S. Q. . Raji and A. T. . Bader, “Synthesis and Characterization of Co3O4 and ZnO Nanoparticles Based on Schiff Base Complexes as a Precursor to the Photocatalytic Photodegradation of Congo Red Dye”, sci. technol. indones., vol. 10, no. 2, pp. 420–431, Mar. 2025.