Table 2 Kinetic parameters for Cu(II), Zn(II), Cd(II), and Pb(II) ions sorption on ST20
From: Titania-Coated Silica Alone and Modified by Sodium Alginate as Sorbents for Heavy Metal Ions
Model | Parameter | Cu(II) | Zn(II) | Cd(II) | Pb(II) |
---|---|---|---|---|---|
PFO | q 1,cal | 8.85 | 7.28 | 4.91 | 8.84 |
k 1 | 0.067 | 0.041 | 0.053 | 0.032 | |
t 1/2 | 0.008 | 0.012 | 0.018 | 0.019 | |
R 2 | 0.9321 | 0.9970 | 0.8691 | 0.8219 | |
PSO | q 2,cal | 9.26 | 12.10 | 10.71 | 15.62 |
k 2 | 0.039 | 0.030 | 0.060 | 0.034 | |
h | 3.365 | 4.334 | 6.860 | 8.406 | |
t 1/2 | 0.034 | 0.024 | 0.016 | 0.022 | |
R 2 | 0.9993 | 0.9990 | 0.9995 | 0.9999 | |
IPD | ki1 (mg g−1 min−1/2) | 1.29 | 1.67 | 1.65 | 1.27 |
C 1 | 4.92 | 7.66 | 6.74 | 8.30 | |
R 2 1 | 0.9008 | 0.9614 | 0.9790 | 0.8754 | |
ki2 (mg g−1 min−1/2) | 0. 82 | 0.20 | 0.26 | 0.35 | |
C 2 | 8.14 | 9.54 | 10.86 | 12.51 | |
R 2 2 | 0.9337 | 0.9179 | 0.9348 | 0.8393 | |
ki3 (mg g−1 min−1/2) | 0.23 | 0.13 | 0.08 | 0.09 | |
C 3 | 7.94 | 9.02 | 12.06 | 14.20 | |
R 2 3 | 0.9983 | 0.9696 | 0.9937 | 0.9204 | |
EM | a | 17.23 | 10.24 | 18.65 | 18.64 |
b | 0.57 | 1.47 | 1.30 | 0.77 | |
R 2 | 0.9494 | 0.9437 | 0.9311 | 0.8629 |