Kowaka Yasuyuki, Nozaki Kosuke, Mihara Tomoyuki, Yamashita Kimihiro, Miura Hiroyuki, Tan Zhenquan, Ohara Satoshi
Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan.
State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin 124221, China.
Materials (Basel). 2023 Jan 31;16(3):1229. doi: 10.3390/ma16031229.
TiO nanosheets have been studied as photocatalysts in various fields, and their performance has been actively improved. Herein, we prepared titania nanosheets with a smaller size than those reported previously with a side length of 29 nm and investigated their photocatalytic activity. (NH)TiF and Ti(OBu) were used as raw materials, and the F/Ti ratio was varied in the range of 0.3 to 2.0 to produce a series of samples with different side lengths by hydrothermal synthesis. A reduction in the F/Ti ratio led to the reduced size of the titanium nanosheets. The photocatalytic activity of each sample was evaluated through the degradation of methylene blue (MB) under ultraviolet (UV) irradiation (365 nm, 2.5 mW/cm). UV irradiation promoted the decomposition of MB, and the highest degradation efficiency was achieved using titania nanosheets prepared with a F/Ti ratio of 0.3. The high catalytic activity can be attributed to the increase in the surface area due to size reduction. The ratio of the {001} surface exposed on the titania nanosheet also affected the photocatalytic activity; it resulted in increased activation of the reaction. This study demonstrates that further activation of the photocatalytic activity can be achieved by adjusting the size of titania nanosheets.
二氧化钛纳米片已作为光催化剂在各个领域得到研究，其性能也在不断积极改进。在此，我们制备了边长为29 nm、尺寸比之前报道的更小的二氧化钛纳米片，并研究了它们的光催化活性。以(NH)TiF和Ti(OBu)为原料，通过水热合成法改变F/Ti比在0.3至2.0范围内，制备了一系列具有不同边长的样品。F/Ti比的降低导致钛纳米片尺寸减小。通过在紫外光（365 nm，2.5 mW/cm）照射下亚甲基蓝（MB）的降解来评估每个样品的光催化活性。紫外光照射促进了MB的分解，使用F/Ti比为0.3制备的二氧化钛纳米片实现了最高的降解效率。高催化活性可归因于尺寸减小导致的表面积增加。二氧化钛纳米片上暴露的{001}面的比例也影响光催化活性；这导致反应的活化增加。本研究表明，通过调整二氧化钛纳米片的尺寸可以进一步激活光催化活性。
