Metal nanoparticles have attracted considerable scientific attention due to their interesting characteristics and enhanced physical and chemical properties as compared to the conventional bulk materials, reason for that they are widely employed in various application such as catalysis, sensors, biomedicine, optoelectronics or solar cells manufacturing. Their quality of absorbing light in a large domain of the solar spectrum (visible and UV light) is intensively exploited in the design of efficient photocatalytic materials active in sunlight, and have already been tested for a variety of reactions, from mineralization of organic pollutants to fine organic reactions. Good candidates for this application are semiconductor materials (e.g. TiO2, ZnO, CeO2) and noble metal nanoparticles (NPs) (Au, Ag). The selection of the polymer substrates for the immobilization of the active catalyst particles is motivated by several advantages displayed by them, such as: environmental stability, chemical inertness and resistance to ultraviolet radiations, mechanical stability, low prices and easy availability. Additionally, the use of polymer nanocomposites as photocatalysts offers the possibility of a facile separation and reuse of the materials, eliminating thus the post-treatment separation processes and implicitly reducing the costs of the procedure. From our point of view, the most convenient technique to prepare polymer-NPs materials with catalytic properties is the photocuring technology (photopolymerization/ photocrosslinking of a mixture of acrylic monomers and premade NPs or NPs precursors) because is very simple, non-invasive and does not require expensive devices, finally resulting flexible free-standing polymer films. Our group focused on the development of new catalysts based on TiO2 [1-3], ZnO [4] or noble metal (Ag, Au) NPs [5] immobilized in a photocrosslinked matrix, which were further tested in photodecomposition of some model pollutants such as phenol derivatives or organic dyes. The performed studies were mainly targeted on the preparation, photocatalytic activity, strategies directed toward the increase of photocatalytic efficiency under visible-light and reuse of the hybrid polymer catalysts.