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Issue 18, 2018
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Luminescent magnetic nanoparticles encapsulated in MOFs for highly selective and sensitive detection of ClO/SCN and anti-counterfeiting

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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 luminous Eu(III) complex-functionalized Fe3O4 nanoparticles encapsulated into 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 again observed when SCN was successively injected into the prepared nano-ZIF-8-ClO. Thus, a 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 specimens of tap water and Yellow River water. Furthermore, the reversibility and regeneration of nano-ZIF-8 in sensing ClO and SCN is advantageous for applications of nano-ZIF-8 in solid-state sensing and anti-counterfeiting. As far as we know, this is the first time that nano-MOFs have been used as a selective fluorescence probe for ClO/SCN detection and anti-counterfeiting.

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

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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, 2018,10, 8667-8676
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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, 10, 8667
    DOI: 10.1039/C8NR01487F

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