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A composite of cubic spinel MnFe2O4 and carbon nanotubes (CNTs) was synthesized, denoted MnFe2O4/CNTs. This study evaluates the efficacy of MnFe2O4/CNT for electrocatalytic degradation of phenol, investigating the mechanism of electrocatalytic oxygen reduction to generate H2O2 and its subsequent activation into ·OH. The aim is to identify a highly efficient and stable cathode material suitable for electrocatalytic degradation of organic pollutants. Results demonstrate that under optimized conditions (MnFe2O4:CNT mass ratio = 19:2, applied voltage = -0.9V, pH = 3, catalyst loading = 0.44mg/cm2, O2 flow rate = 0.5L/min), MnFe2O4/CNTs achieved a remarkable phenol degradation efficiency of 99.9% within 30minutes and a total organic carbon (TOC) removal rate of 72.4% after 90minutes. Notably, the composite maintained 84.5% degradation efficiency of phenol after five consecutive cycles. The incorporation of CNTs not only improve electron transfer efficiency within the system, but leads to electron transfer between MnFe2O4 and CNTs induces an increase in the relative concentration of non-lattice oxygen species within MnFe2O4. Under the above dual effects, MnFe2O4/CNTs boost the capability to electrocatalytically reduce O2 to H2O2 and subsequently activate it in situ to generate ·OH, surpassing the performance of pristine MnFe2O4. The activation of H2O2 is mainly accomplished through a combined process of homogeneous activation involving Mn2+ and Fe2+ and heterogeneous activation excited by active sites such as non-lattice oxygen in MnFe2O4/CNT. The ·OH generated by the activation achieves a relatively thorough oxidation and decomposition of phenol.
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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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