Here, hollow Fe³⁺ doped TiO₂ (Fe–TiO₂) octahedra were obtained via one-step hydrothermal method with MIL-101(Fe) as the template as well as the iron ion source. By introducing Ti precursor onto MIL-101(Fe) followed by HF etching and hydrothermal treatment, Fe-doped TiO₂ with high porosity and hollow structure was obtained. The as-synthesized Fe–TiO₂ octahedra consist of numerous small nanoparticles with particle sizes between 10 and 20 nm and possess a high specific surface area of 275 m² g⁻¹ together with uniform mesopores of 3.7 nm in pore diameter. After heat treatment in air at 500 °C (named Fe–TiO₂-500), the BET surface area and the mesopore size of the sample were changed to 202 m² g⁻¹ and 3.9 nm, respectively. Compared to other Fe-doping methods, this method reported here favors better and more uniform Fe doping into the TiO₂ lattice and improves the porosity and specific surface area. As a result of the Fe doping, the bandgaps of Fe–TiO₂ and Fe–TiO₂-500 were about 2.75 eV and 2.42 eV, respectively. Fe–TiO₂-500 shows excellent photocatalytic activity due to its special structure, high BET surface area and porosity. The yield of CH₄ is about 7.73 μmol g⁻¹ after loading of Pt within 12 h of reaction time under visible light illumination (λ > 420 nm).

在这里，以MIL-101（Fe）为模板并以铁离子源为原料，通过一步水热法获得了空心Fe ³⁺掺杂的TiO ₂（Fe–TiO ₂）八面体。通过将Ti前驱体引入MIL-101（Fe）中，然后进行HF蚀刻和水热处理，可以得到具有高孔隙率和中空结构的掺Fe TiO ₂。刚合成的Fe–TiO ₂八面体由许多粒径在10至20 nm之间的小纳米颗粒组成，具有275 m ²  g ^-1的高比表面积以及孔径为3.7 nm的均匀中孔。在500°C的空气中热处理后（称为Fe–TiO ₂-500），样品的BET表面积和中孔尺寸分别改变为202m ²  g ^-1和3.9nm。与其他Fe掺杂方法相比，此处报道的该方法有利于Fe更好且更均匀地掺杂到TiO ₂晶格中，并改善了孔隙率和比表面积。由于Fe的掺杂，Fe-TiO ₂和Fe-TiO ₂ -500的带隙分别约为2.75 eV和2.42 eV。Fe–TiO ₂ -500由于其特殊的结构，高的BET表面积和孔隙率而具有出色的光催化活性。CH ₄的产量约为7.73μmolg ^-1 在可见光照射下（λ> 420 nm），在反应时间的12小时内负载Pt之后。