Search

In this study, a novel Euc functionalized zinc metal--organic framework (Eu@Zn-MOF) probe has been prepared by the post-synthetic modification method. Eu@Zn-MOF exhibited a strong blue fluorescence emission band of the Zn-MOF and a weak characteristic emission of Eu3+ under 390 nm excitation, which were innovatively used to construct a ratiometric fluorescent probe for tetracycline detection. Upon addition of tetracycline, the fluorescence of the Zn-MOF was quenched because of the inner filter effect between tetracycline and Eu@Zn-MOF, while the fluorescence of Eu3+ was enhanced owing to the ''antenna'' effect between tetracycline and Eu3+. Based on the ratio of fluorescence intensities, efficient detection of tetracycline was achieved. The results indicated that the ratiometric fluorescent probe has an excellent selectivity toward tetracycline over various interferents. It was found that there is a good linear relationship between the fluorescence intensity ratio (F618/F430) and the concentration of tetracycline ranging from 0.1 to 22.5 mM with a detection limit of 33 nM. Meanwhile, the color change of the solution from blue to light pink under an ultraviolet lamp can be observed by the naked eye. The assay was successfully used to detect tetracycline in tap water samples with a recovery of 97.1-100.6%. [ABSTRACT FROM AUTHOR]

Fe3O4@3-aminophenol-formaldehyde (Fe3O4@APF) core-shell resin polymer magnetic nanocomposites were synthesized using a straightforward surfactant-free methodology. The shell quickly formed within 5 min and could be easily size tunable in the range from 15 to 137 nm by changing the concentrations of 3-aminophenol and formaldehyde. The morphology, composition and magnetic properties of the resulting magnetic microspheres were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and thermogravimetric analysis measurements. The magnetic microspheres were uniform in morphology and can be converted into Fe3O4@carbon magnetic nanocomposites because of their excellent thermal stability. Moreover, Fe3O4@APF magnetic microspheres have excelling adsorption properties in the removal of methyl blue. [ABSTRACT FROM AUTHOR]

Luminol electrochemiluminescence is dramatically increased by about five hundred times by taking full advantage of both electrochemical reduction and electrochemical oxidation using simple linear sweep voltammetry, leading to sensitive detection. [ABSTRACT FROM AUTHOR]

Ozone unexpectedly dramatically suppresses the electrochemiluminescence (ECL) of Ru(phen)³2+/glyoxal at an ozone/glyoxal ratio of less than 0.5%. Moreover, a sensitive, simple and fast ECL method for ozone detection is developed, with a detection time within 1 min and a limit of detection of 20 nM. [ABSTRACT FROM AUTHOR]