光催化
铀
还原剂
材料科学
选择性
分解水
氧化还原
动力学
纳米颗粒
催化作用
光化学
纳米技术
化学工程
化学
无机化学
物理
有机化学
量子力学
冶金
工程类
作者
Xin Cao,Kaifu Yu,Yang Zhang,Nan Li,Peng Wang,Li Zhou,Xiang Gong,Hongbin Wang,Fan Yang,Wenkun Zhu,Rong He
标识
DOI:10.1021/acsami.2c17849
摘要
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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