Detection of SO2 using a hybrid LDH-MOF material

Abstract

A hybrid MgAlFe-LDH/UiO-66-NH2 material has been developed for the efficient detection of SO2, showing an exceptionally low detection limit of only 0.72 ppm, which is considerably lower in comparison to UiO-66-NH₂ (739 ppm). Spectroscopic studies suggest that the preferential oxidation of SO2 to 〖SO〗_4^(2-), catalysed by the Fe3+ centres within the MgAlFe-LDH, is the key factor in the enhanced fluorescence response. This process in-situ generates Fe2+ sites and favours the interlaminar sequestration of SO2, preventing direct interaction with the active sites of UiO-66-NH2.