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Outline
In the geological disposal of high-level radioactive waste, the mineral composition of surrounding rock and buffer materials is complex. Therefore, research is conducted from the perspective of rock composition to simplify research process of nuclide migration in geological media. The adsorption behavior of common minerals such as feldspar, illite and kaolinite on Se(Ⅳ) in granite, clay rock and bentonite was studied through batch experiments. The results show that under different conditions such as contact time, solution pH, ionic strength, initial mass concentration of Se(Ⅳ), solid mass to liquid volume ratio and temperature, the variation laws of the adsorption rates of Se(Ⅳ) by the three minerals are consistent, while the adsorption capacity of illite for Se(Ⅳ) is slightly higher than that of the other two minerals. The adsorption processes of Se(Ⅳ) by the three minerals all follow the pseudo-second-order kinetic model, which conforms to the Freundlich isotherm model, and the adsorption process is a spontaneous endothermic reaction. It is found through SEM, XRD and FT-IR characterization that there are no obvious changes in the three minerals before and after the adsorption of Se(Ⅳ).
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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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