Citation: Du Mengfan, Chen Qirong, Zou Yu, Yang Kaimeng, Hu Jianxin, Meng Xiangfu. Molten Salt Synthesis of TiO₂ Nanosheet with Rich Oxygen Vacancies and Its Photocatalytic Activity[J]. Chemistry, ;2020, 83(3): 232-239. shu

Molten Salt Synthesis of TiO₂ Nanosheet with Rich Oxygen Vacancies and Its Photocatalytic Activity

1.
Department of Chemistry, Capital Normal University, Beijing, 100048
2.
Beijing Academy of Science and Technology, Beijing Center for Physical and Chemical Analysis, Beijing, 100089

Corresponding author: Meng Xiangfu, xfmeng@cnu.edu.cn
Received Date: 25 November 2019
Accepted Date: 28 December 2019

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The positive effects of oxygen vacancy defects on the performance of semiconductor materials are attracting increasing attention. Herein, blue TiO₂ nanosheet with rich oxygen vacancies was successfully synthesized via a one-step molten salt method using the hydrolysis product of TiCl₄ in trifluoroacetic acid as a precursor. Due to the low oxygen partial pressure of the molten salt, the lattice oxygen of TiO₂ was consumed during calcination, leading to a large amount of oxygen vacancies and Ti³⁺. UV-Visible diffuse reflectance spectroscopy showed that the band gap of blue TiO₂ nanosheets was reduced to 2.69 eV, and the light adsorption range was extended from the ultraviolet region to the visible region. The as-prepared blue TiO₂ nanosheets exhibits excellent photocatalytic activity, and the photodegradation rate of rhodamine B is 47.3 times that of pure TiO₂ under full-spectrum light irradiation. At the same time, the formed lattice fluorine doping can effectively stabilize the oxygen vacancies and greatly improve the separation efficiency of the photogenerated carriers. This work provides a new insight for constructing oxygen vacancies in semiconductor oxide materials.
- Titanium dioxide,
- Molten salt,
- Oxygen vacancies,
- Defects,
- Photocatalytic activity
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Molten Salt Synthesis of TiO2 Nanosheet with Rich Oxygen Vacancies and Its Photocatalytic Activity

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通讯作者: 陈斌, bchen63@163.com

Molten Salt Synthesis of TiO₂ Nanosheet with Rich Oxygen Vacancies and Its Photocatalytic Activity