Issue 13, 2019

A fluorescent probe for sequential sensing of MnO4 and Cr2O72− ions in aqueous medium based on a UCNS/TMB nanosystem

Abstract

This paper reports the successful design of an UC fluorescence nanosystem for distinguishable and sequential detection of MnO4 and Cr2O72− based on the inner filter effect (IFE) between Gd2O3:Yb,Er upconversion nanospheres (UCNS) and 3,3′,5,5′-tetramethylbenzidine (TMB). The detection of MnO4 was realized by a stoichiometric oxidation reaction between TMB and Mn(VII), which resulted in quenching of the upconversion luminescence (UCL) by the blue product through IFE. The assay of Cr2O72−, in contrast, was based on the formation of complexes and the consumption of the oxidation product of the previous reaction. The sensing of MnO4 did not interfere with that of Cr2O72− when Pb2+ was added as a masking agent. This provides a new strategy for sensitive and selective detection of MnO4 and Cr2O72−. The detection of MnO4 showed not only a low LOD of 0.243 μM but also high selectivity over other possible interfering ions. The sensitivity assay of MnO4 can be performed in the linear range of 1.85 to 69 μM. An excellent linear relationship was also found in the sensing of Cr2O72−, with a linear range of 18.3 to 250 μM and a LOD of 2.95 μM. The selectivity towards Cr2O72− was also proved to be good. Based on these properties, the UCNS–TMB nanoplatform is a potential chemosensor for both MnO4 and Cr2O72− ions in practical assays for waste water.

Graphical abstract: A fluorescent probe for sequential sensing of MnO4− and Cr2O72− ions in aqueous medium based on a UCNS/TMB nanosystem

Supplementary files

Article information

Article type
Paper
Submitted
25 Jan 2019
Accepted
03 Mar 2019
First published
05 Mar 2019

Dalton Trans., 2019,48, 4168-4175

A fluorescent probe for sequential sensing of MnO4 and Cr2O72− ions in aqueous medium based on a UCNS/TMB nanosystem

H. Liu, J. Rong, G. Shen, Y. Song, W. Gu and X. Liu, Dalton Trans., 2019, 48, 4168 DOI: 10.1039/C9DT00360F

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