A renovation of non-aqueous Al~(3+) sensor to aqueous media sensor by/ simple recyclable immobilize electrospun nano-fibers and its uses for live sample analysis

摘要

A conventional colorimetric/fluorescent chemosensor R2PP was used to detect the Al~(3+) ion in CH_3CN/DMSO (2:8, v/v) medium at nanomolar level (LOD=8.5 × 10~(-9) M). The 2:1 binding stoichiometry of the metal complex was established on the basis of combined UV-vis and fluorescence spectroscopy and ESI-MS. The binding sites were confirmed by FT-1R and ~1H NMR spectroscopy and ESI mass analysis. This conventional chemosensor R2PP was renovated from non-aqueous medium to aqueous medium by R2PP blended polyurethane electrospun (ES) nanofibers. This ES nanofibers has selectively sense the Al~(3+) over other transition metal cations in solid state. The ES nanofibers could detect Al~(3+) onsite and in real time, and the color of the nanofibers changed rapidly after they were immersed in an aqueous solution (video S1). In addition, the R2PP blended nanofibers exhibits reversibility and 'OFF-ON-OFF' sensing behavior with Na_2EDTA. Finally, the R2PP-nanofiber kit has been successfully utilized to detect Al~(3+) in real sample testing.