Issue 15, 2019

A highly selective colorimetric fluorescent probe for detection of Hg2+ and its application on test strips

Abstract

An efficient fluorescent probe Pyr-Rhy based on pyrazole was developed, which can detect Hg2+ in water. Its fluorescence properties were studied by UV-vis and fluorescence spectroscopy, and the study results indicated that this probe can selectively detect Hg2+via complexation reaction, and then cause a remarkable color change from colorless to pink and a strong fluorescence enhancement can be observed. Furthermore, this probe showed high sensitivity with the detection limit down to 2.07 × 10−8 M, and its stoichiometric ratio toward Hg2+ ions was 1 : 1. The sensing mechanism was investigated by Job's plot 1H NMR titrations, and FT-IR spectra analysis, which demonstrated a chelation-enhanced fluorescence (CHEF) mechanism. More importantly, obvious color changes of sensor Pyr-Rhy can be observed when it was impregnated on filter paper testing strips and immersed in Hg2+ solution (water as solution), indicating its potential application for trace Hg2+ detection in environmental samples.

Graphical abstract: A highly selective colorimetric fluorescent probe for detection of Hg2+ and its application on test strips

Article information

Article type
Paper
Submitted
30 jan 2019
Accepted
02 mar 2019
First published
13 mar 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 8529-8536

A highly selective colorimetric fluorescent probe for detection of Hg2+ and its application on test strips

G. Yang, X. Meng, S. Fang, H. Duan, L. Wang and Z. Wang, RSC Adv., 2019, 9, 8529 DOI: 10.1039/C9RA00797K

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