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SiO2@nZVI@Fe3O4 composites were successfully synthesized by liquid-phase reduction and stőber hydrolysis. The microstructures and physical phase compositions of SiO2@nZVI@Fe3O4 were analyzed by SEM-EDS, TEM, XRD, FTIR, VSM, and XPS. The degradation performance of azo dyes was investigated by using SiO2@nZVI@Fe3O4 as a non-homogeneous catalyst combined with H2O2to construct a Fenton-like system. The results showed that the SiO2 coating improved the dispersion and oxidation resistance of nZVI@Fe3O4, and it was able to enhance the generation of Fe2+ and HO· in the Fenton-like reaction system. Under the conditions of 25℃, pH 3, H2O2 concentration of 15mmol/L, and material dosage of 0.6g/L, the removal efficiency of Congo red, Orange II and Acid Black 210 reached 99.68 %、98.14 % and 99.35 %. The composite material could still remove more than 79% of the three pollutants after recycling for three times, which has good stable catalytic performance. The removal of azo dyes by SiO2@nZVI@Fe3O4 combined with Fenton-like system was mainly through the reduction of nZVI and the oxidation of HO·, as demonstrated by reactive oxygen species quenching experiment and UV-visible spectral analysis.
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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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