A dual-functional fluorescent nanoprobe based on UIO-66-NH2 for the continuous detection of o-phenylenediamine and Ag+

Abstract

Environmental pollution, especially caused by organic pollutants and heavy metal ions, seriously threaten the ecological environment and human health. In this work, UIO-66-NH₂, with fluorescence emission at 426 nm, was synthesized. It was found that with the increase in the concentration of o-phenylenediamine (OPD) in UIO-66-NH₂ solution, the fluorescence at 426 nm was enhanced, which could be used to quantify the OPD content. In addition, with the increased concentration of Ag⁺, fluorescence of the UIO-66-NH₂/OPD system decreased at 426 nm, while a new fluorescence peak appeared at 556 nm. Based on the changes in the fluorescence property of the UIO-66-NH₂/OPD system before and after the additon of Ag⁺, a quantitative analysis of Ag⁺ concentration (0.31–225 μM) by the ratio of F426/F556 was realized. This strategy used UIO-66-NH₂ as the probe to realize the continuous determination of organic pollutants and heavy metal ions, providing a new idea for the detection of pollutants.