Synthesis of TiO2 nanotubes: effect of post-treatment on crystallinity and photocatalytic activity
Synthesis of TiO2 nanotubes: effect of post-treatment on crystallinity and photocatalytic activity
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DOI：
10.1088/2053-1591/aa66dc
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发表时间：
2017-04
影响因子：
2.3
通讯作者：
Kyle Moriai;N. Nakajima;C. Moriyoshi;H. Maruyama
中科院分区：
文献类型：
--
作者：
Kyle Moriai;N. Nakajima;C. Moriyoshi;H. Maruyama
采用阳极氧化法制备了具有光催化活性的TiO 2纳米管。通过扫描电子显微镜、X射线衍射仪（XRD）和X射线吸收光谱仪（XAS）对TN的形貌和晶体结构进行了表征。结果表明，生长态TN的晶体结构是基于双晶结构。生长的TN的结晶度低，但在低于锐钛矿-金红石转变温度退火后增加。通过光催化降解亚甲基蓝水溶液的实验，评价了TN的光催化活性。结果表明，由于TN表面残留氟和结晶度低，其光催化活性很低。然而，漂洗和退火后处理大大提高TN活性，通过去除氟残留和增加结晶度。在450 °C下退火的TN由于其增加的结晶度和富含锐钛矿的相组成而显示出最高的光催化活性。
Photocatalytically active TiO2 nanotubes (TNs) were synthesized by anodizing a Ti foil. The morphology and crystal structure of the TNs were examined by scanning electron microscopy, x-ray diffraction (XRD), and x-ray absorption spectroscopy (XAS). It was revealed that the crystal structure of as-grown TNs was based on the anatase structure. The crystallinity of as-grown TNs was low but increased after annealing below the anatase-rutile transition temperature. The photocatalytic activity of the TNs was evaluated by the photocatalytic degradation of methylene blue aqueous solution. The as-grown TNs showed little photocatalytic activity owing to fluorine residue on the surfaces and their low crystallinity. However, rinsing and annealing post-treatment greatly enhanced TN activity by removing fluorine residue and increasing crystallinity. TNs annealed at 450 °C showed the highest photocatalytic activity due to their increased crystallinity and anatase-rich phase composition.