An ultra-low detection limit gold(III) probe based on rhodamine-covalent hydrogel sensor.

Abstract:

:A highly sensitive and selective optical chemosensor (Arg-Rhoen) for determination of Au3+ was prepared by covalent immobilization of rhodamine ethylenediamine on agarose gel. Spectrophotometric studies of complex formation, chemical structures and purity of the hydrogel sensor were carried out using TGA, NMR, TEM, and IR. The complexation study results indicated that this probe can selectively detect Au3+ via a metal ion chelation-induced ring-opening reaction, and then caused a remarkable colour change from colourless to pink and a strong fluorescence enhancement. Theoretical DFT calculation results suggested that the hydrogel sensor Arg-Rhoen formed stable complexes with Au3+ through a large number of cation-dipole interactions. Reusability has been established by repeatedly dipping and rinsing the hydrogel in aqueous Au3+ and EDTA in basic solutions. We believe that this approach may provide an easily measurable and inherently sensitive method for Au3+ detection in environmental and biological applications.

journal_name

Environ Technol

journal_title

Environmental technology

authors

Kaewtong C,Wanich S,Wanno B,Tuntulani T,Pulpoka B

doi

10.1080/09593330.2020.1850873

subject

Has Abstract

pub_date

2020-12-07 00:00:00

pages

1-9

eissn

0959-3330

issn

1479-487X

pub_type

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