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Antibiotics are new pollutants in water environment, which have potential threat to aquatic ecological environment and human health. Considering that sulfanilamide antibiotics are difficult to degrade and oxidize and cannot be effectively removed by sewage treatment plants, Fe78Si9B13/H2O2 system was constructed to efficiently and environmentally degrade sulfanilamide antibiotic pollution. Fe78Si9B13/H2O2 system was selected as the best process for efficient degradation of SDZ(sulfadiazine) through a series of experiments with different experimental parameters. The experimental results show that 250 μg/L SDZ can be degraded 100% within 4 min at pH=2, H2O2=50 μmol/L and temperature 25 ℃, and its apparent rate constant (Kobs) can reach 0.99 min-1. The activation energy of SDZ removal in the system is 25.42 kJ/mol. The quenching agent experiments show that the key active substance of Fe78Si9B13/H2O2 system degrades SDZ is hydroxyl radical (·OH). Through high resolution identification of intermediates and toxicity assessment of the intermediates, the results show that all intermediates are substantially reduced or harmless compared to the mother. In addition, the practical application potential of the oxidation degradation system is verified through the actual water degradation experiment.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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