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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Silver and Indium Oxide Codoped TiO2 Nanocomposites with Enhanced Photocatalytic Activity
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Silver and Indium Oxide Codoped TiO2 Nanocomposites with Enhanced Photocatalytic Activity

机译：银和氧化铟共掺杂的TiO2纳米复合材料具有增强的光催化活性

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Metallic silver and semiconductor indium oxide codoped titania nanocomposites were prepared by a one-step sol—gel-solvothermal method in the presence of a triblock copolymer surfactant (P123). The resulting Ag/ In2O3—TiO2 three-component systems mainly exhibited an anatase phase structure, high crystallinity, and extremely small particle sizes with metallic Ag particles well-distributed on the surface. Compared with pure anatase TiO2, the Ag/In2O3—TiO2 systems showed narrowing of the band gap due to the change in the band position caused by the contribution of the In 5s5p orbits to the conduction band. By tuning loadings of Ag or In2O3 and molar ratios of titanium source to the surfactant, size and dispersion of the product particles can be controlled. As-prepared Ag/In2O3—TiO2 nanocomposites were used as the photocatalysts to degrade dye rhodamine B (RB) and methyl ter-butyl ether (MTBE) in the liquid phase. At 2.0% Ag and 1.9% In2O3 doping, the Ag/In2O3—TiO2 system exhibited the highest UV-light photocatalytic activity, and nearly total degradation of dye RB (25 mg L~(-1)) or MTBT (200 mg L~(-1)) was obtained after 45 or 120 min UV-light irradiation. In addition, the UV-light photocatalytic activity of three-component systems exceeded that of the single (TiO2) and two-component (Ag/TiO2 or In2O3—TiO2) systems as well as the commercial photocatalyst, Degussa P25. Reasons for this enhanced photocatalytic activity were revealed.
机译：在三嵌段共聚物表面活性剂（P123）存在下，通过一步溶胶-凝胶-溶剂热法制备金属银和半导体氧化铟共掺杂的二氧化钛纳米复合材料。所得的Ag / In2O3-TiO2三组分体系主要表现出锐钛矿相结构，高结晶度和极小的粒径，且金属Ag颗粒分布在表面上。与纯锐钛矿型TiO2相比，由于In 5s5p轨道对导带的贡献引起的能带位置变化，Ag / In2O3-TiO2体系的带隙变窄。通过调节Ag或In 2 O 3的负载量以及钛源与表面活性剂的摩尔比，可以控制产物颗粒的尺寸和分散度。所制备的Ag / In 2 O 3 -TiO 2纳米复合材料用作光催化剂，以在液相中降解染料若丹明B（RB）和甲基叔丁基醚（MTBE）。 Ag / In2O3-TiO2体系在2.0％Ag和1.9％In2O3掺杂下表现出最高的紫外光催化活性，几乎完全降解了染料RB（25 mg L〜（-1））或MTBT（200 mg L〜 （-1））是在45或120分钟的紫外线照射后获得的。此外，三组分体系的紫外线光催化活性超过了单组分（TiO2）和二组分（Ag / TiO2或In2O3-TiO2）体系以及商业光催化剂Degussa P25的紫外光催化活性。揭示了这种增强的光催化活性的原因。

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