Wang Tao, Zhu Li, Zhu Wanying, Kanda Hideki
Department of Materials Process Engineering, Nagoya University, Nagoya, 464-8603, Japan.
Heliyon. 2023 Jul 27;9(8):e18718. doi: 10.1016/j.heliyon.2023.e18718. eCollection 2023 Aug.
TiC/TiO hybrids are environment-friendly and exhibit excellent photocatalytic and hydrogen-generating power characteristics. Herein, a novel single-step method is proposed for fabricating multilayer structures in which TiO, generated from (NH)TiF, wraps the TiC MXene by etching TiAlC with (NH)TiF. The optimal reaction conditions for the etching of TiAlC with (NH)TiF were systematically studied. The phase composition, morphology, and photophysical properties of the TiC/TiO hybrids were investigated using X-ray diffraction, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and UV-vis spectrophotometry. The thermal stability of the hybrids was investigated using thermogravimetric and differential thermal analyses. Along with the formation of TiC MXene, TiAlC reacted with (NH)TiF at 60 °C for 24 h to form hybrids surrounded by NHTiOF crystals. Subsequent reactions of these hybrids with HBO resulted in the conversion of NHTiOF crystals into TiO and eventually into TiC/TiO hybrids. Furthermore, the photocatalytic activity of the TiC/TiO hybrids was measured by monitoring the photodegradation of methylene blue under ultraviolet light, which showed that the photocatalytic activity of the TiC/TiO hybrids was higher than that of the commercial anatase TiO nanoparticles.
TiC/TiO杂化物具有环境友好性，并展现出优异的光催化和产氢能力特性。在此，提出了一种新颖的单步方法来制备多层结构，其中由(NH₄)₂TiF₆生成的TiO₂通过用(NH₄)₂TiF₆蚀刻TiAlC来包裹TiC MXene。系统研究了用(NH₄)₂TiF₆蚀刻TiAlC的最佳反应条件。使用X射线衍射、场发射扫描电子显微镜、能量色散X射线光谱、透射电子显微镜、X射线光电子能谱、拉曼光谱和紫外可见分光光度法研究了TiC/TiO杂化物的相组成、形态和光物理性质。使用热重分析和差示热分析研究了杂化物的热稳定性。随着TiC MXene的形成，TiAlC在60℃下与(NH₄)₂TiF₆反应24小时，形成被NH₄TiOF晶体包围的杂化物。这些杂化物随后与HBO反应导致NH₄TiOF晶体转化为TiO₂，最终转化为TiC/TiO杂化物。此外，通过监测亚甲基蓝在紫外光下的光降解来测量TiC/TiO杂化物的光催化活性，结果表明TiC/TiO杂化物的光催化活性高于商业锐钛矿型TiO₂纳米颗粒。
