A major problem in water purification is the presence of nitrogenous compounds that are not effectively removed by traditional methods such as ammonia stripping, ion exchange, and bacterial denitrification. A process that has been proposed to eliminate these toxic compounds utilizes the photocatalytic activity of titanium (IV) oxide. The catalyst was doped with platinum to enhance the selective oxidation of ammonia to inert nitrogen gas. The platinized titanium (IV) oxide was adhered to acrylic using dichloromethane as a solvent. The optimum platinum concentration for ammonia oxidation was investigated. Total nitrogen reduction was verified by summing the concentrations of NO3-N, NO2-N, and NH3-N in solution during the course of the reaction.