Table 3 Kinetic parameters for Cu(II), Zn(II), Cd(II), and Pb(II) ions sorption on ST20-ALG
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 | 6.29 | 7.21 | 6.23 | 8.38 |
k 1 | 0.022 | 0.003 | 0.028 | 0.001 | |
t 1/2 | 0.04 | 0.008 | 0.007 | 0.009 | |
R 2 | 0.9532 | 0.8573 | 0.9686 | 0.9387 | |
PSO | q 2,cal | 10.19 | 11.47 | 12.75 | 19.99 |
k 2 | 0.020 | 0.013 | 0.034 | 0.063 | |
h | 2.040 | 1.691 | 3.957 | 2.200 | |
t 1/2 | 0.002 | 0.0011 | 0.003 | 0.0032 | |
R 2 | 0.9913 | 0.9986 | 0.9984 | 1.0000 | |
IPD | ki1 (mg g−1 min−1/2) | 0.94 | 1.29 | 0.64 | 1.28 |
C 1 | 3.25 | 1.92 | 5.84 | 3.95 | |
R 2 1 | 0.9532 | 0.9008 | 0.9399 | 0.9642 | |
ki2 (mg g−1 min−1/2) | 0.62 | 0.59 | 0.44 | 0.64 | |
C 2 | 4.27 | 5.02 | 6.65 | 16.25 | |
R 2 2 | 0.9142 | 0.7714 | 0.9489 | 0.8927 | |
ki3 (mg g−1 min−1/2) | 0.54 | 0.23 | 0.49 | 0.03 | |
C 3 | 4.67 | 7.94 | 6.12 | 19.50 | |
R 2 3 | 0.9566 | 0.5984 | 0.9692 | 0.8214 | |
EM | a | 8.12 | 7.45 | 5.97 | 9.79 |
b | 0.59 | 0.57 | 0.75 | 0.64 | |
R 2 | 0.9516 | 0.9494 | 0.9123 | 0.8688 |