Table 8 Intraparticle diffusion and Boyd’s kinetics constants.
Activated carbon | Co (mg/L) | Qe,exp (mg/g) | Intraparticle diffusion model | Boyd’s model | ||||
---|---|---|---|---|---|---|---|---|
kd (mg/g min) | C (mg/g) | R2 | Intercept | Di (cm2/s) | R2 | |||
Methylene blue | ||||||||
TAC2 | 20 | 19.9 | 0.147 | 17.0 | 0.8118 | 1.22 | 5.73 × 10–9 | 0.9355 |
100 | 95.6 | 0.982 | 71.9 | 0.8178 | 0.95 | 7.17 × 10–9 | 0.9521 | |
TAC3 | 20 | 19.8 | 0.176 | 15.9 | 0.8583 | 1.02 | 5.73 × 10–9 | 0.9488 |
100 | 89.9 | 0.994 | 64.4 | 0.9395 | 0.59 | 7.17 × 10–9 | 0.9638 | |
TAC4 | 20 | 15.6 | 0.177 | 10.9 | 0.7714 | 0.65 | 5.73 × 10–9 | 0.9066 |
TAC5 | 20 | 18.4 | 0.289 | 11.1 | 0.8027 | 0.69 | 5.02 × 10–9 | 0.9650 |
TAC6 | 20 | 19.8 | 0.260 | 13.3 | 0.7852 | 0.78 | 5.73 × 10–9 | 0.9661 |
Congo red | ||||||||
TAC2 | 20 | 17.0 | 0.489 | 2.89 | 0.9340 | 0.12 | 4.30 × 10–9 | 0.9829 |
TAC3 | 20 | 17.8 | 0.424 | 5.50 | 0.9313 | 0.29 | 4.30 × 10–9 | 0.9855 |
TAC4 | 20 | 14.9 | 0.461 | 1.23 | 0.9636 | 0.05 | 4.30 × 10–9 | 0.9670 |
TAC5 | 20 | 19.6 | 0.438 | 7.50 | 0.8788 | 0.36 | 5.02 × 10–9 | 0.9830 |
100 | 76.1 | 1.368 | 38.5 | 0.8371 | 0.55 | 4.30 × 10–9 | 0.9537 | |
TAC6 | 20 | 18.5 | 0.523 | 3.78 | 0.9026 | 0.17 | 5.02 × 10–9 | 0.9945 |
100 | 66.8 | 1.719 | 18.5 | 0.9027 | 0.07 | 6.45 × 10–9 | 0.8915 |