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首页> 外文期刊>Thin Solid Films >Fluorine-mediated porosity and crystal-phase tailoring of meso-macroporous F-TiO_2 nanofibers and their enhanced photocatalytic performance
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Fluorine-mediated porosity and crystal-phase tailoring of meso-macroporous F-TiO_2 nanofibers and their enhanced photocatalytic performance

机译：介孔的F-TiO_2纳米纤维的氟介导的孔隙度和晶体相修整及其增强的光催化性能

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摘要

We present the synthesis of surface-fluorinated, rutile-rich, meso-macroporous TiO2 nanofibers via simple posttreatment in a 5% hydrogen fluoride solution at room temperature and atmospheric pressure. Using various characterization methods, we demonstrate that the anatase phase of the nanofiber can be used as a sacrificial template to ensure appropriate porosity characteristics in the TiO2 nanofibers. From scanning electron microscopy results, it was confirmed that the dimensions of the nanofibers do not change after the hydrogen fluoride post-treatment. However, x-ray diffraction and transmission electron microscopy results confirm that the proportion of the rutile phase increases after hydrogen fluoride post-treatment. After hydrogen fluoride treatment, small pores with diameter below 10 nm almost disappear, and the pore size distribution ranges from mesopore (< 50 nm) to macropore (similar to 100 nm). The x-ray photoelectron spectroscopy results show the disappearance of the Si peak and surface fluorination after the treatment. Further, tests showed that nanofibers treated for 10 h and 20 h have excellent photocatalytic activity compared with pristine nanofibers. We expect hydrogen fluoride treated nanofibers to exhibit superior performance in certain applications where the rutile phase and meso-to macro-sized pores are desirable, such as heterogeneous catalysis and oxygen evolution.
机译：我们通过在室温和大气压下在5％氟化氢溶液中进行简单的后处理，来合成表面氟化的，富金红石型，介孔的TiO2纳米纤维。使用各种表征方法，我们证明了纳米纤维的锐钛矿相可以用作牺牲模板，以确保TiO2纳米纤维中适当的孔隙率特性。从扫描电子显微镜结果可以确认，纳米纤维的尺寸在氟化氢后处理后没有变化。然而，X射线衍射和透射电子显微镜结果证实，氟化氢后处理后金红石相的比例增加。氟化氢处理后，直径小于10 nm的小孔几乎消失了，并且孔径分布范围从中孔（<50 nm）到大孔（类似于100 nm）。 X射线光电子能谱分析结果表明，处理后Si峰消失，表面氟化。此外，测试表明，与原始纳米纤维相比，处理10小时和20小时的纳米纤维具有出色的光催化活性。我们期望氟化氢处理的纳米纤维在某些需要金红石相和介孔至大孔的应用中表现出优异的性能，例如多相催化和氧气释放。

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