Regenerable VOC filters with improved selectivity and efficacy

Process for purifying a gaseous environment, by selective adsorption of aldehyde volatile organic compounds (VOCs) from the gaseous environment over non-aldehyde VOCs, comprising the step of contacting the gaseous environment to be purified with a porous water-stable Metal-Organic Framework (MOF) material, wherein the MOF material comprising an average pore size <40 {acute over (Å)} and a hydrophilic core formed by basic groups and hydrogen-bond accepting or donating oxygenated species in the MOF material, wherein the basic groups are covalently bound to the MOF material without binding to the metal sites of the MOF material, wherein the ligands in the MOF material are N-containing heterocyclic ligands having available at least one of the basic groups embedded within the ligand itself not involved in binding to the metal sites of the MOF material and wherein the crystal structure of the MOF material, as measured by X-Ray diffraction pattern or IR spectroscopy, and average pore size, as calculated by the nitrogen adsorption/desorption isotherm method at −196° C. under 105 Pa, remain unchanged within experimental error, after being exposed to a gaseous environment with 50% relative humidity (RH) for 24 hours at 100° C. and atmospheric pressure, or after being placed in water at 100° C. for 12 hours.