Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance

Abstract

Cite as: Jia Lin, Xiaolin Liu, Shu Zhu, Yongsheng Liu. Anatase TiO2 nanotube powder film with high crystallinity for enhanced photocatalytic performance , nano Online We report on the synthesis of TiO2 nanotube (NT) powders using anodic oxidation and ultrasonication. Compared to free-standing NT array films, the powder-type NTs can be easily fabricated in a cost-effective way. Particularly, without the substrate effect arising from underlying Ti metals, highly crystallized NT powders with intact tube structures and pure anatase phase can be obtained using high-temperature heat treatment. The application of NTs with different crystallinity for the photocatalytic decomposition of methylene blue (MB) was then demonstrated. The results showed that with increasing annealing temperature, the photocatalytic decomposition rate was gradually enhanced, and the NT powder electrode annealed at 650°C showed the highest photoactivity. Compared to typical NTs annealed at 450°C, the rate constant increased by 2.7-fold, although the surface area was 21% lower. These findings indicate that the better photocatalytic activity was due to the significantly improved crystallinity of anatase anodic NTs in powder form, resulting in a low density of crystalline defects. This simple and efficient approach is applicable for scaled-up water purification and other light utilization applications.

Modified Titanium Dioxide for Photocatalytic Applications

“…The nanotitania crystallinity can simply be enhanced by optimizing the annealing temperature. However, the stability of the structure and geometries have to be considered when annealing [84]. For the nanotitania morphology and surface area, various ordered structures have been studied.…”

Insertion of lithium ion in anatase TiO 2 nanotube arrays of different morphology

“…The chemical diffusion coefficient of lithium ions was calculated for NTAs obtained at all anodization voltages. For electrode with 60V-TiO 2 NTs, which have the most accessible surface, by using specific surface area of 30 m 2 ·g -1 [35], the surface area of NTs was calculated to be ~77 cm 2 . By using the ratio of inclined parts of voltage profiles during discharge, Fig.…”

Recent advances in the use of TiO2 nanotube powder in biological, environmental, and energy applications

“…The rst approach is the anodization of Ti foil, which can be subdivided into two techniques. While the st approach includes the anodization of Ti foil followed by controlled ultrasonication, 14 the second technique is a one-step process known as rapid breakdown anodization. 15,16 The second approach is the hydrothermal synthesis of TNTP.…”