Gas Adsorption for Surface Area (BET) and Pore Size Analysis (BJH)

Determination of surface area (BET) and pore size distribution (BJH) of solid, porous adsorbent materials is done by Gas Adsorption. Adsorption and desorption isotherms are obtained using Nitrogen at cryogenic conditions under vacuum, and analysis is done using BET and BJH theoretical frameworks.

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Gas Adsorption for Surface Area (BET) and Pore Size Analysis (BJH)

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The technique encompasses external area and pore area evaluations to determine the total specific surface area in m2/g.

The BJH analysis method, also known as Barrett-Joyner-Halenda, is used to study the pore size distribution of porous materials like zeolites, activated carbons, MXene, and metal-organic frameworks, including micropores and mesopores.

The pore size range for the nitrogen adsorption method is 2–50 nm [4]. For samples with pore sizes less than 30 nm, gas adsorption is commonly used; for the sample with pore sizes less than 100 μm, mercury intrusion is used.

The BJH (Barrett, Joyner, and Halenda) method complements BET by calculating pore size distributions from experimental isotherms.

Activated carbon is used to remove odors, tastes, colors, or even poisons in liquid or gas form.

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