Nanoscale zeolitic imidazole framework-90: selective, sensitive and dual-excitation ratiometric fluorescent detection of hazardous Cr( vi ) anions in aqueous media

The development of selective and sensitive sensing systems for Cr( vi ) anions (CrO 4 2− /Cr 2 O 7 2− ) has been a growing interest because Cr( vi ) anions are potent carcinogenic and mutagenic ions that have become serious potential threats to public health and safety. Herein, the selective and hig...

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Bibliographic Details
Published in:New journal of chemistry 2018, Vol.42 (15), p.12549-12556
Main Authors: Jin, Hong-Guang, Zong, Weibang, Yuan, Lin, Zhang, Xiao-Bing
Format: Article
Language:English
Subjects:
Anions
Carcinogens
Detection
Energy absorption
Excitation
Fluorescence
Imidazole
Ions
Metal-organic frameworks
Public health
Rhodamine
Synergistic effect
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Summary:The development of selective and sensitive sensing systems for Cr( vi ) anions (CrO 4 2− /Cr 2 O 7 2− ) has been a growing interest because Cr( vi ) anions are potent carcinogenic and mutagenic ions that have become serious potential threats to public health and safety. Herein, the selective and highly sensitive detection of toxic Cr( vi ) anions in aqueous solution has been achieved by virtue of nanoscale zeolitic imidazole framework-90 (NZIF-90). NZIF-90 is the first individual MOF-based material which can selectively sense Cr( vi ) anions from Fe 3+ cations, and it also has the lowest detection limits among the reported fluorescent MOF-based probes for Cr( vi ) anions: 1.41 μM (0.16 ppm) for CrO 4 2− and 1.78 μM (0.38 ppm) for Cr 2 O 7 2− . The detailed sensing mechanism study uncovered that the excellent sensing performance of NZIF-90 for Cr( vi ) anions is based on the synergistic effect of the competitive energy absorption process and the electrostatic interaction between NZIF-90 and Cr( vi ) anions. Moreover, as for a further potential application of this probe, the Förster resonance energy transfer (FRET)-based dual-excitation ratiometric fluorescent detection of Cr( vi ) anions was also realized by Rhodamine B (RhB) encapsulated into NZIF-90 (RhB@NZIF-90).
ISSN:1144-0546
1369-9261
DOI:10.1039/C8NJ02047G