Zinc aluminate particles were semiconductor with the band gap of 3.8 ev (approx.) and widely studied as the photocatalytic material for the degradation of many organic pollutants such as methyl orange, methylene blue, reactive red 141, phenol, toluene. Zinc aluminate (ZnAl2O4) nano particles were prepared by co-precipitation method using aqueous ammonia solution as the precipitating agent. The zinc aluminate nanoparticles were characterized by powder XRD, FT-IR, and UV-DRS. The XRD pattern confirmed the formation of single phase ZnAl2O4 cubic spinel without impurities. The photocatalytic activity of the compound was studied using Rhodamine-B-a xanthene dye and crystal violet under UV light. © Research India Publications.