School of Environment and Energy, South China University of Technology, Guangzhou, 510006, People's Republic of China.
Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou, 510006, People's Republic of China.
Environ Sci Pollut Res Int. 2018 Dec;25(35):35342-35351. doi: 10.1007/s11356-018-3435-7. Epub 2018 Oct 20.
A series of anatase TiO nanosheets with different percentage of {001} facets ({001}TiO) were synthesized through a hydrothermal route using tetrabutyltitanate as a titanium precursor and HF as a shape controlling agent. The amount of HF exhibits an obvious influence on the structures and activities of TiO samples. The adsorbed surface F ions on the {001} facets of the anatase TiO were removed by washing them with NaOH solution. The as-prepared catalysts were characterized by X-ray diffraction, Brunner-Emmet-Teller measurements, ultraviolet-visible diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy techniques, and X-ray photoelectron spectroscopy analysis. The results indicated that all the as-prepared catalysts showed an anatase crystalline and nanosheet structure, as well as a strong ultraviolet light absorbance. With the increase of HF content, the crystallite size and the percentage of {001} facets increased first and later decreased, state the opposite change observed in BET. When the content of HF was 4.4 mL, the percentage of {001} facets reached the maximum up to 61.62%. After all samples were treated with 0.1 M NaOH solution, the percentage of {001} facets increased to a maximum of 64.46%. All the samples washed by NaOH solution exhibited much higher photocatalytic activity for NO oxidation under UV light irradiation than P25, {101}TiO, and {001}TiO without NaOH washing, suggesting that the surface F ions inhibited the photocatalytic NO oxidation. Moreover, the results showed that the NaOH-washed {001}TiO has a high humidity tolerance.
采用水热法，以四丁基钛酸酯为钛源，HF 为形貌控制剂，合成了一系列不同（001）晶面百分数的锐钛矿 TiO 纳米片（{001}TiO）。HF 的用量对 TiO 样品的结构和活性有明显的影响。用 NaOH 溶液洗涤，去除锐钛矿 TiO （001）晶面上吸附的表面 F 离子。采用 X 射线衍射、Brunauer-Emmett-Teller 测量、紫外-可见漫反射光谱、扫描电子显微镜、透射电子显微镜和 X 射线光电子能谱分析对所制备的催化剂进行了表征。结果表明，所有制备的催化剂均表现出锐钛矿晶型和纳米片结构，具有较强的紫外光吸收。随着 HF 含量的增加，锐钛矿的晶粒尺寸和（001）晶面的百分数先增加后减小，BET 观察到相反的变化。当 HF 的含量为 4.4 mL 时，（001）晶面的百分数达到最大值 61.62%。所有样品经 0.1 M NaOH 溶液处理后，（001）晶面的百分数最高可达 64.46%。经 NaOH 溶液洗涤后的所有样品在紫外光照射下对 NO 氧化的光催化活性均明显高于 P25、{101}TiO 和未经 NaOH 洗涤的{001}TiO，表明表面 F 离子抑制了光催化 NO 氧化。此外，结果表明，经 NaOH 洗涤的{001}TiO 具有较高的耐湿能力。
