Rational designing an azo colorimetric sensor with high selectivity and sensitivity for uranium environmental monitoring.
In: Analytica Chimica Acta, Jg. 1140 (2020-12-15), S. 153-167
Online
academicJournal
Zugriff:
Uranium, a double-edged sword with high-efficiency energy and radioactive toxicity, attracts people to enjoy the advantages by generating power, but at the same time brings potential harm by nuclide migration. Therefore, it is necessary to develop a highly-efficient sensor to monitor uranyl ions in the field. However, the designed processes of the reported sensors are random, time-consuming and difficulty. It is urgent to find a new strategy to rationally, quickly and effectively screen out the required molecule for efficient uranium detection. Herein, with the guidance from the rational design method, the parameter, E gap , was applied to judge the chromatic aberration between the designed PADAP derivate and its uranyl complex. And the optimized structure sensor, 2-((3-bromo-5-(9,9-dioctyl-7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-fluoren-2-yl)-2-pyridylazo)-5-(diethylamino)phenol (abbr. W1H), was screened and successfully synthesized. W1H exhibited significant color change (red to blue) after binding uranyl ions, and its detection limit for uranium was as low as nanomolar. More meaningfully, the coordination mechanism of W1H toward uranium was clarified by theoretical calculation of the electron cloud density distribution, E bind , and 1H NMR, IR and MS for the first time. With the more excellent uranyl sensitivity, selectivity, and recyclability, W1H and its colorimetric test strip have been applied to the detection of low-concentration uranium in environmental samples around the uranium tailings, providing a useful on-site method to monitor trace uranium in actual samples. Image 1 • A high selective and sensitive uranyl sensor named W1H was screened and synthesized with the help of rational design strategy. • The W1H detection limit by UV spectrophotometry was as low as nanomolar level, which was superior to the most reported colorimetric/UV sensors. • The binding mode of uranyl-W1H were identified by DFT calculation of the electron cloud density distribution, 1H NMR, IR and MS for the first time. • Stability constants of interfering metal ion toward W1H shows the reason why W1H can specifically recognize uranium than the other metal ions. • W1H and its colorimetric test strip has been applied to detect uranium in real sample, providing a useful method to detect contaminants in environment. [ABSTRACT FROM AUTHOR]
Titel: |
Rational designing an azo colorimetric sensor with high selectivity and sensitivity for uranium environmental monitoring.
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Autor/in / Beteiligte Person: | Wu, Xumeng ; Yin, Qiang ; Huang, Qiuxiang ; Mao, Yu ; Hu, Qinghua ; Wang, Hongqing |
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Zeitschrift: | Analytica Chimica Acta, Jg. 1140 (2020-12-15), S. 153-167 |
Veröffentlichung: | 2020 |
Medientyp: | academicJournal |
ISSN: | 0003-2670 (print) |
DOI: | 10.1016/j.aca.2020.10.005 |
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