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A metal polyphenol-modified TiO2 photocatalytic membrane（（TA-Fe3+）/TiO2-PVDF）was prepared by a layer-by-layer self-assembly method using polyvinylidene difluoride（PVDF）membranes as the substrate, and an in situ photocatalytic membrane filtration system was constructed to degrade tetracycline in water. The structures of the photocatalytic membranes were characterized by SEM, EDS, XRD, FTIR and contact angle meter, and all the characterization results proved the successful coating of（（TA-Fe3+）/TiO2-PVDF）and the enhanced hydrophilicity of the membrane surfaces; and tetracycline as a representative of the antibiotics was selected for the study of the degradation performance, which was achieved at a low dosage（50mg/L）of peroxydisulfate（PMS）, a transmembrane pressure of 5 kPa, and an in situ photocatalytic membrane filtration system to degrade tetracycline in water. 250 mW/cm2visible light intensity, the tetracycline degradation rate was always maintained at 80% during 1h operation, the average removal rate of tetracycline was 7.34g/h, and the water flux only decreased by 6% compared with that of the original PVDF membranes, which is suitable for neutral and weakly acidic conditions, and basically unaffected by common ions in the water column and natural organic matter; finally, the mechanism of tetracycline degradation by（TA-Fe3+）/TiO2-PVDF membranes was investigated by active species capture assay and EPR, and it was found that photocatalysis synergistically with PMS oxidation produced 1O2, h+, O2-· and SO4·- as the main active species, and degraded tetracycline by both the free radical and non-free radical pathways.
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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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