Yang Jingling, Wu Qili, He Shiman, Yan Jing, Shi Jianying, Chen Jian, Wu Mingmei, Yang Xianfeng
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, Key Laboratory of Environment and Energy Chemistry of Guangdong Higher Education Institutes, School of Chemistry and Chemical Engineering and Instrumental Analysis and Research Center, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.
Nanoscale. 2015 Sep 7;7(33):13888-97. doi: 10.1039/c5nr03807c.
A TiO2 film has been facilely grown on a Ti foil via a general and simple acid vapor oxidation (AVO) strategy. Based on detailed characterization by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), we found that the TiO2 film was composed of anatase nanoarrays highly oriented along their <001> direction, resulting in a large exposed {001} top surface on the film. The growth mechanism based on a topotactic transformation was proposed according to a careful study of time-dependent experimental results. Resulting from the evaluation of photocatalytic performance compared with a commercial TiO2 photocatalyst (Degussa P25), the as-prepared oriented anatase TiO2 film showed higher efficiency for degradation of atrazine and acid orange II (AOII). The performance of photocatalysis is highly relevant to the preferential orientation. The efficient photocatalysis could be attributed to the highly reactive {001} facets on the anatase nanoarrays with super-hydrophilicity.
通过一种通用且简单的酸蒸汽氧化（AVO）策略，二氧化钛薄膜已轻松生长在钛箔上。基于使用X射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）进行的详细表征，我们发现该二氧化钛薄膜由沿其<001>方向高度取向的锐钛矿纳米阵列组成，从而在薄膜上形成了大面积暴露的{001}顶面。根据对随时间变化的实验结果的仔细研究，提出了基于拓扑转变的生长机制。与商用二氧化钛光催化剂（Degussa P25）相比，通过对光催化性能的评估，所制备的取向锐钛矿二氧化钛薄膜对阿特拉津和酸性橙II（AOII）的降解显示出更高的效率。光催化性能与优先取向高度相关。高效的光催化作用可归因于锐钛矿纳米阵列上具有超亲水性的高活性{001}晶面。
