| 一维TiO2锐钛矿/金红石异相结的制备及光催化降解甲醛性能 | |
| One-Dimensional TiO2 Anatase/Rutile Heterophase Junctions: Preparation and Photocatalytic Properties for Degrading Formaldehyde | |
| 摘要: TiO2异相结主要通过高温方法制备，所制备材料的形貌和组成较难控制，尤其是在较低温度下一步制备一维 TiO2异相结仍具有一定的挑战性。采用简单、方便的一步水热法，在较低温度下(180 ℃)制备了一维纳米TiO2异相结材料。X射线衍射(XRD)和高分辨透射电镜(HRTEM)分析表明，制备的材料以一维金红石相TiO2纳米棒(长度：(400±50) nm，直径：(60±5) nm)为基本结构，粒径分布均匀的锐钛矿相TiO2纳米粒子(直径：(9.5±0.5) nm)高密度、单分散地负载在纳米棒上。通过控制水热反应时间成功调控了异相结中锐钛矿相 TiO2的含量(20%~50%)，进而实现了其光催化降解 HCHO性能的调控。实验结果表明，当锐钛矿相 TiO2的含量为 33% 时(TiO2-24，水热时间 24 h 制备的样品)，异相结光催化剂表现出最佳的 HCHO 降解性能：在低光强LED灯(波长为365 nm，光强为12.26 mW·cm-2)照射下，浓度约为120 mg·L-1的HCHO气体在25 min后的降解率达到了92%，实现了高效、快速地去除空气中的 HCHO(矿化为 CO2)。稳态荧光光谱和光电化学测试表明，与其他水热时间的样品相比，TiO2-24具有更高效的光生电荷分离和传输效率。一维TiO2异相结不仅有利于光生电荷的传输，而且对电荷的分离具有定向驱动作用，使其具有较高的光催化降解HCHO性能。 | |
| 关键词: TiO2 异相结 HCHO 光催化 降解 | |
| 基金项目: 国家自然科学基金(No.21972082)资助 | |
| Abstract: TiO2 heterophase junctions are mainly prepared by high-temperature method, and it is difficult to control the morphology and composition of the prepared materials. Especially, it is still challenging to prepare a one-dimensional TiO2 heterophase junction at a lower temperature. In this paper, a simple and convenient one-step hydrothermal method was developed prepared one-dimensional nano-TiO2 heterophase junctions at a relatively low temperature (180 ℃ ). X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analyses show that the one-dimensional rutile TiO2 nanorods (length: (400±50) nm, diameter: (60±5) nm) are the basic structure of the prepared materials, and the anatase TiO2 nanoparticles with uniform size distribution (diameter: (9.5±0.5) nm) are loaded on the nanorods in a high-density, monodispersed form. By adjusting the hydrothermal time, the anatase TiO2 contents in the prepared materials could be controlled within the range of 20%-50%. The TiO2 heterophase junctions were successfully applied to the photocatalytic degradation of formaldehyde. When the content of anatase phase TiO2 was 33% (TiO2-24, the hydrothermal time was 24 h), the TiO2 heterophase junction had the best formaldehyde degradation performance. After 25 min photocatalytic reaction, the 92% of formaldehyde (120 mg·L-1) was degraded into CO2 under a low-intensity LED lamp (wavelength: 365 nm, light intensity: 12.26 mW·cm-2), confirming the efficient activity of the TiO2 heterophase junction. Steady-state fluorescence spectroscopy and photoelec-trochemical tests showed that charge separation and transfer efficiencies on TiO2-24 were much higher than those on other samples prepared at different hydrothermal times. The one-dimensional TiO2 heterophase junction not only is beneficial to the transfer of photogenerated charge but also can directionally drive the separation of the charges, which makes one-dimensional TiO2 heterophase photocatalyst has a higher formaldehyde degradation performance. | |
| Keywords: TiO2 heterophase junction HCHO photocatalytic degradation | |
| 投稿时间：2021-11-02 修订日期：2022-01-19 | |
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| 查凤娟,刘庆,王建友,林雨寒,王传义,李英宣.一维TiO2锐钛矿/金红石异相结的制备及光催化降解甲醛性能[J].无机化学学报,2022,38(3):510-518. | |
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