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Using florfenicol（FFC）as the target pollutant, schwertmannite and jarosite as catalysts synthesized by the mediation of A.ferrooxidans to investigate their effectiveness in catalyzing Fenton-like reactions for FFC degradation. Initially, the two minerals were characterized using SEM, XRD, FTIR and BET analysis. Subsequently, the impact of four key variables—mineral dosage,H2O2 concentration, pH, and temperature—on FFC degradation was studied. Finally, the degradation mechanism of FFC and the reusability of the minerals were analyzed. The results indicated that the biosynthesized schwertmannite and jarosite were pure minerals, with average particle diameters of approximately 2.5µm and 5.0µm and jarosite exhibiting more noticeable aggregation. The specific surface areas of schwertmannite and jarosite were 116.67m2/g and 87.52m2/g, respectively, with total pore volumes of 0.098cm3/g and 0.065cm3/g and average pore diameters of 2.986nm and 2.867nm. Increasing the mineral dosage enhanced the degradation efficiency of FFC by both minerals. The degradation efficiency of FFC initially increased and then decreased with an increase in the H2O2 concentration. Under acidic conditions, both minerals exhibited better degradation effects. The degradation rate increased with rising temperature. Under the combined experimental conditions of a mineral dosage of 10g/L, an H2O2 concentration of 200mg/L, an pH of 3.00, and a temperature of 36℃, combined with Liquid Chromatography-Mass Spectrometry（LC-MS）test results, the degradation mechanism of FFC by the two minerals was inferred as follows: The minerals adsorbed H2O2 onto their surfaces, catalyzing its decomposition to produce hydroxyl radicals（·OH）, which oxidized FFC into intermediate products, ultimately leading to inorganic substances. A total of six intermediate products were detected during the Fenton-like reaction, including small organic molecules such as alcohols, aldehydes, or carboxylic acids containing benzene rings, amide groups, or amine groups, as well as methyl phenyl sulfone. After 10cycles of reuse, the crystal structure and functional groups of the two minerals remained unchanged, demonstrating good stability.
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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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