Jin Yong-Sheng, Wang Peng, Teng Shu-Hua
School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, Jiangsu, People's Republic of China.
Nanotechnology. 2020 Oct 2;31(40):405605. doi: 10.1088/1361-6528/ab9da6. Epub 2020 Jun 17.
A fast cyclohexanol solvothermal pathway was developed to prepare highly dispersed anatase titania (TiO) nanosheets with an edge length of ∼800 nm and a thickness of ∼6 nm. Under the synergistic control of hexafluorotitanic acid and cyclohexanol, the exposed 001 facets reached ∼98.5% on the TiO nanosheets obtained by the treatment at 180 °C for 150 min. Moreover, it was found that the phase transformation and structural development drastically occurred during the solvothermal treatment. When used as a catalyst for photodegradation of rhodamine B, the TiO nanosheets exhibited a good recycling stability and a much higher photocatalytic degradation rate (nearly 99% degradation within 2.5 h) than the commercial P25 (93.6%). After being uniformly loaded with 4 wt.% of the Pt nanoparticles, the TiO nanosheets displayed a photocatalytic hydrogen production rate of 2.239 mmol g h under simulated solar light, which was much higher than the pristine TiO nanosheets (0.045 mmol g h) as well as most of the reported TiO-based photocatalysts. The remarkable photocatalytic activity and good stability of the TiO nanosheets with highly exposed 001 facets would make them find potential applications in both water treatment and hydrogen generation from water splitting under solar light.
开发了一种快速环己醇溶剂热法来制备高度分散的锐钛矿型二氧化钛（TiO₂）纳米片，其边长约为800 nm，厚度约为6 nm。在六氟钛酸和环己醇的协同控制下，在180℃处理150分钟得到的TiO₂纳米片上，暴露的（001）晶面达到约98.5%。此外，发现溶剂热处理过程中发生了剧烈的相变和结构演变。当用作罗丹明B光降解的催化剂时，TiO₂纳米片表现出良好的循环稳定性，并且光催化降解率比商用P25（93.6%）高得多（2.5小时内降解近99%）。在均匀负载4 wt.%的Pt纳米颗粒后，TiO₂纳米片在模拟太阳光下的光催化产氢速率为2.239 mmol g⁻¹ h⁻¹，这远高于原始TiO₂纳米片（0.045 mmol g⁻¹ h⁻¹）以及大多数已报道的TiO₂基光催化剂。具有高度暴露（001）晶面的TiO₂纳米片具有显著的光催化活性和良好的稳定性，这将使其在水处理和太阳光下水分解制氢方面找到潜在应用。
