PHOTODEGRADATION OF MODERN PAINTINGS via TiO2-INDUCED PHOTOCATALYTIC PROCESS

This paper explores the potential of titanium dioxide (TiO₂) nanoparticles in the conservation and/or restoration process of some artifacts, highlighting their photocatalytic nature, which often contributes to the degradation of painted surfaces. UV light radiation affects the photocatalytic properties of TiO₂, allowing it to break down organic contaminants on the surface of paintings, and sometimes lead to color changes in the painted layers. Several techniques are used to evaluate the efficacy of TiO₂ nanoparticles: Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), UV-Vis Spectrophotometry, FTR and Raman, as well as colorimetry and glossmetry. The radicals generated by the interaction between TiO₂ and UV light can break down the pigment present in the paint, leading to coating, discoloration, and loss of the integrity of the artwork over time. The case of commercial pigment 588 is discussed.