Fluorinated MOF platform for selective removal and sensing of SO2 from flue gas and air.
Mohamed R. Tchalala,Prashant M. Bhatt,Karumbaiah N. Chappanda,Sérgio R. Tavares,Karim Adil,Youssef Belmabkhout,Aleksander Shkurenko,Amandine Cadiau,Nicolas Heymans,G. De Weireld,Guillaume Maurin,Khaled N. Salama,Mohamed Eddaoudi +12 more
TL;DR: It is demonstrated that two fluorinated metal–organic frameworks selectively remove SO2 from synthetic flue gas and can sense SO2 with p.p.m..
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Abstract: Conventional SO2 scrubbing agents, namely calcium oxide and zeolites, are often used to remove SO2 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 SO2 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 SO2. Direct mixed gas column breakthrough and/or column desorption experiments revealed an unprecedented SO2 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 SO2 at low concentrations ranging from 25 to 500 p.p.m.
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