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Nanoscale Zeolitic Imidazole Framework-90: Selective, Sensitive and Dual-Excitation Ratiometric Fluorescent Detection of Hazardous Cr(VI) Anions in Aqueous Media

Abstract

Development of selective and sensitive sensing systems of Cr(VI) anions (CrO42-/Cr2O72-) have been a growing interest due to Cr(VI) anions are potent carcinogenic and mutagenic ions that have become serious potential threats to public health safety. Herein, 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 selective sensing Cr(VI) anions from Fe3+ cation, and also has lowest detection limits among reported fluorescent MOF-based probes for Cr(VI) anions: 1.41 M (0.16 ppm) for CrO42-; 1.78M (0.38 ppm) for Cr2O72-. The detailed sensing mechanism study uncovered that the excellent sensing performance of NZIF-90 for Cr(VI) anions is basd 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 Föster resonance energy transfer (FRET)-based dual-excitation ratiometric fluorescent detection of Cr(VI) anions was also realized by Rhodamine B (RhB) encapsulated NZIF-90 (RhB@NZIF-90).

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Publication details

The article was received on 26 Apr 2018, accepted on 06 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8NJ02047G
Citation: New J. Chem., 2018, Accepted Manuscript
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    Nanoscale Zeolitic Imidazole Framework-90: Selective, Sensitive and Dual-Excitation Ratiometric Fluorescent Detection of Hazardous Cr(VI) Anions in Aqueous Media

    H. Jin, W. Zhong, L. Yuan and X. Zhang, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02047G

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