The synthesis of AC-CdO-TiO2 nanocomposite material has been successfully achieved by precipitation method and sonication technique. High photocatalytic activity of AC-CdO-TiO2 nanocomposite material used Reactive Black 5 (RB 5) under UV-light irradiation and that of TiO2; the nanocomposite material was characterized by High-Resolution Scanning Electron Microscopy (HR-SEM) with Elementary Dispersive X-ray (EDX), High-Resolution Transmission Electron Microscopy (HR-TEM), XRD analysis, Photoluminescence spectroscopy (PL) and UV-Vis DRS analysis. This nanocomposite material obtained by photodegradation of RB 5 dye at various parameters is reported. The reaction of this nanocomposite material was found to be stable and reusable. The antibacterial activity of prepared material was investigated against Gram negative and positive bacterial strains and through their electrochemical activity.