Pyridine Schiff Base Functionalized Mesoporous Channels as Fluorescent Detection of Silver Ions in Aqueous Medium

Abstract

A novel fluorescent probe based on functional mesoporous material (denoted as SBA-KH-2py) with high sensitivity and selectivity of detecting silver ions (Ag + ) was designed and prepared by immobilizing (4-nitro-2-((pyridin-2-ylmethylene) amino) aniline (denoted as 2py-Schiff base) within the channels of mesoporous material. The 2py-Schiff base was successively loaded within the framework of mesoporous material by the organic silane coupling agent, and the ordered channels were still retained. With the increasing loading amounts of Schiff base, the fluorescence intensities of functional materials also were enhanced in the fluorescent spectra excited by the same wavelengths. Especially, the material SBA-KH-20%-2py possesses the strongest fluorescence intensity. Moreover, in the recognition experiments, it can definitely distinguish Ag + ions in aqueous solutions, which shows the excellent selectivity and high sensitivity.