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Comparative synergy indices of the hybrid processes for the overall degradation of caffeine (C0 = 5 mg L−1) after 60-min reaction at pH 4.
| HHybrid Process (Symbol) | S |
|---|---|
| UUS/UV (P2) | 0.21 |
| UUS/UV-H2O2 (P4) | 0.25 |
| UUV/TiO2 (P6) | 3.72 |
| UUS/UV/TiO2 (P7) | 4.47 |
| UUV-H2O2/TiO2 (P8) | 65.11 |
| UUS/UV-H2O2/TiO2 (P9) | 2.82 |
