In the present investigation, TiO2 microspheres were decorated by bimetallic nanoparticles (Ag/Au, Ag/Pt, Ag/Pd, Au/Pt, Au/Pd and Pt/Pd) induced by photodeposition method to improve its photocatalytic activity. The prepared samples were characterized by X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopic (XPS), photoluminescence spectrometry (PL), diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM-EDX) and inductively coupled plasma-mass spectrometry (ICP-MS). The photocatalytic activity of obtained samples was investigated in phenol degradation process under UV-vis and Vis light irradiation (lambda > 420 nm). The highest photoactivity under UV-vis light was observed for Au/Pt_TiO2 and Pt/Pd_TiO2 photocatalysts (1.1 mu mol dm(-3) min(-1)) and under Vis for Ag/Pt_TiO2 (0.29,mol dm(-3) min(-1)). Obtained results indicated that direct electron transfer from the conduction band of TiO2 to the BNPs is responsible for photoactivity under UV-vis light during the phenol degradation process. (C) 2016 Elsevier B.V. All rights reserved.