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The iron oxide loaded dolomite composite (DFC) was prepared by ball milling-calcination method and used to degrade malachite green (MG) in water. The degradation performance and mechanism of DFC were investigated. The results indicate that DFC has good degradation ability for MG, and the degradation rate is affected by the adding amount of DFC, solution initial pH, temperature, and coexisting anions. Under the optimal conditions of DFC adding amount of 30 mg, initial pH=7, and temperature of 40 ℃, the degradation rate of MG can reach 96% within 10 min. Free radical trapping experiments show that superoxide radical () is the dominant active species, and hydroxyl radical (·OH) plays a synergistic role. Intermediate analysis reveals that MG mainly achieves deep degradation through demethylation, chromophore destruction, and aromatic ring breakage. This study can provide a technical reference for the application of natural mineral-based iron oxide composites in dye wastewater treatment.
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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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