Hydrothermal synthesis and photocatalytic properties of titania nanotubes synthesized from amorphous titanium hydroxide
KAI Li1,2, WANG Lina1,3, SHI Zhiming1
1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China; 2. School of Physics and Intelligent Manufacturing Engineering, Chifeng University, Chifeng 024000, China; 3. Students' Affairs Office, Inner Mongolia University of Finance and Economics, Hohhot 010051, China
Abstract：The nanotube synthesis process greatly influences the microstructure and photocatalytic characteristics of titania (TiO2) nanotubes. Most studies have synthesized nanotubes using anatase crystals or mixtures of anatase and rutile crystals. This study investigated the effect of the precursor on the formation of TiO2 nanotubes and on their photocatalytic properties by using hydrothermal synthesis of TiO2 nanotubes using amorphous titanium hydroxide (Ti(OH)4) as the titanium source. This study then analyzed the phase evolution and the morphology of the hydrothermal synthesized products and characterized the physical and chemical properties of the TiO2 nanotubes. The results show that the optimal temperature for the hydrothermal synthesis is 150 ℃ for 16 h. The hydrothermal product was first washed with water, then acid, and then with water again. The product was then calcined at 400 ℃ for 2 h to produce anatase nanotubes with good crystallinity. The hydrothermal reaction induced the amorphous Ti(OH)4 to transform into thin-flake sodium titanate (Na2Ti3O7). Then, the Na2Ti3O7 was transformed to titanate (H2Ti4O9) nanotubes induced by washing with water and acid. Finally, the calcination promoted conversion of the H2Ti4O9 nanotubes to anatase nanotubes. The greatest photocatalytic degradation occurred when the nanotubes were calcined at 400 ℃ for 2 h.
凯丽, 汪丽娜, 史志铭. 由非晶态氢氧化钛水热合成氧化钛纳米管及其光催化性能研究[J]. 清华大学学报（自然科学版）, 2022, 62(12): 2035-2042.
KAI Li, WANG Lina, SHI Zhiming. Hydrothermal synthesis and photocatalytic properties of titania nanotubes synthesized from amorphous titanium hydroxide. Journal of Tsinghua University(Science and Technology), 2022, 62(12): 2035-2042.
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2022, Vol. 62 
