- In this work, a composite of ZnO and polypyrrol (ZnO/PPy) was synthesized by polymerization method and characterized by X-ray diffraction (XRD), Ultraviolet-Visible with Near-infrared (UV-Vis NIR) spectroscopy and Fourier Transform Infrared (FT-IR) spectroscopy, both by diffuse reflectance mode. The ZnO/PPy composite was tested as photocatalyst for the degradation of acid violet 7 dye under visible light radiation in a continuous annular reactor. A three-resistance model of mass transfer showed in the continuous reactor that the degradation reaction was kinetically controlled. The Langmuir-Hinshelwood (LH) model was analyzed according the fitting of the experimental data in the annular continuous photocatalytic reactor and the set of criteria to validate the thermodynamic and kinetic parameters were satisfied. Copyright © American Institute of Chemical Engineers. All rights reserved.