This study shows the inactivation of antibacterial and dye removal in aqueous solution via photocatalysis with an easy fabrication route of silver deposited titanium dioxide/cobalt ferrite composite nanoparticles through a three-stage process applied under ultrasonic irradiation. An adsorption kinetic and equilibrium isotherm were investigated by four kinetic and five isotherm models. Then, photocatalytic potential and antibacterial activity were assessed, respectively, by photodegradation of cationic dye under UV light and four bacteria employing MIC and MBC indices coupled to SPM observation, which illustrated that the bactericidal effect is desirable to inhibit growth. Moreover, the nanocomposite can be easily isolated from the solution via magnetic decantation for removing catalytic pollutants.