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In this brief, a comprehensive review of the UV/visible-TiO2 photocatalytic oxidation process is presented with an insight into the mechanisms involved, the role of titanium dioxide as a catalyst, irradiation sources, types of reactors, and a comparison between various modes of TiO2 application. An overview of the development and enhancement of the activity of TiO2 nanoparticles in photocatalysis is presented. The topics covered include a detailed look at the unique properties of the TiO2 nanoparticles and their relationship to photocatalytic properties. The utilization of the TiO2 nanoparticles as photocatalysts, in the non-doped and doped forms is also reviewed. Finally, the use of modified TiO2 nanoparticles has made a significant contribution in providing definitive mechanistic information regarding the visible light photocatalytic processes.

Chemical Engineering --- Chemical & Materials Engineering --- Engineering & Applied Sciences --- Sewage --- Titanium dioxide. --- Nanoparticles. --- Environmental chemistry. --- Purification --- Oxidation. --- Chemistry, Environmental --- Anatase --- Brookite --- Octahedrite --- Titania (Chemical) --- Titanic acid anhydride --- Titanic oxide --- Titanium oxide --- Titanium white --- Chemistry --- Ecology --- Nanostructured materials --- Particles --- Oxides --- Titanium compounds --- Oxidation --- Sewage disposal --- Chemical engineering. --- Nanotechnology. --- Industrial Chemistry/Chemical Engineering. --- Water Quality/Water Pollution. --- Environmental Chemistry. --- Molecular technology --- Nanoscale technology --- High technology --- Chemistry, Industrial --- Engineering, Chemical --- Industrial chemistry --- Engineering --- Chemistry, Technical --- Metallurgy --- Nano-particles --- NPs (Nanoparticles) --- Water quality. --- Water pollution. --- Aquatic pollution --- Fresh water --- Fresh water pollution --- Freshwater pollution --- Inland water pollution --- Lake pollution --- Lakes --- Reservoirs --- River pollution --- Rivers --- Stream pollution --- Water contamination --- Water pollutants --- Water pollution --- Pollution --- Waste disposal in rivers, lakes, etc. --- Freshwater --- Freshwater quality --- Marine water quality --- Quality of water --- Seawater --- Seawater quality --- Water --- Environmental quality --- Quality --- Composition