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Table 1

Parameters constants of pseudo-first-order and pseudo-second-order kinetic models for Pb(II) sorption by DWHR, at 25 ± 2 °C (initial concentration = 100 mg/L, pH = 5.0, sorbent dosage = 0.1 g, and equilibrium time = 90 min)

Metal ionExperimentalPseudo-first-order model
Pseudo-second-order model
qe,exp (mg/g)qe,cal (mg/g)k1 (min−1)R2qe,cal (mg/g)k2 g/(mg.min)R2
Pb(II) 39.74 5.71 0.0304 0.8475 40.82 0.0127 0.9999 
Metal ionExperimentalPseudo-first-order model
Pseudo-second-order model
qe,exp (mg/g)qe,cal (mg/g)k1 (min−1)R2qe,cal (mg/g)k2 g/(mg.min)R2
Pb(II) 39.74 5.71 0.0304 0.8475 40.82 0.0127 0.9999 
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