This is a report on the functionalization of track-etched membrane based on poly(ethylene terephthalate) (PET TeMs) by various advanced oxidizing systems/agents (H2O2/vis, H2O2/UV, Fenton/vis, Fenton/UV and O-3 treatment) to compare with KMnO4/H2SO4, for the purpose of increasing hydrophilicity and functionality thus expanding potential applications. The surface of functionalized PET TeMs was characterized by using colorimetric assay, contact angle measurements, X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), ATR-FTIR-spectroscopy, and Atomic Force Microscopy (AFM). Optimal conditions related to concentration of oxidizing agents and duration of treatment for each oxidation system was determined. Comparative analysis of oxidation systems was made and H2O2/UV and O-3 treatment were determined to provide the highest level of hydrophilicity and carboxylic acid functionality on the membranes under relatively milder conditions. (C) 2014 Elsevier Ltd. All rights reserved.