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The application of photocatalytic oxidation (PCO) in VOCs degradation is greatly hindered at high humidity levels. This is because VOCs compete with water molecules to adsorb on the generally hydrophilic photocatalyst surface, where photocatalytic reactions take place. Modified P25-TiO₂ nanoparticles with surface fluorination (F-P25) was prepared to reduce the surface hydrophilicity of Degussa P25. The prepared samples were characterized by BET, SEM, and XPS tests. Herein, the effects of surface fluorination on the adsorption capacity of P25-TiO₂ nanoparticles towards toluene, methyl ethyl ketone (MEK), and isobutanol, representing different classes of indoor air pollutants, were investigated. After surface fluorination, the adsorption capacity of modified TiO₂ was compared to bare-TiO₂ in a continuous reactor at four different relative humidity levels (i.e., 0, 20, 40, and 60%). Three adsorption isotherms …