Catalysis Today, Vol.340, 86-91, 2020
An unusual dependency on the hole-scavengers in photocatalytic reductions mediated by a titanium-based metal-organic framework
The reductive reactions driven by photo-generated electrons on photocatalysts were generally considered to be irrelevant to the employed hole-scavengers. Herein, we report an unexpected dependence of photocatalytic debromination of decabromodiphenyl ether (BDE 209) on the hole-scavengers catalyzed by amine-functionalized MIL-125(Ti). It was found that the debromination only occurred when triethanolamine, rather than the conventional alcohols, was used as the hole-scavenger. Further low-temperature ESR experiments indicate that triethanolamine participates in the formation of the active catalytic Ti (III) species, which shuttle the electron to BDE 209, producing reductive debromination products.