A non-polluting method for rapidly purifying uranium-containing wastewater and efficiently recovering uranium through electrochemical mineralization and oxidative roasting
| Autor: | Shao-yan Lv, Lei Bi, Yi-long Hua, Tao Cai, Xiaoyan Wu, Qi Fang, Xiaowen Zhang, Mi Li |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Water Pollutants
Radioactive Environmental Engineering Iron Health Toxicology and Mutagenesis 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology Wastewater 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Environmental Chemistry Waste Management and Disposal 0105 earth and related environmental sciences Magnetite Roasting Pollutant 021110 strategic defence & security studies Radioactive waste Mineralization (soil science) Uranium Pollution Environmentally friendly Oxidative Stress chemistry Environmental chemistry |
| Zdroj: | Journal of Hazardous Materials. 416:125885 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2021.125885 |
| Popis: | Iron-based materials have been widely used for treating uranium-containing wastewater. However, the iron-uranium solids originating by treating radioactive water through pollutant transfer methods has become a new uncontrolled source of persistent radioactive pollution. The safe disposal of such hazardous waste is not yet well-resolved. The electrochemical mineralization method was developed to rapidly purify uranium-containing wastewater through lattice doping in magnetite and recover uranium without generating any pollutants. An unexpected isolation of U3O8 from uranium-doped magnetite was discovered through in-situ XRD with a temperature variation from 300 °C to 700 °C. Through HRTEM and DFT calculation, it was confirmed that the destruction of the inverse spinel crystal structure during the gradual transformation of magnetite into γ-Fe2O3 and α-Fe2O3 promoted the migration, aggregation, and isolation of uranium atoms. Uniquely generated U3O8 and Fe2O3 were easily separated and over 80% uranium and 99.5% iron could be recovered. These results demonstrate a new strategy for uranium utilization and the environmentally friendly treatment of uranium-containing wastewater. |
| Databáze: | OpenAIRE |
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