Metal-organic frameworks cavity size effect on the extraction of organic pollutants.

Publication in Materials Letters.

Equipe LHYS

Zirconium Metal-organic frameworks (MOFs, UiO-66 and UiO-67) have been used for the removal fromaqueous solutions of persistent fluorinated pollutants, perfluorooctanoic acid (PFOA) and perfluorooc-tanesulfonic acid (PFOS). The two isostructural materials differ in cavity size, defined by the ligand,bdc (benzene-dicarboxylic acid) or bpdc (biphenyl-dicarboxylic acid) for UiO-66 and UiO-67 respectively.Both materials enable efficient sorption of PFOA and PFOS. Sorption kinetics and isotherms have been experimentally determined, and thermodynamic parameters ΔH°, ΔS°and DG° have been determined.UiO-67 shows higher sorption capacities (up to 743 mg/g for PFOA and 585 mg/g for PFOS) compared to these of UiO-66 (388 and 160 mg/g for the sorption of PFOA and PFOS respectively) with a change inthe sorption mechanism.

Lire l'article DOI :

Karima Sini, Damien Bourgeois, Madjid Idouhar, Michaël Carboni and Daniel Meyer, Materials letters 250, p 92 (2019)