Ordered mesoporous silica film as a novel fiber coating for solid-phase microextraction

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Traditional solid phase microextraction (SPME) fibers often use fragile fused silica, limiting their robustness.
• Chlorophenols (CPs) are common environmental pollutants requiring sensitive detection methods.

Purpose of the Study:

• To develop a novel SPME fiber using ordered mesoporous silica (OMS) supported on anodized titanium wire.
• To evaluate the fiber's performance for extracting chlorophenols from aqueous samples.

Main Methods:

• Fabrication of OMS film on anodized titanium wire via solvent evaporation-induced self-assembly (EISA) and dip-coating.
• Characterization of the OMS film using N2 adsorption-desorption, FT-IR, SEM, and TG analysis.
• Extraction of chlorophenols followed by determination using gas chromatography flame ionization detection (GC-FID).

Main Results:

• The OMS material exhibited a well-ordered mesostructure with uniform pores.
• The OMS film was successfully grafted onto the titanium wire, creating a stable coating.
• The developed SPME method showed wide linear ranges (0.2-200 μgL-1), low detection limits (0.03-0.12 μgL-1), and good repeatability (6.2-9.8%).
• The fiber demonstrated excellent thermal and solvent stability and was successfully applied to natural water samples.

Conclusions:

• The OMS-supported titanium wire fiber is a robust, stable, and cost-effective alternative to commercial SPME fibers.
• This new fiber offers high extraction capacity and good stability for environmental monitoring of chlorophenols.