Journal
MICROCHEMICAL JOURNAL
Volume 149, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.microc.2019.103967
Keywords
Metal-organic frameworks; UiO-66(Ce); Atomic fluorescence spectrometry; Colorimetric sensing; Selenium; Mercury
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Funding
- Department of Science and Technology of Sichuan Province, China [2016KJT0002-2015GZ0071]
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The cerium (Ce)-based UiO-66 metal-organic frameworks were employed for the first time as an effective catalyst for both oxidation and reduction. On one hand, selenium (Se)(VI) was efficiently photo-reduced to volatile species derived from the low lying of Ce 4f orbital and efficient generation of photo-electrons through the frameworks of UiO-66(Ce); on the other hand, the chromogenic substrate, 3, 3', 5, 5'-tetramethylbenzydine (TMB), was oxidized based on the oxidase-like behavior of UiO-66(Ce) derived from the Ce4+/Ce3+ spontaneous redox couple. The photo-reduced Se(VI) was determined by atomic fluorescence spectrometry, with a linear range of 5.0-200.0 mu g/L-1, correlation coefficient of 0.998, and detection limit of 1.5 ng/mL(-1) obtained. The colorimetric sensing of mercury (Hg)(II) was accomplished based on the inhibition of TMB oxidation via Hg (II)-TMB interaction, with two linear ranges of 0.1-2.0 mu M and 2.25-4.1 mu M obtained, and a correlation coefficient of 0.993 and 0.995 obtained, respectively. The catalytic activity of UiO-66(Ce) was demonstrated to be satisfactory for both oxidation and reduction, which further explored the application of UiO-66(Ce) in the field of catalysis.
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