Preparation of F-Doped TiO2 Photocatalysts by Gas-Liquid Plasma at Atmospheric Pressure
Preparation of F-Doped TiO2 Photocatalysts by Gas-Liquid Plasma at Atmospheric Pressure
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常压气液等离子体制备氟掺杂TiO2光催化剂
DOI：
10.1007/s11244-017-0763-7
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发表时间：
2017
影响因子：
3.6
通讯作者：
Di Lanbo
中科院分区：
文献类型：
--
作者：
Zhang Xiuling;Li Zhuang;Zhan Zhibin;Di Lanbo
采用气液冷等离子体技术，以NaF、NaF与[C4 MIM] HSO 4、[C4 MIM] BF 4为氟源，成功制备了F掺杂TiO 2。采用X射线衍射（XRD）、X射线光电子能谱（XPS）和N2吸附-脱附等温线（BET）对样品进行了表征。以亚甲基蓝染料为降解对象，在模拟太阳光下考察了样品的光催化活性。结果表明，不同氟源的掺杂均有利于形成间隙型F掺杂TiO 2，其中离子液体最有利于间隙型F掺杂TiO 2的形成。对0.6-F-[C4 MIM] BF 4-TiO 2样品在500 °C下的煅烧结果表明，间隙式F掺杂的TiO 2具有优异的热稳定性、合适的介孔结构、较高的比表面积（60.5 m2 g −1）和最佳的光催化活性。在太阳光照射下，MB降解率可达98%，其表观降解速率常数是光降解的42倍，是未加离子液体时的2.9倍。此外，还利用傅里叶变换红外光谱（FTIR）对离子液体在气液等离子体中的稳定性进行了研究和讨论。
F-Doped TiO2was successfully fabricated using gas–liquid cold plasma with different fluorine sources, including NaF, NaF combined with [C4MIM]HSO4, and [C4MIM]BF4. The samples were characterized by XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), and BET (N2adsorption–desorption isotherms). Photocatalytic activity of the samples was tested by degradation of methylene blue (MB) dye under simulated sunlight. The results show that doping with different fluorine sources was beneficial to form interstitial F-doped TiO2, and ionic liquids used in our work were most favorable to the formation of interstitial F-doped TiO2. Calcination of the 0.6-F–[C4MIM]BF4–TiO2sample at 500 °C shows that interstitial F-doped TiO2has an excellent thermal stability, a suitable mesoporous structure, higher specific surface area (60.5 m2g−1) and the best photocatalytic activity. MB degradation was about 98% under the stimulated sunlight for 30 min, and its apparent rate constant was 42 times higher than photolysis and was about 2.9 times as that prepared without addition of ionic liquid. Furthermore, the stability of ionic liquids in the gas–liquid plasma was also investigated and discussed with the assistance of Fourier transform infrared (FTIR) spectroscopy.