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Conventional SO 2  scrubbing agents, namely calcium oxide and zeolites, are often used to remove SO 2  using a strong or irreversible adsorption-based process. However, adsorbents capable of sensing and selectively capturing this toxic molecule in a reversible manner, with in-depth understanding of structure–property relationships, have been rarely explored. Here we report the selective removal and sensing of SO 2  using recently unveiled fluorinated metal–organic frameworks (MOFs). Mixed gas adsorption experiments were performed at low concentrations ranging from 250 p.p.m. to 7% of SO 2 . Direct mixed gas column breakthrough and/or column desorption experiments revealed an unprecedented SO 2  affinity for KAUST-7 (NbOFFIVE-1-Ni) and KAUST-8 (AlFFIVE-1-Ni) MOFs. Furthermore, MOF-coated quartz crystal microbalance transducers were used to develop sensors with the ability to detect SO 2  at low concentrations ranging from 25 to 500 p.p.m.

Fluorinated MOF platform for selective removal and sensing of SO2 from flue gas and air