| 一种简单的提高无定形TiO2光催化活性的方法及其在增透膜中的应用 |
| Simple Way to Enhance the Photocatalytic Activity and Application in Antireflective Coatings for Amorphous TiO2 |
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| 摘要: 通过简单的溶胶-凝胶法制备得到了小粒径的无定形TiO2粒子，并将其沉积在多孔SiO2膜层表面，多孔SiO2膜层大的表面积有助于无定形TiO2的良好分散，高度分散的无定形TiO2粒子对膜层的光学性能影响较小，通过匹配合适的低折射率的SiO2膜层，制备得到的SiO2&无定形TiO2（SiO2&amorphous-TiO2）膜层表现出和理想单层增透膜相似的光学性能。同时SiO2&amorphous-TiO2的光催化性能显著提高，明显高于单层无定形TiO2。而且SiO2&无定形TiO2膜层甚至表现出比相应的负载锐钛矿型TiO2的膜层，即SiO2&锐钛矿TiO2，更高的光催化活性，这一反常现象的原因是，无定型TiO2膜层表面丰富的羟基有助于减少空穴-电子对的复合，其相对疏松的结构能够加快光生电子-空穴的转移速率，而这些因素的影响超过了晶型结构对光催化活性的影响。同时SiO2膜层的孔隙结构在浸渍-提拉镀制过程中，自发形成并不需要后续热处理过程，因此，整个SiO2&无定形TiO2膜层的制备均可在室温下完成，能够实现其在不耐热基片上的应用。 |
| 关键词: 溶胶-凝胶 无定形TiO2 SiO2 薄膜 防反射 光催化 |
| 基金项目: 国家自然科学基金（No.）资助项目 |
| Abstract: Small-sized amorphous TiO2 nanoparticles were prepared and deposited on mesoporous SiO2 support via sol-gel method at room temperature. This structure greatly increases the surface areas of the amorphous TiO2 particles, which facilitates the enhancement of photocatalytic activity and preserved the optical performance of the films in the same time. The resultant SiO2&amorphous-TiO2 films afford glasses a maximum transmittance of 99.97% and show a much higher photocatalytic activity than the monolayer amorphous TiO2 film. Surprisingly, the SiO2&amorphous-TiO2 even shows a higher photocatalytic activity than the counterparts with anatase phase. This higher photocatalytic activity is attributed to abundant surface hydroxyl groups and relative loose structure of the amorphous TiO2 nanoparticles, which can help enhance photocatalytic activity through reducing recombination of electron-hole pairs and increase the migration rates of the photoexcited electrons and holes, respectively. And these characteristics may be preferable to crystal structure for enhancing photocatalytic activity. Meanwhile, the coating process is very simple, low cost and conducted at room temperature, which is feasible for polymer substrates. |
| Keywords: sol-gel process amorphous titanates silicates thin films antireflection photocatalysis |
| 投稿时间：2018-03-22 修订日期：2018-06-12 |
| 摘要点击次数: 1554 |
| 全文下载次数: 1314 |
| 李远洋,晏良宏,江波.一种简单的提高无定形TiO2光催化活性的方法及其在增透膜中的应用[J].无机化学学报,2018,34(9):1701-1709. |
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