Abstract: Provided herein are disinfection compositions, devices, systems and methods useful for decontamination and/or disinfection of water and other liquid solutions. The disclosed composite materials can comprise a germicidal surface comprising a support substrate, one or more micrometric aggregates of titanium oxide on the support substrate, the titanium oxide aggregates comprising chloride atoms, and one or more micrometric aggregates of silver attached to the chloride atoms of the titanium oxide aggregates, wherein the micrometric aggregates of titanium oxide with silver atoms have a germicidal activity. Methods of using the same for reducing or eliminating microorganisms in water or a fluid can comprise contacting water or fluid with microorganisms with the composite material, wherein the microorganisms in the water or fluid are reduced or eliminated from the water or fluid.