What is the significance of the spatial distribution of light absorption in Au/TiO₂ Janus nanoparticles for photocatalytic degradation?

Label:chem

Topic
The spatial distribution of light absorption within photocatalytic nanoparticles can influence the efficiency of electron-hole pair generation and their subsequent reactivity. A study investigates the spatial distribution of light absorption in Au/TiO₂ Janus nanoparticles and its impact on the degradation of 1,4-dioxane.
Answer
The spatial distribution of light absorption in Au/TiO₂ Janus nanoparticles is critical for photocatalytic degradation. Finite-element simulations revealed that 254 nm UV light is absorbed predominantly near the surface of the TiO₂, where the electron-hole pairs can readily react with water to form hydroxyl radicals. In contrast, 365 nm UV light is absorbed deeper within the particle, requiring holes to travel a greater distance before reacting with water, which reduces the overall degradation efficiency. The near-surface absorption of 254 nm light, combined with the electron-sequestering effect of the Au coating, maximizes the availability of holes for hydroxyl radical formation, thereby enhancing the degradation of 1,4-dioxane.
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