Full
Outline
In response to the demand for Sb(Ⅴ) pollution remediation in groundwater of mining areas, and to overcome the low adsorption capacity of conventional layered double hydroxides (LDHs), a urea-assisted hydrothermal method was adopted to modify MgAl-LDHs via Ni/Co co-doping. The results show that a nanosheet material with a Ni/Co molar ratio of 2∶1 (denoted as N2C1) was prepared and applied to adsorb Sb(Ⅴ). At room temperature, N2C1 exhibited a maximum theoretical Sb(Ⅴ) adsorption capacity of 60.04 mg/g, while the actual adsorption capacity was significantly enhanced from 11.6 mg/g for pristine LDHs to 41.7 mg/g. The adsorption behavior conformed to the Freundlich isotherm model and the pseudo-second-order kinetic model, with rapid uptake occurring within the first 20 min and equilibrium being reached at approximately 120 min. Column tests and coexisting ion interference experiments demonstrate that the material possesses favorable dynamic removal performance and anti-interference capability in complex groundwater environments. Environmental compatibility assessment indicates that the leaching concentrations of Ni, Co, and Al remained below the detection limits within the pH range of 4-12, with only a minor release of Mg observed under acidic conditions, suggesting a low environmental risk. Combined Zeta potential, FT-IR, and XPS analyses confirm that the enhanced Sb(Ⅴ) removal performance was attributed to the synergistic effects of strengthened electrostatic attraction, enhanced surface complexation, and interlayer anion exchange. This study provides a theoretical basis and material support for the application of Ni/Co co-doped LDHs in the in situ remediation of antimony-contaminated groundwater in mining areas.
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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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