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Table 2

Kinetic parameters of MMCN adsorption at different initial Pb(II) concentrations

C₀ (mg/L)	Q_exp (mg/g)	Pseudo-first-order			Pseudo-second-order
C₀ (mg/L)	Q_exp (mg/g)	Q_cal (mg/g)	k₁ (min⁻¹)	R²	Q_cal (mg/g)	k₂ (min·mg/g)	R²
30	54.17	14.42	0.016	0.92	54.76	0.0038	0.9997
100	115.82	30.11	0.020	0.69	117.92	0.0018	0.9998
250	147.81	38.32	0.017	0.72	149.70	0.0014	0.9996

C₀ (mg/L)	Q_exp (mg/g)	Pseudo-first-order			Pseudo-second-order
C₀ (mg/L)	Q_exp (mg/g)	Q_cal (mg/g)	k₁ (min⁻¹)	R²	Q_cal (mg/g)	k₂ (min·mg/g)	R²
30	54.17	14.42	0.016	0.92	54.76	0.0038	0.9997
100	115.82	30.11	0.020	0.69	117.92	0.0018	0.9998
250	147.81	38.32	0.017	0.72	149.70	0.0014	0.9996

Q_exp, the adsorption quantity of MMCN from experiment.

Q_cal, the adsorption quantity of MMCN from calculation through fitting curve.