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Naphthalimide-based fluorescent polymeric probe: a dual-phase sensor for formaldehyde detection.

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A new fluorescent probe detects formaldehyde (FA) in water and air. This water-soluble polymer shows

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Area of Science:

  • Polymer Chemistry
  • Environmental Science
  • Analytical Chemistry

Background:

  • Formaldehyde (FA) is a prevalent indoor and outdoor pollutant with significant health risks.
  • Sensitive and efficient detection methods are crucial for environmental monitoring and public health protection.

Purpose of the Study:

  • To develop a water-soluble polymeric fluorescent probe for sensitive and selective formaldehyde detection.
  • To enable detection of formaldehyde in both aqueous and vapor phases.
  • To investigate the sensing mechanism and explore practical applications.

Main Methods:

  • Synthesis of a naphthalimide-conjugated water-soluble polymer.
  • Fluorimetric detection of formaldehyde in aqueous solution and vapor phase.
  • Characterization using electrospray ionization mass spectrometry (ESI-MS) and nuclear magnetic resonance (NMR) titration.
  • Density functional theory (DFT) analysis for mechanism investigation.
  • UV light-induced covalent attachment of the polymer onto filter paper.

Main Results:

  • The polymer probe exhibits a 'turn-on' fluorescence response to formaldehyde.
  • Selective detection of formaldehyde with a low detection limit of 1.36 nM in aqueous medium.
  • Confirmation of imine bond formation via ESI-MS and NMR.
  • Demonstration of formaldehyde vapor sensing using polymer-functionalized filter paper.

Conclusions:

  • A novel polymeric fluorescent probe provides a sensitive and selective method for formaldehyde detection.
  • The probe is effective in both aqueous and vapor phases, offering versatile applications.
  • Functionalized filter paper demonstrates a practical approach for on-site formaldehyde vapor monitoring.