Synthesis of α-MnO₂ Nanomaterial from a Precursor γ-MnO₂: Characterization and Comparative Adsorption of Pb(II) and Fe(III)

Table 3

Kinetic parameters.

Kinetic models	Linear forms	Kinetic parameters
			Pb(II)	Fe(III)
		(mg/g)	109.80	16.80
Pseudo-first-order model		(min^−1)	0.01428	1.3810^−3
			0.5998	0.6873
		(mg/g)	5.433	18.12
Pseudo-second-order model		(gmg^−1min^−1)	0.01108	4.510^−3
			1.000	0.9958
		(mg/g)	109.89	17.92
Intraparticle diffusion model	= +		0.3722	0.0309
			0.0038	0.1759
				0.0017