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The production of titanium dioxide (TiO2) films on boron-doped diamond (BDD) surfaces to carry out heterojunctions has for some time become an attractive alternative to enhance the properties of both materials, in order to develop efficient photo-assisted processes to solve environmental problems, for example, the degradation of different industrial chemicals such as dyes, pharmaceuticals, pesticides, and metal ions, by this process tested in bench-scaled stirred are reviewed. The combination of these materials offers several advantages in water treatment, such as environmental compatibility, versatility, high efficiency, and safety, because they operate at room conditions. These key processes are carried out by means of photoelectrochemical treatments based on the degradation of organic compounds at photoanode from electrode reactions. Electrooxidation is the common electrochemical technique based on the destruction of organics at the anode via water discharge to promote free radicals (•OH), and the photocatalysis determined by the capacity of the catalyst to produce electron–hole pairs which generate free radicals that are able to undergo secondary reactions. Its concrete application was made possible through the discovery of water electrolysis by using TiO2. Now, the trend is the formation of films of TiO2 on the BDD to create highly efficient photoanodes through heterojunctions. In this chapter, we will present the most common synthesis methods used in the production of films, the physical and electrochemical characterization techniques that are used to study the new surfaces, some significant parameters on the decolorization, degradation, mineralization, and energy consumption are analyzed. As an important consideration, the decay kinetics of organic compounds and the evolution of intermediates are presented. |
