Sensitive ratiometric sensor for Al(III) detection in water samples using luminescence or eye-vision

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Aluminum ions are prevalent environmental contaminants.
• Accurate detection of aluminum ions is crucial for water quality assessment.
• Existing detection methods may lack sensitivity or selectivity.

Purpose of the Study:

• To develop a facile, quick, and sensitive ratiometric luminescence sensor for aluminum ion detection.
• To utilize a europium(III) complex with 3-(2-naphthoyl)-1,1,1,-trifluoro acetone (3-NTA) for this purpose.
• To enable both quantitative and qualitative (visual) detection of aluminum ions.

Main Methods:

• Design and synthesis of a europium(III) complex with 3-NTA.
• Investigation of luminescence changes upon interaction with aluminum ions.
• Optimization of detection conditions in methanol.
• Ratiometric analysis using emission intensity ratio (F480nm/F615nm).
• Visual luminescence color change observation under UV light.

Main Results:

• The sensor exhibited suppressed Eu(III) emission (615 nm) and enhanced ligand emission (480 nm) in the presence of aluminum ions.
• Quantitative detection was achieved in the range of 0.1-100 µM with a limit of detection (LOD) of 0.27 µM.
• Visual detection showed a color change from red to green with increasing aluminum ion concentration.
• The probe demonstrated high selectivity for aluminum ions over other metal ions.
• Effective application in real water samples with good results.

Conclusions:

• A novel luminescent lanthanide complex-based ratiometric probe for aluminum ion detection has been developed.
• The sensor provides a sensitive, selective, and visually observable method for aluminum ion analysis in water.
• This approach offers a promising tool for environmental monitoring and water quality assessment.