The magnetic porous magnesium oxide(m-MgO) was prepared with nano-ferric oxide (Fe3O4) as the core and MgCl2 as the magnesium source, and was used for adsorption of U(Ⅵ) in aqueous solution. The physicochemical properties of MgO and m-MgO were characterized by FT-IR, XRD, VSM and Zeta potential. The effects of solution pH, temperature, and oscillation time on the adsorption of U(Ⅵ) by MgO and m-MgO were investigated. The results show that the optimal conditions for uranium adsorption by MgO and m-MgO are pH=3.5, adsorbent dosage of 10 mg, and oscillation time of 720 min. The adsorption process conforms to the pseudo-second-order kinetic model and the Sips isotherm adsorption model, with a theoretical adsorption capacity of 454.16 mg/g, and the increase of temperature is conducive to the spontaneous adsorption. Therefore, m-MgO is expected to be used to separate and recover uranium from radioactive wastewater.
| 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 |