Hollow Square RodLike Microtubes Composed of Anatase Nanocuboids with Coexposed {100}, {010}, and {001} Facets for Improved Photocatalytic Performance

作者：Yi‐en Du, Xianjun Niu, Jing He, Leng Liu, Yufang Liu, Changdong Chen, Xiaojing Yang, Qi Feng · 发表于：ACS Omega · 年份：2020 · DOI：10.1021/acsomega.0c01827 · 被引用次数：16 · 研究领域：Advanced Photocatalysis Techniques、TiO2 Photocatalysis and Solar Cells、Advanced Nanomaterials in Catalysis

High Resolution Image Download MS PowerPoint Slide In this study, hollow square rodlike microtubes composed of anatase nanocuboids with coexposed {100}, {010}, and {001} facets were successfully synthesized via a mild hydrothermal treatment method in the presence of NH 4 F by using layered H 2 Ti 3 O 7 ribbons as the precursor. The precursor H 2 Ti 3 O 7 ribbons were prepared from H + /Na + ion-exchanged Na 2 Ti 3 O 7 . The suspension solution of protonated H 2 Ti 3 O 7 ribbons was adjusted to desired pH values (0.5–13.0) prior to hydrothermal treatment. The elongated direction of the microtubes is along the b axis, according to the profile of the H 2 Ti 3 O 7 ribbons. The transformation from staggered [Ti 3 O 7 ] 2– sheets to hollow square rodlike microtubes contained the formation and recombination of the dispersed octahedral [Ti(OH) 2 (OH 2 ) 4 ] 2+ monomers, the formation and growth of the initial anatase nuclei, and the reassembly of the anatase nanocuboids along the b -axis direction during the continuous hydrothermal process. The degradation rate of pH 0.5-TiO 2 was the highest at 1.66 × 10 –2 min –1, which was 1.3, 1.5, 2.0, 2.3, and 18.4 folds higher than that of pH 3.0-TiO 2 (1.27 × 10 –2 min –1 ), pH 7.0-TiO 2 (1.11 × 10 –2 min –1 ), pH 5.0-TiO 2 (0.83 × 10 –2 min –1 ), P25–TiO 2 (0.73 × 10 –2 min –1 ), and the blank sample (0.09 × 10 –2 min –1 ), respectively. Compared with P25–TiO 2 and the other anatase TiO 2 samples, pH 0.5-TiO 2 exhibited the best photocatalyt...