γ-Bismuth molybdate (γ-Bi2MoO6) catalyst has been successfully synthesized by co-precipitation method and followed by calcination using stoichiometry ratio of bismuth nitrate, nitric acid, ammonium molybdate as precursor materials. The synthesized γ-Bi2MoO6 nanoparticles characterized by X-ray diffraction for identifying crystalline phases and particle size, Raman spectroscopy identifies active species during the reaction, Fourier transform infrared spectroscopy is to identify adsorbed species and to study the way in which these species are chemisorbed at the surface of the catalyst, UV-visible diffuse reflectance spectroscopy (UV-DRS) revealed for band energy of semiconductors, Field emission scanning electron microscopy (FE-SEM) is to determine morphology and shape of supported particles and Energy dispersive X-ray analysis (EDX) is for elemental analysis of synthesized nanoparticles. The photocatalytic activity of γ− Bi2MoO6 catalyst evaluated using the degradation of Rhodamine-B, Crystal Violet and Orange II dyes under visible light irradiation at room temperature.

The influences of the various preparation parameters (including