Robust CA-GO-TiO2/PTFE Photocatalytic Membranes for the Degradation of the Azithromycin Formulation from Wastewaters

Author:

Satulu Veronica1,Pandele Andreea Madalina23,Ionica Giovanina-Iuliana2,Bobirică Liliana2,Bonciu Anca Florina1ORCID,Scarlatescu Alexandra14ORCID,Bobirică Constantin2,Orbeci Cristina2,Voicu Stefan Ioan23ORCID,Mitu Bogdana1ORCID,Dinescu Gheorghe14ORCID

Affiliation:

1. National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Str., 077125 Magurele, Romania

2. Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology Politehnica Bucharest, Polizu 1-7, 011061 Bucharest, Romania

3. Advanced Polymers Materials, National University of Science and Technology Politehnica Bucharest, 011061 Bucharest, Romania

4. Faculty of Physics, University of Bucharest, 077125 Magurele, Romania

Abstract

We have developed an innovative thin-film nanocomposite membrane that contains cellulose acetate (CA) with small amounts of TiO2-decorated graphene oxide (GO) (ranging from 0.5 wt.% to 2 wt.%) sandwiched between two polytetrafluoroethylene (PTFE)-like thin films. The PTFE-like films succeeded in maintaining the bulk porosity of the support while increasing the thermal and chemical robustness of the membrane and boosting the catalytic activity of TiO2 nanoparticles. The membranes exhibited a specific chemical composition and bonding, with predominant carbon–oxygen bonds from CA and GO in the bulk, and carbon–fluorine bonds on their PTFE-like coated sides. We have also tested the membranes’ photocatalytic activities on azithromycin-containing wastewaters, demonstrating excellent efficiency with more than 80% degradation for 2 wt.% TiO2-decorated GO in the CA-GO-TiO2/PTFE-like membranes. The degradation of the azithromycin formulation occurs in two steps, with reaction rates being correlated to the amount of GO-TiO2 in the membranes.

Publisher

MDPI AG

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