Fluorinated MOF platform for selective removal and sensing of SO<sub>2</sub> from flue gas and air.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30902992.
- Also identified by DOI 10.1038/s41467-019-09157-2 and PMC identifier 6430820.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Conventional SO<sub>2</sub> scrubbing agents, namely calcium oxide and zeolites, are often used to remove SO<sub>2</sub> 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<sub>2</sub> 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<sub>2</sub>. Direct mixed gas column breakthrough and/or column desorption experiments revealed an unprecedented SO<sub>2</sub> 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<sub>2</sub> at low concentrations ranging from 25 to 500 p.p.m.