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The synthesis of two MO (Tl2O3–SiO2) Schiff bases complexes derived from MO (2-hydroxy,3-methoxy,5-nitro benzaldehyde)-1,2-ethylene diamine (L1) and MO (2-hydroxy-5-bromo benzaldehyde)-1,2-ethylene diamine (L2) is reported. Full characterization of these complexes was accomplished with elemental analyses, spectroscopic studies (IR, 1H NMR, EDX, TEM and SEM). photocatalytic and absorption properties of these nanoparticle (Tl2O3–SiO2-MoL1, Tl2O3–SiO2-MoL2) were compared. For this purpose, the ability of nanoparticles in the removal of MB was studied by UV–vis spectroscopy in the specified intervals. the equilibrium removal capacity of MB on Tl2O3–SiO2-MoL1 and Tl2O3–SiO2-MoL2 nanoparticles were equal to 5.5 and 23 mg/g, respectively. The benefits of this protocol are short reaction time, simple workup procedure, and high yields of products and Easy work‐up, chemical stability and simple recyclability are the most important advantages of this catalytic activity system.