Silver and Indium Oxide Codoped TiO 2 Nanocomposites with Enhanced Photocatalytic Activity
Silver and Indium Oxide Codoped TiO 2 Nanocomposites with Enhanced Photocatalytic Activity
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DOI：
10.1021/jp803559g
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发表时间：
2008-07
影响因子：
3.7
通讯作者：
Xia Yang;Yonghui Wang;Leilei Xu;Xiaodan Yu;Yihang Guo
中科院分区：
文献类型：
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作者：
Xia Yang;Yonghui Wang;Leilei Xu;Xiaodan Yu;Yihang Guo
在三嵌段共聚物表面活性剂（P123）的存在下，通过一步溶胶-凝胶-溶剂热法制备了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/In 2 O3 −TiO 2三组分体系主要表现出单相结构、高结晶度和极小的颗粒尺寸，金属Ag颗粒均匀分布在表面。Ag/In 2 O3 −TiO 2系统的禁带宽度比纯TiO 2系统的禁带宽度窄，这是由于In 5s 5 p轨道对导带的贡献引起的能带位置的变化。通过调节Ag或In 2 O3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性。以制备的Ag/In 2 O3 −TiO 2纳米复合材料为光催化剂，在液相中对染料罗丹明B（RB）和甲基叔丁基醚（MTBE）进行光催化降解.当Ag掺杂量为2.0%，In 2 O3掺杂量为1.9%，Ag/In 2 O3 −TiO 2体系的热稳定性最好.
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/In 2O 3−TiO 2 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 TiO 2, the Ag/In 2O 3−TiO 2 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 In 2O 3 and molar ratios of titanium source to the surfactant, size and dispersion of the product particles can be controlled. As-prepared Ag/In 2O 3−TiO 2 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% In 2O 3 doping, the Ag/In 2O 3−TiO 2 system exhibited the highest ...