Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 416, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125885
Keywords
Electrochemical mineralization; Incorporation; Transformation; Uranium recovery
Categories
Funding
- National Natural Science Foundation of China [51874180]
- Science and Technology Planning Project of Hunan Province [2019RS2042]
- Natural science foundation of Hunan Province [2018JJ3437]
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Iron-based materials are commonly used for treating uranium-containing wastewater, but the iron-uranium solids produced from this process can lead to persistent radioactive pollution. A new electrochemical mineralization method has been developed to recover uranium without generating pollutants, allowing for the effective separation and recovery of uranium and iron. This research provides a new strategy for uranium utilization and environmentally friendly treatment of uranium-containing wastewater.
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 degrees C to 700 degrees 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 gamma-Fe2O3 and alpha-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.
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