UCLA

Graphene oxide (GO) enhanced amine-functionalized titanium metal organic framework (NH2-MIL-125(Ti)) was fabricated via a facile microwave solvothermal process by using GO, C12H28O4Ti, and 2-aminoterephthalic acid as precursors. Under the microwave, the surface functional group of GO could act as antenna for fast absorbing microwave energy which results hot spots on the GO sheet (hot-spots effect). These hot-spots allowed heterogeneously formation of highly-crystallized NH2-MIL-125(Ti) nanocrystals on GO. Meanwhile, efficient electron hole separation path way was achieved, supported by XRD, Raman, UV-vis and so on. Such GO/ NH2-MIL-125(Ti) hybrid exhibited great enhancement of visible-light absorption, photocurrent intensity, electron carrier density and a lower photo-generated electron-hole recombination rate, compared to the pure NH2-MIL-125(Ti). Therefore, the as-obtained hybrid system was proved highly efficient for photocatalytic oxidation of gaseous pollutants, such as nitric oxide (NOx) and acetaldehyde with long durability, under visible light (λ > 420 nm) irradiation.