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    Dimethyl Isosorbide As a Green Solvent for Sustainable Ultrafiltration and Microfiltration Membrane Preparation

    Year: 2020

    Journal: ACS Sustain. Chem. Eng., Volume 8, JAN 13, page 659–668

    Authors: Russo, Francesca; Galiano, Francesco; Pedace, Francesco; Arico, Fabio; Figoli, Alberto

    Keywords: Membrane preparation; Dimethyl isosorbide (DMI); Green solvent; Vapor induced phase separation (VIPS); Polyvinylidene fluoride (PVDF); Poly(ether sulfone) (PES)

    Dimethyl isosorbide (DMI)-a well-known biobased high boiling green solvent-was used for the first time in the preparation of poly(vinylidene fluoride)- and poly(ether sulfone)-based membranes. Preliminary thermodynamic (Hansen and Hildebrand solubility parameters, relative energy difference) and kinetic (viscosity) studies on DMI confirmed that this solvent possesses the required physical/chemical properties to be exploited in casting membranes. Membranes were prepared by nonsolvent induced phase separation (NIPS) and a combination of vapor induced phase separation (VIPS)-NIPS techniques varying the exposure time to humidity. This latter approach led to the formation of membranes with a porous architecture avoiding the use of any pore forming additive. The so-prepared membranes were, then, fully characterized in terms of morphology, polymorphism (in case of PVDF), wettability, thickness, porosity, pore size, and water permeability. The membranes revealed different structures and a tunable pore size in the range of ultrafiltration (UF) and microfiltration (MF) that render them ideal for applications in water treatment processes.
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