A Composite Catalytic Oxidation-fluorescence Sensing System for 2,4-dichlorophenol Analysis based on Fe(III)PcTs-BuOOH-CdTe QDs

Abstract

The active oxygen species in the catalytic oxidation system of Fe(III)PcTs-t-BuOOH were identified, and the mechanism of the catalytic oxidation of phenolic substrates was proposed. Quinone imine molecules, the main products of catalytic oxidation reaction, can be adsorbed on the surface of CdTe QDs, resulting in their fluorescence quenching. A dual function of catalytic oxidation and fluorescence sensing was developed for the determination of dichlorophenol (DCP) based on the Fe(III)PcTs-BuOOH-CdTe QDs system. The linear detection range of DCP was 1×10⁻⁶–1.3×10⁻⁴ mol/L, and the detection limit 2.4×10⁻⁷ mol/L. This method was characterized by high selectivity, good repeatability and desirable stability, presenting promising potentials for analyzing DCP concentration in real water samples.

Keywords

dichlorophenol (DCP) / Fe(III)PcTs-BuOOH-CdTe QDs system / quinone imine / catalytic oxidation / fluorescence sensing