How does the presence of a metal coating (such as Au) on TiO₂ nanoparticles affect the photocatalytic degradation of 1,4-dioxane?

Label:chem

Topic
Metal coatings on photocatalysts like TiO₂ can influence the efficiency of photocatalytic processes by affecting the separation of electron-hole pairs and enhancing light absorption. A study examines the impact of an Au coating on the photocatalytic degradation of 1,4-dioxane using TiO₂ nanoparticles.
Answer
The presence of an Au coating on TiO₂ nanoparticles significantly enhances the photocatalytic degradation of 1,4-dioxane. The Au coating acts as an electron sink, sequestering photogenerated electrons from the conduction band of TiO₂ and preventing their recombination with holes. This leaves more holes available to react with water to form hydroxyl radicals, which are responsible for the degradation of 1,4-dioxane. Additionally, the Au coating increases the concentration of oxygen vacancies in TiO₂, which act as electron traps, further reducing electron-hole recombination and enhancing photocatalytic activity.
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