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Luminescent magnetic nanoparticles encapsulated in MOFs for highly selective and sensitive detection of ClO-/SCN- and anti-counterfeiting

Abstract

It is well-known that ClO- and SCN- can cause adverse effects on the environment and organisms; therefore, development of new strategies for detecting ClO- and SCN-, especially in water, are highly desirable. Here, we present a luminous Eu (III) complex-functionalized Fe3O4 nanoparticles encapsulated into the zeolitic imidazolate framework materials (nano-ZIF-8) and successfully employ this nano-MOF as a fluorescence probe for selective and sensitive detection of ClO- and SCN-. The introduction of ClO- into nano-ZIF-8 solution induced a significant decrease in the characteristic fluorescence emission of Eu3+ at 613 nm. However, strong fluorescence emission was observed again when SCN- was successively injected into the prepared nano-ZIF-8-ClO-. Thus, such novel fluorescence system for simultaneous detection of free ClO- and SCN- was established. On the basis of the superior adsorption performance of nano-MOF materials, free residual ClO- and SCN- in water was rapidly, sensitively and selectively detected with a detection limit of 0.133 nM and 0.204 nM, respectively. Moreover, nano-ZIF-8 was successfully used for monitoring the concentration levels of ClO- and SCN- in the specimens of tap water and Yellow River water. Furthermore, the reversibility and regeneration of nano-ZIF-8 for sensing ClO- and SCN- provided many advantages to apply nano-ZIF-8 for solid-state sensing and anti-counterfeiting technique. As far as we know, this is the first time that nano-MOFs has been used as a selective fluorescence probe for ClO-/SCN- detection and anti-counterfeiting.

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Supplementary files

Publication details

The article was received on 21 Feb 2018, accepted on 13 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01487F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Luminescent magnetic nanoparticles encapsulated in MOFs for highly selective and sensitive detection of ClO-/SCN- and anti-counterfeiting

    C. Li, J. Hai, S. Li, B. Wang and Z. Yang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01487F

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