Polymer-inorganic membranes modified with graphene-containing composite: Electrochemical approach to investigations of functional properties

• Published in: Materials today : proceedings Vol. 50; pp. 507 - 513
• Main Authors: Dzyazko, Yu, Rozhdestveska, L., Ogenko, V., Borysenko, Yu, Bildukevich, A., Plisko, T., Zmievskii, Y.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2022
• Subjects: Baromembrane separation; Composite membrane; Hydrated zirconium dioxide; Membrane potential; Oxidized grapheme; Baromembrane separation; Membrane potential; Hydrated zirconium dioxide; Composite membrane; Oxidized grapheme
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2021.11.303

Polymer ultrafiltration membranes were modified by embedding nanoparticles of hydrated zirconium dioxide and graphene oxide into pores. As opposed to pristine membranes, the modified polymers show membrane potential in NaCl solutions. The dependencies of the membrane potential on the solution concentration have been outlined. The sign and value of the derivative of the appropriated polynomial function give the information about counter-ions, and reflect rejection. The membranes modified with hydrated zirconium dioxide are amphoteric, the rejection of Ca2+ and Mg2+ ions reaches 8–20% during baromembrane desalination of water. The membranes containing this carbon nanomaterial show permeability mainly towards cations. These membranes reject SO42- anions, which are usually contained in water. The retention of hardness ions (12–25%) is due to electroneutrality of the solution. The strongest effect of the modifier on rejection is shown by the materials that are characterized by the smallest size of pores of the polymer active layer. These composite membranes demonstrate the slowest ion transport.