Hexagonal boron nitride stationary phase for gas chromatography

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Gas chromatography (GC) is a crucial analytical technique.
• Development of novel stationary phases is essential for improved separation.
• Hexagonal boron nitride (h-BN) is a 2D material with unique properties.

Purpose of the Study:

• To evaluate the separation performance of hexagonal boron nitride (h-BN) as a stationary phase in capillary gas chromatography (GC).
• To compare h-BN with other stationary phases like g-C3N4 and polysiloxanes.

Main Methods:

• Static coating of h-BN onto a capillary column.
• GC analysis of various analytes including naphthalene, n-dodecane, PAHs, PAEs, and halogenated compounds.
• Evaluation of column efficiency, retention, selectivity, repeatability, and thermal stability.

Main Results:

• h-BN columns demonstrated moderate polarity and good column efficiencies (3455–3800 plates/m).
• h-BN exhibited preferential retention for polycyclic aromatic hydrocarbons (PAHs) over phthalic acid esters (PAEs).
• Superior separation of structural and positional isomers and halogenated analytes was observed.
• Excellent run-to-run (0.03%-0.07% RSD) and day-to-day (0.31%-0.71% RSD) repeatability.
• Thermal stability up to 260°C.

Conclusions:

• h-BN is a viable and advantageous stationary phase for capillary GC.
• h-BN offers high resolution and selectivity for challenging separations, including isomers and PAHs.
• The material shows excellent stability and repeatability, making it suitable for routine analysis.