光催化
吸附
氢
化学
辐照
铀
钒
原性土壤
二氧化钛
无机化学
材料科学
光化学
纳米技术
化学工程
催化作用
冶金
物理化学
有机化学
核物理学
土壤水分
土壤科学
工程类
物理
环境科学
作者
Huanhuan Liu,Jia Lei,Jiali Chen,Ye Li,Changyao Gong,Shangjie Yang,Yamin Zheng,Ning Lü,Yan Liu,Wenkun Zhu,Rong He
出处
期刊:Nano Research
[Springer Nature]
日期:2021-11-16
卷期号:15 (4): 2943-2951
被引量:19
标识
DOI:10.1007/s12274-021-3916-8
摘要
Photocatalytic reduction of U(VI) represents a novel and effective manner for the removal of U(VI) pollutant from radioactive wastewater. Herein, we successfully incorporated hydrogen into VO2 nanosheets, which strengthened the interaction between VO2 and U(VI), thereby achieving a highly active and stable photocatalyst for U(VI) reduction. With the increase of H content in hydric VO2 (HX-VO2) nanosheets, the bandgap shrank from 2.29 to 1.66 eV, whereas the position of conduction bands remained more negative than the reduction potential of U(VI)/U(IV) (0.41 V vs. NHE). When irradiated by simulated sunlight, the U(VI) removal efficiency over H0.613-VO2 nanosheets reached up to 95.4% within 90 min, which largely outperformed 28.3% of pristine VO2 nanosheets. The mechanistic study demonstrated that the hydroxylated surface gave rise to the balanced O confinement sites in VO2 (011), leading to the stabilized adsorption configuration and increased binding strength of UO22+ on HX−-VO2 nanosheets.
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