Table 2 Kinetic parameters for Pb(II) adsorption by PG.
From: Removal of toxic lead from aqueous solution using a low-cost adsorbent
Concentration (mg/L) | 10 | 20 | 30 |
|---|---|---|---|
qe, exp (mg/g) | 0.64 | 1.23 | 1.80 |
Pseudo-first order model | |||
qe (mg/g) | 0.67 | 1.28 | 1.9 |
k1 (min-1) | 0.11 | 0.1 | 0.11 |
\({\mathrm{R}}_{\mathrm{Adj}}^{2}\) | 0.96 | 0.95 | 0.93 |
R2 | 0.97 | 0.94 | 0.94 |
RSS | 0.00 | 0.02 | 0.06 |
Pseudo-second order model | |||
qe (mg/g) | 0.81 | 1.57 | 2.39 |
k2 (g/mg min) | 0.14 | 0.07 | 0.04 |
\({\mathrm{R}}_{\mathrm{Adj}}^{2}\) | 0.90 | 0.88 | 0.87 |
R2 | 0.92 | 0.90 | 0.89 |
RSS | 0.00 | 0.04 | 0.12 |
Interparticle diffusion model | |||
k3 | 0.08 | 0.16 | 0.25 |
C | 0.17 | 0.29 | 0.33 |
\({\mathrm{R}}_{\mathrm{Adj}}^{2}\) | 0.69 | 0.67 | 0.67 |
R2 | 0.75 | 0.73 | 0.73 |
RSS | 0.03 | 0.12 | 0.30 |
