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

Karima Sini (1, 2) , Damien Bourgeois (1) , Madjid Idouhar (2) , Michaël Carboni (1) , Daniel Meyer (1)

1 LHyS - Systèmes HYbrides pour la Séparation
2 USTHB - Université des Sciences et de la Technologie Houari Boumediene = University of Sciences and Technology Houari Boumediene [Alger]

Zirconium Metal−Organic Framework materials (MOF, UiO-66 and UiO-67) have been used for the removal from aqueous solutions of persistent fluorinated pollutants, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic 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 both PFOA and PFOS. Sorption kinetics and isotherms have been experimentally determined, and thermodynamic parameters ΔH°, ΔS° and ΔG° have been determined. UiO-67 shows higher sorption capacities (up to 743 mg.g-1 for PFOA) compared to these of UiO-66 (388 and 160 mg.g-1 for the sorption of PFOA and PFOS respectively) with a change in the sorption mechanism.

Keywords: Perfluorinated Pollutants; Hydrophobic interaction; Waste water treatment; Metal-Organic Framework; Porous materials

Domains: Chemical Sciences; Material chemistry

Karima Sini, Damien Bourgeois, Madjid Idouhar, Michaël Carboni, Daniel Meyer. Metal-organic frameworks cavity size effect on the extraction of organic pollutants. Materials Letters, 2019, 250, pp.92-95. ⟨10.1016/j.matlet.2019.04.113⟩. ⟨cea-02443598⟩