Adsorption Mechanism and Electrochemical Characteristic of Methyl Blue onto Calcium Ferrite Nanosheets

Table 1

Adsorption kinetics parameters of magnetic CaFe₂O₄ nanosheets with concentrations of MB solutions.

Kinetics model	Parameter	Initial MB concentration (mg/L)
		800	900	1000	1100
Pseudo-first-order model	R^2	0.6987	0.7326	0.7438	0.7495
	k1	0.4245	0.4442	0.3871	0.2220
	Adj. R-square	0.6686	0.7059	0.7182	0.7245
Pseudo-second-order model	R^2	0.9924	0.9878	0.9940	0.9898
	k2	0.0171	0.0190	0.0097	0.0160
	Adj. R-square	0.9916	0.9866	0.9935	0.9888
Intraparticle diffusion model	R^2	0.7103	0.6476	0.7120	0.7369
	ki	0.3957	0.3417	0.6932	3.8120
	Ci	0.5	0.5	0.5	0.5
	Adj. R-square	0.6813	0.6123	0.6833	0.7106