Research Article
Photocatalytic Degradation of Pesticides in Natural Water: Effect of Hydrogen Peroxide
Table 4
Characterization of samples of surface wáter fortified with pesticides in photocatalytic treatments.
| Initial sample |
| Physical-chemical parameters |
| pH | 8.0 | Colour (PCU) | 0 | Conductivity (μS cm−1) | 508 | Dissolved oxygen (mg L−1) | 9.9 | Turbidity (NTU) | 69 | Hardness (mg CaCO3 L−1) | 108 | Suspended solids (mg L−1) | 27 | concentration (mg L−1) | 0.15 | Phosphorous (mg L−1) | 0.8 | CN- concentration (mg L−1) | 0.002 | DOC (mg C L−1) | 22 | Toxicity (% inhibition) | 33.6 | Chlorine demand (mg Cl2 L−1) | 6.0 |
| Anion concentrations in solution (mg L−1) |
| Fluorides | 0.1 | Nitrates | 10.8 | Chlorides | 63.8 | Phosphates | <0.2 | Sulphates | 98 |
| Sample after treatment TiO2/radiation |
| Physical-chemical parameters |
| pH | 8.0 | Colour (PCU) | 0 | Conductivity (μS cm−1) | 589 | Dissolved oxygen (mg L−1) | 6.2 | Turbidity (NTU) | 54 | Hardness (mg CaCO3 L−1) | 109 | Suspended solids (mg L−1) | 7 | concentration (mg L−1) | 0.15 | Phosphorous (mg L−1) | 0.4 | CN- concentration (mg L−1) | 0.0015 | DOC (mg C L−1) | 14 | Toxicity (% inhibition) | 18.9 | H2O2 concentration (mg L−1) | 5 | Chlorine demand (mg Cl2 L−1) | 1.0 |
| Anion concentrations in solution (mg L−1) |
| Fluorides | <0.1 | Nitrates | 11.6 | Chlorides | 66.4 | Phosphates | <0.2 | Sulphates | 101.0 |
| Sample after treatment TiO2/H2O2/radiation |
| Physical-chemical parameters |
| pH | 8.0 | Colour (PCU) | 0 | Conductivity (μS cm−1) | 625 | Dissolved oxygen (mg L−1) | 9.8 | Turbidity (NTU) | 56 | Hardness (mg CaCO3 L−1) | 95 | Suspended solids (mg L−1) | 5 | concentration (mg L−1) | 0.15 | Phosphorous (mg L−1) | 0.2 | CN- concentration (mg L−1) | 0.001 | DOC (mg C L−1) | 22 | Toxicity (% inhibition) | 43.3 | H2O2 concentration (mg L−1) | 0.5 | Chlorine demand (mg Cl2 L−1) | 55.6 |
| Anion concentrations in solution (mg L−1) |
| Fluorides | <0.1 | Nitrates | 11.4 | Chlorides | 65.0 | Phosphates | <0.2 | Sulphates | 99.2 |
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