A metal organic framework-polyaniline nanocomposite as a fiber coating for solid phase microextraction

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Solid-phase microextraction (SPME) is a widely used technique for sample preparation.
• Developing efficient and selective extraction materials is crucial for trace analysis.
• Metal-organic frameworks (MOFs) offer unique porous structures for enhanced adsorption.

Purpose of the Study:

• To synthesize and characterize a novel MOF/PANI nanocomposite for SPME applications.
• To develop and optimize a headspace-SPME (HS-SPME) method for chlorobenzene (CBs) determination.
• To evaluate the performance of the developed method for analyzing real-world water samples.

Main Methods:

• Electrodeposition of MOF/PANI nanocomposite on a stainless steel wire to create a SPME fiber.
• Optimization of synthesis and extraction parameters (e.g., deposition potential, time, MOF type, ionic strength, temperature).
• Analysis of chlorobenzenes using gas chromatography-mass spectrometry (GC-MS).

Main Results:

• The MOF/PANI nanocomposite exhibited a porous structure and superior extraction performance compared to PANI alone, especially with MOF2.
• Optimized HS-SPME method achieved low detection limits (<0.2 ng/L) and a wide linear dynamic range (0.5-1000 ng/L).
• High fiber-to-fiber reproducibility (4-7%) and excellent recovery rates (92-98%) in real water samples were demonstrated.

Conclusions:

• The electrodeposited MOF/PANI nanocomposite is a highly effective SPME fiber coating for chlorobenzene extraction.
• The developed HS-SPME-GC-MS method is sensitive, reproducible, and suitable for the trace analysis of chlorobenzenes in environmental water.
• This approach offers a promising alternative for environmental monitoring and contaminant analysis.