How do Au/TiO₂ Janus nanoparticles enhance the degradation of 1,4-dioxane under UV light?

Label:chem

Topic
1,4-Dioxane is a recalcitrant water contaminant that is difficult to degrade using conventional methods. Advanced oxidation processes (AOPs) using UV light and photocatalysts like TiO₂ have shown promise, but their efficiency is often limited by the recombination of electron-hole pairs in TiO₂. A study explores the use of Au/TiO₂ Janus nanoparticles (JNPs) to enhance the degradation of 1,4-dioxane under UV light.
Answer
The Au/TiO₂ Janus nanoparticles significantly enhance the degradation of 1,4-dioxane under UV light by increasing the number of photogenerated holes in TiO₂ that can react with water to form hydroxyl radicals. This enhancement is due to two main factors: (1) the increased light absorption by TiO₂ under 254 nm UV light, which creates more electron-hole pairs near the surface, and (2) the sequestration of photogenerated electrons by the Au coating, preventing recombination and leaving more holes available to react with water. The optimal condition for degradation was achieved using 254 nm UV light at high intensity, resulting in a first-order rate constant of 0.138 min⁻¹, which is among the highest reported for 1,4-dioxane degradation without chemical additives.
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