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Table 1

Kinetic parameters for the adsorption of Cd(II) on Fe3O4/PP (pH 7.0, Cd(II) = 20 mg/L, adsorbent dose = 3.0 g, contact time = 12 h, temp. = 298 K)

Initial concentration of Cd(II) (mg/L)Pseudo first-order model
Pseudo second-order model
k1 (min−1)qe,cal (mg/g)R2k2 (g/mg/min)qe,cal (mg/g)h (mg/g/min)R2
0.0024 0.743 0.708 0.0132 0.449 0.0027 0.999 
20 0.0022 0.523 0.589 0.0778 0.754 0.0442 0.999 
40 0.0036 0.369 0.778 0.0878 1.144 0.1150 0.997 
Initial concentration of Cd(II) (mg/L)Pseudo first-order model
Pseudo second-order model
k1 (min−1)qe,cal (mg/g)R2k2 (g/mg/min)qe,cal (mg/g)h (mg/g/min)R2
0.0024 0.743 0.708 0.0132 0.449 0.0027 0.999 
20 0.0022 0.523 0.589 0.0778 0.754 0.0442 0.999 
40 0.0036 0.369 0.778 0.0878 1.144 0.1150 0.997 

Note: qe,cal is the equilibrium adsorption capacity calculated by the kinetic models.

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