Cu‐MOF‐808 as a Sensing Material for Gaseous Hydrogen Sulfide

Abstract

The selective detection of hydrogen sulfide (H 2 S) is an important task because of its potentially hazardous effects not only on the environment but also on human health. Here, we present the zirconium-based MOF-808, which was modified with copper salts, as a colorimetric sensor material for the visible, reversible and sensitive H 2 S detection at room temperature. The copper cations, which are incorporated in the oxidation state + II, are installed at the inorganic building units (IBUs) of the framework so that they are accessible for interactions with H 2 S. The activated copper doped MOF-808 powder shows significant and fast color change in the presence of H 2 S, which can be detected by UV-vis spectroscopy. Moreover, the detection process is reversible by heating the material to 120 °C under ambient conditions leading to its decolorization. The detection performance of the material was studied by in situ UV-vis measurements in a reaction chamber. The material was able to respond to 100 ppm H 2 S in several cycles of exposure and heating to 120 °C under moist air conditions in a defined wavelength range. This reversibility is very uncommon for copper-based H 2 S sensing reactions and highlights the potential of MOFs as selective sensing materials.

Transition metal and lanthanide modified MOF-808 for barcode design

“…Several batches of MOF-808 were synthesized at a gram scale according to the previous literature. 20 In this work, only acetic acid was used for the modulated synthesis of the framework. The resulting white powders show not only high crystallinity as determined by PXRD (see ESI Fig.…”

“…The synthesis of water-based MOF-808 was performed in round-bottom flasks under reflux conditions and stirring using a modified approach published before. 19,20 ZrCl 4 (30 mmol, 1 eq.) and H 3 btc (10 mmol, 0.33 eq.)…”