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Photoluminescence: Applications01:14

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Fluorescent ion-imprinted polymers for selective Cu(II) optosensing.

Silvia C Lopes Pinheiro1, Ana B Descalzo, Ivo M Raimundo

  • 1Institute of Chemistry, University of Campinas, P.O. Box 6154, Campinas 13083-970, Brazil.

Analytical and Bioanalytical Chemistry
|December 17, 2011
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Summary

A novel fluorescent ion-imprinted polymer (IIP) was developed for selective copper ion detection in water. This optosensor offers high sensitivity and reusability for environmental monitoring.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Development of selective sensors for heavy metal detection is crucial for environmental monitoring.
  • Ion-imprinted polymers (IIPs) offer a promising approach for selective ion recognition.
  • Fluorescent sensors provide sensitive detection methods for trace analytes.

Purpose of the Study:

  • To synthesize and characterize a fluorescent ion-imprinted polymer (IIP) for the selective determination of copper ions (Cu(II)) in aqueous samples.
  • To evaluate the performance of the IIP-based optosensor for real-time water analysis.
  • To investigate the selectivity, sensitivity, and reusability of the developed sensor.

Main Methods:

  • Synthesis of a novel functional monomer, 4-[(E)-2-(4'-methyl-2,2'-bipyridin-4-yl)vinyl]phenyl methacrylate (BSOMe).
  • Preparation of Cu(II)-IIPs via radical polymerization using BSOMe and Cu(II) as the template ion.
  • Characterization of the monomer-ligand complex stability and stoichiometry.
  • Determination of Cu(II) using fluorescence quenching measurements.
  • Optimization of optosensor parameters including pH, ionic strength, and regeneration.

Main Results:

  • The BSOMe monomer formed a stable complex with Cu(II) with a stability constant of 2.04 × 10(8) mol(-2) l(2) and a stoichiometry of L(2)M.
  • The synthesized Cu(II)-IIP demonstrated a low detection limit of 0.04 μmol l(-1) for Cu(II) in water samples.
  • The sensor exhibited excellent selectivity for Cu(II) over other metal ions and maintained performance over 50 regeneration cycles.
  • Reproducibility was determined to be 3%.

Conclusions:

  • A highly selective and sensitive fluorescent ion-imprinted polymer (IIP) optosensor for copper ion determination has been successfully developed.
  • The IIP-based sensor is robust, reusable, and suitable for online monitoring of copper ions in water samples.
  • The novel BSOMe monomer facilitates the creation of effective imprinted polymers for targeted metal ion detection.