TiO2/Polyethersulphone films for photocatalytic degradation of acetaminophen in aqueous solution

In this study, TiO2-polyethersulfone films with different TiO2 loadings, prepared by the phase inversion method were tested as photocatalysts for degradation of acetaminophen in aqueous solution. The prepared films were characterized by XRD, SEM-EDX, AFM, and XPS. The successful incorporation of the titanium dioxide nanoparticles was confirmed by the XRD and SEM-EDX. SEM images revealed a much smoother surface for the pristine PES as compared to the TiO2-PES films, while EDX result confirmed the immobilization of titanium, as increasing amounts of titania were detected with increased loading of titanium dioxide. The SEM cross sectional images also show that the prepared films transformed into porous structures with tear-like pores and the porosity increased from 0.06%, for pristine PES, to 0.35% for the (14 wt%) TiO2-PES, and then dropped slightly to 0.32% in (17 wt%) TiO2-PES due to the onset of aggregation. The TiO2-PES photocatalyst film with 14 wt% content of TiO2 exhibited 51% degradation efficiency for a film surface area of 80 cm(2), and a maximum efficiency of 80% at 320 cm(2) film surface area. However, an increased TiO2 loading up to 17 wt% led to a decline in efficiency which is attributed to agglomeration and possible defective pore structure of the films. The reactivity of the acetaminophen molecule, modelled using the density functional theory (DFT), enabled identification of the acetamido group and the aromatic ring as the regions most prone to electrophilic and radical attack, respectively. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study focused on TiO2-polyethersulfone films as photocatalysts for acetaminophen degradation, with varying TiO2 loadings. Characterization was done using XRD, SEM-EDX, AFM, and XPS. The study showed that the TiO2-PES film with 14 wt% TiO2 content exhibited 51% degradation efficiency at 80 cm(2) surface area, reaching a maximum of 80% at 320 cm(2).