Ultrasensitive Fluorescence Detection of Peroxymonosulfate Based on a Sulfate Radical-Mediated Aromatic Hydroxylation

Recently, peroxymonosulfate (PMS)-based advanced oxidation processes have exhibited broad application prospects in the environment field. Accordingly, a simple, rapid, and ultrasensitive method is highly desired for the specific recognition and accurate quantification of PMS in various aqueous solut...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2018-12, Vol.90 (24), p.14439-14446
Main Authors: Huang, Gui-Xiang, Si, Jin-Yan, Qian, Chen, Wang, Wei-Kang, Mei, Shu-Chuan, Wang, Chu-Ya, Yu, Han-Qing
Format: Article
Language:English
Subjects:
Aqueous solutions
Benzoic acid
Carbon dioxide
Chemistry
Cobalt
Fluorescence
Hydrogen peroxide
Hydroxylation
Organic chemistry
Oxidation
Peroxides
Reaction mechanisms
Recognition
Salicylic acid
Spectrometry
Sulfates
Water analysis
Water sampling
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Summary:Recently, peroxymonosulfate (PMS)-based advanced oxidation processes have exhibited broad application prospects in the environment field. Accordingly, a simple, rapid, and ultrasensitive method is highly desired for the specific recognition and accurate quantification of PMS in various aqueous solutions. In this work, SO4 •–-induced aromatic hydroxylation was explored, and based on that, for the first time, a novel fluorescence method was developed for the PMS determination using Co2+ as a PMS activator and benzoic acid (BA) as a chemical probe. Through a suite of spectral, chromatographic, and mass spectrometric analyses, SO4 •– was proven to be the dominant radical species, and salicylic acid was identified as the fluorescent molecule. As a result, a whole radical chain reaction mechanism for the generation of salicylic acid in the BA/PMS/Co2+ system was proposed. This fluorescence method possessed a rapid reaction equilibrium (
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.8b04047