Highly-efficient and easy separation of γ-Fe2O3 selectively adsorbs U(â
¥) in waters.
Environ Res
; 210: 112917, 2022 07.
Article
em En
| MEDLINE
| ID: mdl-35151660
ABSTRACT
The migration and transformation of uranyl [U (â
¥)] ions in the environment are quite dependent on the geological condition in particular with the site enriched in Fe. In this study, the interfacial interaction of U (â
¥) ions with maghemite (γ-Fe2O3) particles was studied and the interaction mechanism was explored as well. Batch experiments confirm that γ-Fe2O3 can effectively remove U (â
¥) from an aqueous solution within a relatively short reaction time (R% > 92.01% within 3 min) and has a considerable capacity for U (â
¥) uptake (qt 87.35 mg/g). γ-Fe2O3 displays an excellent selectivity for U (â
¥) elimination. Results on the effects of natural organic matter such as humic acid (HA) indicated that HA could promote the interfacial interaction between γ-Fe2O3 and U (â
¥) under acidic conditions. Compared with other radionuclides (e.g., Sr(â
¡) and Cs(â
)), U (â
¥) was more effectively removed by γ-Fe2O3. The U (â
¥) removal by γ-Fe2O3 is primarily due to electrostatic interactions and precipitation that result in the long-term retardation of uranium. γ-Fe2O3 not only can fast and selectively adsorb U (â
¥) but also can be magnetically recycled, demonstrating that γ-Fe2O3 is a cost-effective and promising material for the clean-up of uranyl ions from radioactive wastewater.
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Base de dados:
MEDLINE
Assunto principal:
Poluentes Químicos da Água
/
Urânio
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article