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Fe-doped titanate nanotubes were prepared by the combination of sol-gel process with hydrothermal treatment. After a further calcinations process, Fe-doped TiO 2 nanotubes (Fe/TiO 2 NTs) with high photocatalytic activity were obtained. The prepared catalysts were characterized by XRD, TEM, and XPS. The photocatlytic activity of Fe/TiO 2 NTs was evaluated through the photodegradation of aqueous methyl orange. The experiments demonstrated that the 0.5% Fe/TiO 2 NTs calcined at 300°C possessed the best photocatalytic activity. Compared with pure TiO 2 nanotubes, the doping with Fe significantly enhanced the photocatalytic efficiency.

Electron transfer between metal-oxides and supports considerably affects the oxidative desulfurization (ODS) performance of catalysts, while this is far from being well understood. Herein, molybdenum dioxide with oxygen vacancies (V O -MoO 2 ) catalysts derived from Mo-based metal-organic frameworks are anchored on electron-rich nitrogen-doped carbon nanotubes (NC) to obtain excellent ODS activity and reusability. Results show that either dibenzothiophene (DBT) or 4,6-dimethyldibenzothiophene (4,6-DMDBT) is removed 100% on the composite catalyst (V O -MoO 2 @NC) within 40 min of reaction when cumene hydroperoxide is chosen as an oxidant. After five cycles of reaction, DBT and 4,6-DMDBT removal still exceeded 99.5 and 95.0%, respectively. Results from density functional theory calculations and characterizations confirm that the strong electron-donating effect of NC on V O -MoO 2 can promote the dispersion of V O -MoO 2 and reduce the bond energy of the MoO bond, leading to exposure of active sites and enrichment of oxygen vacancies (V O ).Furthermore, the strong interfacial electrostatic interaction caused by the electron transfer from NC to V O -MoO 2 can reduce the leaching of active sites of the catalyst. This study provides a versatile strategy of constructing strong electronic interaction between metal-oxide and support via anchoring on NC for the design of high-performance ODS catalysts.