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Fluorescent nanoprobe based on cellulose nanocrystals with porphyrin pendants for selectively quantitative trace detection of Hg2+

Abstract

Well dispersed chemosensor based on cellulose nanocrystals (CNCs) with prophyrin pendants (CNC-SA-COOC6TPP) was facilely synthesized by the combination of carboxylation, extended esterification and dicyclohexylcarbodiimide (DCC) reaction. The CNC-SA-COOC6TPP nanomaterials promoted the solubility of prophyrin groups in water and the nanomaterials could be easily separated from water by filtering. The structure of CNC-SA-COOC6TPP nanomaterials could be vertified by FT-IR, 1H NMR and XPS characterization. The TEM images showed that CNC-SA-COOC6TPP nanomaterials presented needle-like morphologies. The unique properties of high sensitivity and selectivity for Hg2+ of prophyrin-modified CNCs were investigated separately via fluorecence emmission spectroscopy under characteristic excitation wavelength of porphyrin moieties. Further investigation revealed that CNC-SA-COOC6TPP nanomaterials (0.01 wt % in H2O) could specially detect Hg2+ with a detection limit for Hg2+ of ca. 5.0×10-8 mol L-1 (50 nM). In addition, Hg2+ will be specially detected in the interference of other metal ions, which was attributed to the specific formation of Hg2+-porphyrin complex with an interaction stoichiometry of one Hg2+ per porphyrin moiety. The concentration of all other metal ions could be qualitatively detected based on the relationship between fluorescence intensity and concentration. As a result, the good dispersion of cellulose nanocrystals and the high selectively and sensitivity of prophyrin pendants resulted in the high efficient detection for Hg2+ in water, which will make CNC-SA-COOC6TPP a promising fluorescence chemosensor.

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Supplementary files

Publication details

The article was received on 16 Apr 2017, accepted on 03 Aug 2017 and first published on 03 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ01263B
Citation: New J. Chem., 2017, Accepted Manuscript
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    Fluorescent nanoprobe based on cellulose nanocrystals with porphyrin pendants for selectively quantitative trace detection of Hg2+

    J. Chen, Z. Zhou, Z. Chen, W. Yuan and M. Li, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ01263B

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