铀酰
表面改性
铀
磷酸
光催化
萃取(化学)
介孔材料
材料科学
兴奋剂
化学工程
化学
无机化学
色谱法
催化作用
物理化学
有机化学
光电子学
冶金
工程类
作者
Mingzhe Li,Ruixiang Wang,Tong Liu,Qiang Chen,Nan Li,Li Zhou,Kaifu Yu,Huanhuan Liu,Xiang Gong,Rong He,Fawad Ahmad,Fan Yang,Wenkun Zhu,Tao Chen
标识
DOI:10.1016/j.seppur.2023.123121
摘要
Photo-assisted uranium extraction is recognized as a promising U-extraction method by turning soluble hexavalent uranium (U(VI)) into insoluble tetravalent uranium (U(IV)). However, efficient charge separation and abundant uranium confinement sites are two key factors for efficient uranium extraction. Herein, a facile and universal parallel strategy is reported to fabricate confinement-site-rich photocatalysts with ultrafast carrier separation by energy band-tailored coupled surface functional modification for photo-assisted extraction of uranium. As a proof-of-concept demonstration, Mn-doped mesoporous TiO2 microspheres with phosphoric acid modification (Mn-TiO2@PO4) are successfully synthesized, which enables accelerated carrier separation efficiency and enhances the U(VI) selectivity. By virtue of the theoretical simulation, in conjunction with other spectral analyses, we demonstrate that Mn doping efficiently modifies the band structure with improved electron-hole separation, and surface phosphoric acid modification can enhance the affinity for uranyl ions. Accordingly, the removal rate of Mn-TiO2@PO4 for U(VI) is up to 94%, which was 6.6 times as powerful as the pristine TiO2 microspheres. This study offers a valuable paradigm for the rational design of advanced photocatalysts with band-tailored coupled and surface functional modification for photo-assisted extraction of uranium.
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