期刊
ACS APPLIED MATERIALS & INTERFACES
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c17849
关键词
water oxidation cocatalysts; U(VI) photoreduction; U(VI) confinement sites; UiO-66; carrier separation efficiency
资金
- NSFC [21976147, 21906154, 21902130]
- Sichuan Science and Technology Program [2022JDRC0074, 2020JDJQ0060, 2020YFG0191]
- Project of State Key Laboratory of Environment-friendly Energy Materials in SWUST [20fksy19, 21zd3366]
- Research Fund of SWUST [18zx7149, 19zx7129]
This study successfully developed a UiO-66-based photocatalyst, MnOx/NH2-UiO-66, which achieves efficient U(VI) removal without sacrificial agents. The amino groups serve as U(VI) confinement sites, while MnOx nanoparticles separate the photogenerated electron-hole pairs and provide water oxidation sites, jointly promoting the U(VI) photoreduction performance of MnOx/NH2-UiO-66.
Reduction of hexavalent uranium [U(VI)] by the photocatalytic method opens up a novel way to promote the selectivity, kinetics, and capacity during uranium removal, where organic molecules act as the sacrificial agents. However, the addition of sacrificial agents can cause a secondary environmental pollution and increase the cost. Here, a UiO-66-based photocatalyst (denoted as MnOx/NH2-UiO-66) simultaneously with efficient U(VI) confinement sites and water oxidation sites was successfully developed, achieving excellent U(VI) removal without sacrificial agents. In MnOx/NH2- UiO-66, the amino groups served as efficient U(VI) confinement sites and further decreased the U(VI) reduction potential. Besides, MnOx nanoparticles separated the photogenerated electron-hole pairs and provided water oxidation sites. The U(VI) confinement sites and water oxidation sites jointly promoted the U(VI) photoreduction performance of MnOx/NH2-UiO-66, resulting in the removal ratio of MnOx/NH2-UiO-66 for U(VI) achieving 97.8% in 2 h without hole sacrifice agents. This work not only provides an effective UiO-66-based photocatalyst but also offers a strategy for effective U(VI) photoreduction.
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