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. 2020 Jun 29;10(42):24764-24771.
doi: 10.1039/d0ra02581j.

A dual emission metal-organic framework for rapid ratiometric fluorescence detection of CO3 2- in seawater

Yu Wei  1 , Yan Xia  1   2   3   4
Affiliations

A dual emission metal-organic framework for rapid ratiometric fluorescence detection of CO3 2- in seawater

Yu Wei et al. RSC Adv. .

Abstract

A dual emission metal-organic framework (IRMOF-10-Eu) was prepared and used as a ratiometric fluorescent sensor for CO3 2- detection. IRMOF-10-Eu had good stability and excellent luminescence in aqueous solution. IRMOF-10-Eu showed dual fluorescence emission from the ligand and Eu3+ with single excitation. Upon treatment with CO3 2-, the fluorescence ratio (I 624/I 358) of the probe displayed significant change. The relative fluorescence intensity ratio (I 624/I 358) and CO3 2- concentration had a linear relationship in 50-300 μM range with a low detection limit of 9.58 μM. And the luminescence probe of CO3 2- showed a fast detection time. The possible mechanism was investigated. CO3 2- changed the structure of IRMOF-10-Eu and interrupted the energy transfer process. Thus, the fluorescence emission intensity of the ligand was increased and Eu3+ was decreased with the addition of CO3 2-. IRMOF-10-Eu was used to detect CO3 2- in seawater, which showed good prospect in practical application. Subsequently, a highly selective and sensitive probe, IRMOF-10-Eu, may pave an efficient way for CO3 2- detection in seawater.

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Conflict of interest statement

The authors have declared no conflict of interest.

Figures

Fig. 1
Fig. 1. (A) PXRD patterns of IRMOF-10 and IRMOF-10-Eu; SEM image of IRMOF-10 (B) and IRMOF-10-Eu (C); (D) TGA curve of IRMOF-10 and IRMOF-10-Eu.
Fig. 2
Fig. 2. The excitation and emission spectrum of IRMOF-10-Eu. Inset shows photograph of the mixture solution illustrate color under daylight (left) and ultraviolet light (right).
Fig. 3
Fig. 3. Day-to-day fluorescence stability of IRMOF-10-Eu (0.05 mg mL−1) under excitation at 278 nm.
Fig. 4
Fig. 4. (A) The emission spectra of IRMOF-10-Eu added in CO32− solution with different concentration under excitation at 278 nm. (B) Plot of the relative luminescence intensity (I624/I358) versus the concentration of CO32−.
Fig. 5
Fig. 5. Luminescence ratio of I624/I358 from the responses of IRMOF-10-Eu in the presence of 300 μM carbonate ions and 500 μM interference ions.
Scheme 1
Scheme 1. A plausible mechanism for detection of CO32− using IRMOF-10-Eu.
See this image and copyright information in PMC

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