The study presents a sustainable method for synthesizing nonmetal (phosphate, nitrogen, and carbon, PNC)-doped titanium dioxide (TiO₂) nanoparticles (NPs) using waste valorization. These NPs were characterized using various techniques, including vibrational and photoelectron spectroscopy, electron microscopy, diffraction, and thermal analysis. The PNC-doped TiO₂-NPs exhibited enhanced photocatalytic activity, achieving 96% removal of surface-adsorbed pollutants under natural sunlight or UV, while maintaining the stability of the paint formulation. The origin of the self-cleaning properties was attributed to the strong inhibition of photoinduced electron-hole recombination, which was 7.3 times higher than that of a benchmark P25 photocatalyst. The nonmetal dopants also hindered the anatase/rutile phase transformation, even after 700 °C calcination. The PNC-doped TiO₂-NPs were successfully incorporated into water-based paints, demonstrating their potential for commercial applications in self-cleaning coatings.The study presents a sustainable method for synthesizing nonmetal (phosphate, nitrogen, and carbon, PNC)-doped titanium dioxide (TiO₂) nanoparticles (NPs) using waste valorization. These NPs were characterized using various techniques, including vibrational and photoelectron spectroscopy, electron microscopy, diffraction, and thermal analysis. The PNC-doped TiO₂-NPs exhibited enhanced photocatalytic activity, achieving 96% removal of surface-adsorbed pollutants under natural sunlight or UV, while maintaining the stability of the paint formulation. The origin of the self-cleaning properties was attributed to the strong inhibition of photoinduced electron-hole recombination, which was 7.3 times higher than that of a benchmark P25 photocatalyst. The nonmetal dopants also hindered the anatase/rutile phase transformation, even after 700 °C calcination. The PNC-doped TiO₂-NPs were successfully incorporated into water-based paints, demonstrating their potential for commercial applications in self-cleaning coatings.