“Two-in-one” dual-function luminescent MOF hydrogel for onsite ultra-sensitive detection and efficient enrichment of radioactive uranium in water

In consideration of the severe hazards of radioactive uranium pollution and the growing demand of uranium resources, the novel sensor/adsorbent composite was creatively developed to integrate the dual functions for on-site detection of uranium contamination and efficient recovery of uranium resource...

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Bibliographic Details
Published in:Journal of hazardous materials 2023-04, Vol.448, p.130864-130864, Article 130864
Main Authors: Cui, An-Qi, Wu, Xiao-Yi, Ye, Jun-Bin, Song, Gang, Chen, Di-Yun, Xu, Jie, Liu, Yu, Lai, Jia-Ping, Sun, Hui
Format: Article
Language:English
Subjects:
Fluorescence
Lanthanide
Metal-organic framework (MOF)
Sensor
Uranium
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Summary:In consideration of the severe hazards of radioactive uranium pollution and the growing demand of uranium resources, the novel sensor/adsorbent composite was creatively developed to integrate the dual functions for on-site detection of uranium contamination and efficient recovery of uranium resources. By hybridizing the luminescent 3D terbium (III) metal–organic framework (Tb–MOF) with sodium alginate (SA) gel using terbium (III) as cross-linker, the Tb-MOF/Tb-AG was fabricated with multi-luminescence centers and sufficient binding sites for uranium. Notably, the ultra-high sensitivity with detection limit as low as 1.2 ppt was achieved, which was 4 orders of magnitude lower than the uranium contamination standard in drinking water (USEPA) and even comparable to the sensitivity of the ICP-MS. Furthermore, the very wide quantification range (1.0 ×10−9-5.0 ×10−4 mol/L), remarkable adsorption capacity (549.0 mg/g) and outstanding anti-interference ability have been achieved without sophisticated sample preparation procedures. Applied in complex natural water samples from Uranium Tailings and the Pearl River, this method has shown good detection accuracy. The ultra high sensitivity and great adsorption capacity for uranium could be ascribed to the synergistic coordination, hydrogen bonding and ion exchange between uranium and Tb-MOF/Tb-AG. The mechanisms were explored by infrared spectroscopy, batch experiments, X-ray photoelectron studies and energy dispersive spectroscopic studies. In addition, the Tb-MOF/Tb-AG can be reused for uranium adsorption. [Display omitted] •Novel lanthanide MOF hydrogel composite was designed with multi-luminescence centers.•Dual functions for on-site visual sensing and efficient adsorption of uranium were achieved.•Detection limit of 1.2 ppt for uranium was reached, even comparable to ICP-MS.•Remarkable adsorption capacity of 549.0 mg/g and excellent anti-interference ability.•On-site detection with ultra high sensitivity and wide quantification range.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2023.130864