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Table 1

Kinetic parameters for the adsorption of Cu(II) and Pb(II) onto CMC-Bz

Kinetic model	Parameter	Metal ion solution
Kinetic model	Parameter	Cu(II)	Pb(II)
Pseudo-first-order	K(mg⁻¹)	0.0282	0.0321
	qe, cal (mg/g)	2.0399	2.0567
	R²	0.9798	0.9502
Pseudo-second-order	K(g mg⁻¹ min⁻¹)	0.0098	0.0097
	qe, Cal (mg/g)	0.1292	0.1122
	R²	0.9946	0.9952
Elovich model	α (mg/g min)	20.645	19.686
	β (g/mg)	1.427	4.6282
	R²	0.9431	0.9392
Intra-particle diffusion model	K_p (mg/g.min^1/2)	6.5053	6.1877
	C	31.073	35.728
	R²	0.8747	0.8668

Kinetic model	Parameter	Metal ion solution
Kinetic model	Parameter	Cu(II)	Pb(II)
Pseudo-first-order	K(mg⁻¹)	0.0282	0.0321
	qe, cal (mg/g)	2.0399	2.0567
	R²	0.9798	0.9502
Pseudo-second-order	K(g mg⁻¹ min⁻¹)	0.0098	0.0097
	qe, Cal (mg/g)	0.1292	0.1122
	R²	0.9946	0.9952
Elovich model	α (mg/g min)	20.645	19.686
	β (g/mg)	1.427	4.6282
	R²	0.9431	0.9392
Intra-particle diffusion model	K_p (mg/g.min^1/2)	6.5053	6.1877
	C	31.073	35.728
	R²	0.8747	0.8668