Table 3.
Kinetics models and parameters of MB degradation by photocatalysis and photooxidation using materials.
| Photocatalytic degradation | Condition | Kinetics model | Equation (R2) | Initial rate (ppm/min) | Kinetics constant |
|---|---|---|---|---|---|
| SiO2 | Without H2O2 | Pseudo-zero order | Co-Ct = 6.61.10−3t (0.9587) |
4.85.10−2 | 6.61.10−3 |
| 20TiO2/SiO2 | Without H2O2 | Pseudo-first order | ln (Co/Ct) = -6.96.10−3t (0.9566) |
4.79. 10−2 | 6.96.10−3 |
| 30TiO2/SiO2 | Without H2O2 | Pseudo-first order | ln (Co/Ct) = -7.81.10−3t (0.9344) |
6.25. 10−2 | 1.79.10−2 |
| 40TiO2/SiO2 | Without H2O2 | Pseudo-first order | ln (Co/Ct) = -2.53.10−2t+ 0.480 (0.9645) |
0.175 | 2.53.10−2 |
| 60TiO2/SiO2 | Without H2O2 | Pseudo-first order | ln (Co/Ct) = -3.74.10−2t+ 0.717 (0.9645) |
0.209 | 3.74.10−2 |
| TiO2 | Without H2O2 | Pseudo-first order | ln (Co/Ct) = -2.12.10−2t+ 0.363 (0.9453) |
6.45. 10−2 | 2.12.10−2 |
| SiO2 | With H2O2 | Pseudo-zero order | (Co-Ct = 6.62.10−3t (0.9655) |
4.85.10−2 | 6.61.10−3 |
| 20TiO2/SiO2 | With H2O2 | Pseudo-first order | ln (Co/Ct) = -0.042.10−2t+ 0.4676 (0.9732) |
0.405 | 4.2.10−2 |
| 30TiO2/SiO2 | With H2O2 | Pseudo-first order | ln (Co/Ct) = -0.064.10−2t+ 0.1197 (0.9956) |
0.475 | 6.30.10−2 |
| 40TiO2/SiO2 | With H2O2 | Modified-Freundlich model | (1-Ct/Co) = -1.527t2.30 (0.9954) | 0.488 | 0.235 |
| 60TiO2/SiO2 | With H2O2 | Modified- Freundlich model | (1-Ct/Co) = -0.822t3.91 (0.9954) | 0.599 | 0.374 |
| TiO2 | With H2O2 | Pseudo-first order | ln (Co/Ct) = -2.52.10−2t+ 0.164 (0.9453) |
0.525 | 5.3.10−2 |