Table 2.
The kinetic parameters for Cr(VI) adsorption on the pristine biochar and m-biochar.
| Cr (VI) (mg/L) |
Materials | Pseudo-First-Order Kinetics | Pseudo-Second-Order Kinetics | Intra-Particle Diffusion Model | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
qe (mg/g) |
k1 (h−1) |
R 2 |
qe (mg/g) |
k1 [g/(mg·h)] |
R 2 |
kd1 [mg/(g·h0.5)] |
C1 | R 1 2 |
kd2 [mg/(g·h0.5)] |
C 2 | R 2 2 | ||
| 20 | biochar | 5.40 | 0.08 | 0.86 | 5.55 | 0.04 | 0.92 | 0.56 | 1.34 | 1.00 | 0.12 | 4.38 | 0.66 |
| m-biochar | 5.83 | 0.44 | 0.86 | 6.22 | 0.08 | 0.92 | 0.66 | 1.97 | 1.00 | 0.13 | 5.19 | 0.73 | |
| 40 | biochar | 5.60 | 0.45 | 0.85 | 6.02 | 0.08 | 0.92 | 0.63 | 1.79 | 0.94 | 0.13 | 5.04 | 0.49 |
| m-biochar | 6.47 | 0.59 | 0.88 | 6.74 | 0.12 | 0.94 | 0.72 | 2.52 | 0.97 | 0.06 | 6.41 | 0.80 | |
| 80 | biochar | 6.38 | 0.32 | 0.92 | 6.94 | 0.05 | 0.97 | 1.00 | 1.05 | 0.85 | 0.12 | 5.82 | 0.62 |
| m-biochar | 7.16 | 0.63 | 0.86 | 7.46 | 0.12 | 0.92 | 0.70 | 3.05 | 0.96 | 0.12 | 6.74 | 0.75 | |