Park Hyunsu, Goto Tomoyo, Cho Sunghun, Nishida Hisataka, Sekino Tohru
The Institute of Scientific and Industrial Research (ISIR), Osaka University, 8-1 Mihogaoka, Osaka 567-0047, Japan.
ACS Omega. 2020 Aug 20;5(34):21753-21761. doi: 10.1021/acsomega.0c02734. eCollection 2020 Sep 1.
Visible light-activated yellow titanate nanotubes (TNTs) modified by peroxo groups were directly synthesized via a facile chemical reaction route using peroxo titanium complex ions as a precursor. Obtained peroxo-modified TNTs (PTNTs) possessed a cylindrical-shaped tubular morphology with an outer diameter of approximately 10 nm. The peroxo titanium functional group (Ti-O-O) was formed between the interlayers of the lepidocrocite-type titanate crystal that was the base structure of TNTs, with the interlayer distance estimated at approximately 10.02 Å. The formation of the peroxo functional groups reduced the electron density adjacent to the titanium atom, raising the valence band to 1.35 eV and forming a band gap of 2.50 eV, which is lower than that of TNTs (3.19 eV). In addition, the peroxo titanium functional group had a negative potential, which increased the chemical adsorption performances with positively charged rhodamine B molecules in water. Meanwhile, the photocatalytic investigation indicated that the PTNTs have enhanced the photocatalytic performance for RhB decolorization under visible light irradiating in comparison with TNTs. These findings show not only the improvement in the photocatalytic performance but also the potential of processing design by selecting the precursor with arbitrary characteristics.
通过使用过氧钛络合离子作为前驱体的简便化学反应路线，直接合成了由过氧基团修饰的可见光活化的黄色钛酸纳米管（TNTs）。所获得的过氧修饰的TNTs（PTNTs）具有圆柱形管状形态，外径约为10 nm。过氧钛官能团（Ti-O-O）在作为TNTs基本结构的纤铁矿型钛酸盐晶体的层间形成，层间距离估计约为10.02 Å。过氧官能团的形成降低了钛原子附近的电子密度，将价带提高到1.35 eV，并形成了2.50 eV的带隙，低于TNTs的带隙（3.19 eV）。此外，过氧钛官能团具有负电位，这增加了与水中带正电荷的罗丹明B分子的化学吸附性能。同时，光催化研究表明，与TNTs相比，PTNTs在可见光照射下增强了对RhB脱色的光催化性能。这些发现不仅表明了光催化性能的提高，而且还展示了通过选择具有任意特性的前驱体进行工艺设计的潜力。
