Journal
CHEMICAL ENGINEERING JOURNAL
Volume 450, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138044
Keywords
Uranium; ZnO; Up-conversion; Photoreduction; Doping
Categories
Funding
- NSFC [21976147, 21906154, 21902130]
- Sichuan Science and Technology Program [21zd3366, 18zx7149]
- Project of State Key Laboratory of Environment-friendly Energy Materials in SWUST [19zx7129]
- Research Fund of SWUST
- [2020JDJQ0060]
- [2020YFG0191]
- [20fksy19]
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Er-doped ZnO nanosheets enable ultrafast photocatalytic uranium extraction through up-conversion, achieving high extraction efficiency and capacity.
As an important strategic resource and environmental pollutant, uranium has high toxicity and economic value. Photocatalytic reduction of soluble hexavalent uranium (U(VI)) is a green and economic method to achieve uranium extraction, whereas the reported photocatalyst commonly requires a long period of > 1 h to reach a high extraction efficiency (> 90%). Herein, we reported the ultrafast photocatalytic uranium extraction by up -conversion Er doped ZnO nanosheets. In the initial U(VI) concentration of 200 mg/L, the Er doped ZnO with 4% doping level (Er-0.04-ZnO) nanosheets achieved 91.8% within 3 min, which was at least a magnitude shorter relative to ever-reported materials. The Er-0.04-ZnO nanosheets reached a high removal efficiency of 96.1% in 10 min, with a considerable U(VI) extraction capacity of 3036 mg/g. The mechanistic study showed that the Er doping induced the up-conversion properties and increases the carrier density, thus enhancing the light adsorption and accelerating the U(VI) extraction.
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