Background:The widespread presence of organic dyes in the various industries'effluent such as paper, textile, and clothing has led to significant environmental pollution.Titanium oxide nanoparticles (TiO2) immobilized on zeolite (ZSM-5) wereinvestigated underUVlight foractivation of peroxymonosulfate (PMS) for photocatalytic degradationof Orange II (OII) dye in aqueous solutions. Methods: In this study, the photocatalyst used was prepared by immobilizing different amounts of TiO2 nanoparticles on ZSM-5. Characterization analysesincluding XRD, FTIR, BET, SEM, and EDS were performed on the synthesized samples. Then, the effect of various parameters, such as TiO2 nanoparticles loading onto the ZSM-5, pH, contact time, dye concentration, and TiO2/ZSM-5 dosage, is investigatedfor the removal of OII as a model molecule under the UV irradiation with 15 W power. Results: The highest removal percentageof OII dye(97.44%) was obtained in the optimal operating conditions of pH=3, the initial dye concentration=5 ppm, amount of TiO2/ZSM-5=10 mg/l, amount of PMS =50 mg/l, and reaction time=120 min. The Langmuir–Hinshelwood kinetics model fitted with the experimental data. Conclusion: The obtained results of this research showed that PMS can be used as a suitable oxidantactivatedwith ZSM-5/TiO2 nanocomposite in OII degradation in different water environments, by optimizing the effective operating factors.
