ghana

Table 3

The calculated parameters of the pseudo-first-order and pseudo-second order models for the adsorption methyl orange using activated ZnCl₂, MgCl₂ and CaCl₂.

Parameters	Methyl Orange	Methyl Orange	Methyl Orange
	ZnCl2	MgCl2	CaCl2
Pseudo-first order kinetics
k1, min^−1	0.52	0.68	0.59
, mg/g	0.32	0.17	0.18
R^2	0.889	0.796	0.941
Pseudo-second order kinetics
, mg/g	0.43	0.17	0.28
k2, g/mg min	1.45	3.44	0.41
H	0.27	0.10	0.03
R^2	0.9714	0.973	0.596