Metal–organic frameworks (MOFs) toward SO₂ detection

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Abstract

Developing technology that can precisely monitor specific air pollutants in diverse settings is essential to control emissions and ensure safe exposure limits are not exceeded. Metal-organic frameworks (MOFs) are crystalline organic-inorganic hybrid materials, which are promising candidates for SO₂ detection. Their chemically mutable periodic structure confers outstanding surface area, thermal stability, and a well-defined pore distribution. Moreover, MOFs have exhibited extraordinary performance for SO₂ capture. Therefore, research has focused on their possible applications for SO₂ sequestration due to the selective and robust chemical and physical interactions of SO₂ molecules within MOFs. The variable SO₂ affinity presented by MOFs enables the adsorption mechanism and preferential adsorption sites to be resolved. However, for MOF-based SO₂ detection, selective SO₂ capture at shallow partial pressure (0.01-0.1 bar) is required. Thus, capturing SO₂ at low concentration is crucial for SO₂ detection, where textural properties of MOFs, mainly the pore-limiting diameter, are essential to achieve selective detection. In this review, we discuss the fundamental aspects of SO₂ detection in MOFs, providing a step-by-step methodology for SO₂ detection in MOFs. We hope this review can provide valuable background around SO₂ detection in MOFs and inspire further research within this new and exciting field.

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