What is the role of UV light wavelength in the photocatalytic degradation of 1,4-dioxane using Au/TiO₂ Janus nanoparticles?

Label:chem

Topic
The efficiency of photocatalytic degradation processes can be influenced by the wavelength of the UV light used. A study investigates the impact of different UV wavelengths (254 nm and 365 nm) on the degradation of 1,4-dioxane using Au/TiO₂ Janus nanoparticles.
Answer
The wavelength of UV light plays a crucial role in the photocatalytic degradation of 1,4-dioxane using Au/TiO₂ Janus nanoparticles. The study found that 254 nm UV light resulted in significantly higher degradation rates compared to 365 nm UV light. This is because 254 nm light is more efficiently absorbed by TiO₂, creating more electron-hole pairs near the surface where they can react with water to form hydroxyl radicals. Additionally, the finite-element simulations showed that 254 nm light was absorbed preferentially near the TiO₂/water interface, whereas 365 nm light was absorbed deeper within the particle, requiring holes to travel a greater distance before reacting with water, thus reducing efficiency.
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