A UiO-66 analogue with uncoordinated carboxylic acids for the broad-spectrum removal of toxic chemicalsElectronic supplementary information (ESI) available: Experimental procedures, X-ray diffraction spectra, N2 isotherms, Fourier-transform infrared spectra, and breakthrough curves. See DOI: 10.1039/c4nj02093f

Zirconium-based metal-organic frameworks (MOFs) are of great importance as sorbents due to their increased chemical and thermal stability when compared to other MOF families. Here we report a novel analogue of UiO-66 modified with oxalic acid via solvent-assisted ligand incorporation. This analogue has the ability to remove ammonia, cyanogen chloride, sulphur dioxide, nitrogen dioxide and octane at levels greater than or equal to the base UiO-66. We report here the highest known capacities exhibited by a MOF for SO 2 and NO 2 , at pressures less than 0.10 bar and at room temperature, by UiO-66-ox. Furthermore, we show here the importance of the secondary building unit of the MOF in the removal of ammonia and cyanogen chloride. A new metal-organic framework analogue is stable under ambient conditions with the ability to remove toxic gases.