Several kinetic models are used to examine the controlling mechanism of the adsorption process such as chemical reaction and diffusion control. The kinetics of adsorption of RR2 dye on AC are described by using first-order and pseudo-second-order model (Figure 7 and Table 6).
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Table 6
Comparison of pseudo-first-order, pseudo-second-order, and intraparticle diffusion adsorption rate constants
| Kinetic models | |||||||
|---|---|---|---|---|---|---|---|
| Pseudo-first-order | Pseudo-second-order | Intraparticle diffusion | |||||
| K1 | qe | R2 | K2 | qe | R2 | Kid | R2 |
| 0.04 | 870.96 | 0.75 | 0.009 | 4.08 | 0.99 | 354.88 | 0.97 |
| Kinetic models | |||||||
|---|---|---|---|---|---|---|---|
| Pseudo-first-order | Pseudo-second-order | Intraparticle diffusion | |||||
| K1 | qe | R2 | K2 | qe | R2 | Kid | R2 |
| 0.04 | 870.96 | 0.75 | 0.009 | 4.08 | 0.99 | 354.88 | 0.97 |
Figure 7
(a) Pseudo-second-order, (b) pseudo-first-order, and (c) intraparticle diffusion kinetic plots for the adsorption of RR2 onto prepared adsorbent (pH 7, adsorbent dosage of 6.25 g L−1 at 25 °C).
Figure 7
(a) Pseudo-second-order, (b) pseudo-first-order, and (c) intraparticle diffusion kinetic plots for the adsorption of RR2 onto prepared adsorbent (pH 7, adsorbent dosage of 6.25 g L−1 at 25 °C).