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Outline
Fe-modified/unmodified Carex meyeriana Kunth biochars were prepared at 300, 500, and 700℃. The degradation efficiencies of rhodamine B (RhB) in water by peracetic acid (PAA) were compared. The effects of reaction conditions (PAA concentration, Fe-KBC700 dosage, RhB concentration, pH, H2O2 concentration, co-existing anion and fulvic acid) on 700℃ iron-modified biochar (Fe-KBC700) were studied. The dominant active species, activation mechanism and degradation pathways of RhB were analyzed. High pyrolysis temperature and the introduction of Fe were beneficial to the improvement of biochars activation properties. Fe-KBC700/PAA system degraded 99.8% of RhB within 30min. Higher PAA concentration, Fe-KBC700dosage and lower RhB concentration were conducive to RhB degradation, while alkaline conditions and higher co-existing H2O2 concentration inhibit the reaction. Cl-, SO42-, and NO3- hardly affect the degradation of RhB, while HCO3- and fulvic acid could inhibit the reaction. The degradation of RhB was mainly due to the non-radical pathway. Singlet oxygen, electron transfer process and high-valent iron were detected in the reaction. The oxygen-containing functional groups and defects of Fe-KBC700 were the key reaction sites, and two degradation pathways of RhB were inferred. In addition, Fe-KBC700 could degrade 75.4% of RhB after 5 cycles. This study could provide a reference for the optimization of catalytic performance of biochars and the mechanism of activation of PAA by iron-modified biochar.
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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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