Silica Aerogel-supported Hydrozincite and Carbonate-intercalated Hydrotalcite for High-efficiency Removal of Pb(II) Ions by Precipitation Transformation Reactions

Table 3 The pseudo-first-order and pseudo-second-order kinetic model parameters for the adsorption of Pb(II) on SA-Zn-HZ and SA-Zn₃Al-HT

Adsorbent	q _e,exp (mg/g)	Pseudo-first-order model			Pseudo-second-order model
Adsorbent	q _e,exp (mg/g)	k ₁ × 10³ (min⁻¹)	q _e (mg/g)	R ²	k ₂ × 10³ (g/mg min)	q _e,cal (mg/g)	R ²
SA-Zn-HZ	680.8	4.50	197.4	84.4%	0.058	694.4	99.9%
SA-Zn₃Al-HT	537.8	3.55	273.2	82.8%	0.026	565.0	99.7%