1. Ultrasensitive Fluorescence Detection of Peroxymonosulfate Based on a Sulfate Radical-Mediated Aromatic Hydroxylation
- Author
-
Chen Qian, Jin-Yan Si, Han-Qing Yu, Wei-Kang Wang, Gui-Xiang Huang, Shu-Chuan Mei, and Chu-Ya Wang
- Subjects
Detection limit ,Aqueous solution ,Chemistry ,010501 environmental sciences ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Fluorescence ,0104 chemical sciences ,Analytical Chemistry ,chemistry.chemical_compound ,Molecule ,Chemical equilibrium ,Chain reaction ,Salicylic acid ,0105 earth and related environmental sciences ,Benzoic acid - Abstract
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 (
- Published
- 2018
- Full Text
- View/download PDF