Table 3.
List of kinetic results for the BB41 adsorption in the dark and pHPZC of the samples.
| Sample | BB41ads-eq
a (μmol) |
k1
b (min−1) |
Rk1 c | k2
d (μmol−1 min−1) |
Rk2 e | kp
f (μmol min−0.5) |
C g (μmol) |
Rkp h | pHPZC i |
|---|---|---|---|---|---|---|---|---|---|
| ZnO | 1.95 | 0.049 | 0.911 | 0.216 | 0.951 | 0.056 | 1.51 | 0.973 | 8.9 |
| C-amorphous | 0.54 | 0.048 | 0.958 | 1.491 | 0.907 | 0.031 | 0.30 | 0.714 | 5.4 |
| C/Zn | 0.87 | 0.037 | 0.946 | 0.746 | 0.940 | 0.025 | 0.68 | 0.704 | 6.6 |
| C/ZnO/Zn | 1.46 | 0.060 | 0.957 | 0.686 | 0.949 | 0.047 | 1.10 | 0.737 | 7.9 |
a BB41 adsorbed after 60 min (pseudo-equilibrium conditions). b Kinetic constant for the BB41 adsorption according to the pseudo-first order. c Regression factor for k1. d Kinetic constant according to the pseudo-second order. e Regression factor for k2. f Kinetic constant according to the IPD model. g C is the layer thickness of molecules close to the surface of the adsorbent according to the IPD model. h Regression factor for the IPD model. i Surface pH estimated by the drift-pH method according to Ref. [25].