Detection of SO₂ using a hybrid LDH-MOF material

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 SO₄^2-, catalysed by the Fe³⁺ centres within 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.