The effects of the formation of iron minerals at the interface of birnessite(MnO2)on the environmental behavior of antimony(Sb)were systematically studied in this paper. Many nanoparticles and abundant pore structure was found on the obtained Fe-Mn binary oxide(Fe-MnO2). HRTEM and XRD analysis indicated that the nanoparticles anchored on MnO2 was ferrihydrite. The iron minerals formed on MnO2 enhanced adsorption performance for Sb(III)and Sb(V). The adsorption capacities of Sb(III)and Sb(V)by Fe-MnO2 were 397.4 and 247.7mg/g, respectively, which was much higher than that of MnO2 for Sb(III)and Sb(V)immobilization(342.0 and 71.8mg/g). The chemical bond complexation was the dominant mechanism for Sb(III)and Sb(V)immobilization. The electrostatic adsorption played an important role in Sb(V)immobilization. The ferrihydrite made a significant contribution for reducing the mobility of Sb. MnO2 played the critical role in the transformation of Sb(III)to Sb(V). This study not only reveals the formation mechanism of Fe-Mn binary oxide, but also helps to further understand the migration and transformation behavior of Sb in the environment.
| 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 |