In Situ Infrared Observation of a Photo-Decomposition Process of Organic Contaminants on a TiO2 Nanotube Film Surface
In Situ Infrared Observation of a Photo-Decomposition Process of Organic Contaminants on a TiO2 Nanotube Film Surface
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DOI：
10.1149/2.1151915jes
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发表时间：
2019
影响因子：
3.9
通讯作者：
Teng Ma;Y. Kimura;Daisuke Tadaki;A. Hirano-Iwata;M. Niwano
中科院分区：
文献类型：
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作者：
Teng Ma;Y. Kimura;Daisuke Tadaki;A. Hirano-Iwata;M. Niwano
我们使用具有多重反射几何结构的红外吸收光谱 (MIR-IRAS) 研究了 TiO 2 纳米管 (NT) 表面的光催化反应。我们使用阳极氧化技术在用于 MIR-IRAS 测量的 Si 棱镜上形成一层排列良好的 TiO 2 NT 薄膜。内分泌干扰物邻苯二甲酸二辛酯（DOP）在TiO 2 NT 表面上的光催化分解过程被原位实时监测。我们证明了分子氧的存在促进了有机材料的光催化分解。观察到表面吸附的水分子的量在反应过程中发生变化。我们提出了一个简单的反应模型，可以重现水和 DOP 表面覆盖度随时间的变化。通过比较TiO 2 NT 薄膜和TiO 2 纳米颗粒(NP) 薄膜上有机材料的光分解，我们发现TiO 2 NT 薄膜比NP 薄膜具有更优异的光催化反应活性。我们认为NT结构为光生自由基和副产物的传输提供了更宽和更短的路径，从而导致与TiO 2 NPs相比更高的反应性。
We investigated a photocatalytic reaction on TiO 2 nanotube (NT) surfaces using infrared absorption spectroscopy with multiple-reflection geometry (MIR-IRAS). We used an anodization technique to form a film of well-aligned TiO 2 NTs on a Si prism used for MIR-IRAS measurements. The photocatalytic decomposition process of the endocrine disruptor, dioctyl phthalate (DOP), on the TiO 2 NT surface was monitored in-situ and in real time. We demonstrated that the photocatalytic decomposition of organic materials is promoted with the presence of molecular oxygen. It was observed that the amount of surface-adsorbed water molecules changed during the reaction. We proposed a simple reaction model that can reproduce the time-dependent change of the surface coverage of water and DOP. By comparing the photodecomposition of organic materials on TiO 2 NT films with that on TiO 2 nanoparticle (NP) films, we showed that TiO 2 NT films are superior in photocatalytic reactivity compared to NP films. We suggest that the NT structure provides wider and shorter paths for the transport of photo-generated radicals and byproducts, leading to a higher reactivity compared to TiO 2 NPs.