Citation: Chu Wanyi, Tang Xiao, Li Zhen, Lin Jingcheng, Qian Jueshi. Influence Factors on the Microstructure of Ultrathin TiO₂ Nanosheets Synthesized by Liquid Phase Method[J]. Acta Chimica Sinica, ;2018, 76(7): 549-555. doi: 10.6023/A18030100 shu

Influence Factors on the Microstructure of Ultrathin TiO₂ Nanosheets Synthesized by Liquid Phase Method

Chu Wanyi ^a ,
Tang Xiao ^b ,
Li Zhen ^a ,
Lin Jingcheng ^b ,
Qian Jueshi ^a,,

a.
College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
b.
School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Corresponding author: Qian Jueshi, qianjueshi@163.com
Received Date: 15 March 2018
Available Online: 20 July 2018
Fund Project: Project supported by the National Natural Science Foundation of China (No. 51472037)the National Natural Science Foundation of China 51472037

Figures(9)

Synthesis of large scale ultrathin 2D structural TiO₂ is challenging and meaningful in many fields of science and technology, because of their larger surface area and higher electron-hole pairs separation efficiency. In this work, a "bottomup" method is used to synthesize the large-size ultrathin TiO₂ nanosheets at low temperature by liquid-phase. The mixture of tetrabutyl titanate and ethanol could hydrolyze in a dilute nitric acid solution with an ice-water bath and the obtained hydrolysates could peptize. After peptized, the hydrolysis products become to be very small TiO₂ nanoclusters and they form a two-dimensional network structure via the orientation bonding formed by hydrogen bond. Continue to be aged at low temperature, the crystallization degree of samples will increase, and the networks eventually turn into TiO₂ nanosheets. Effects of the concentration of nitric acid, ambient temperature and reactant concentration on the formation of two-dimensional structure TiO₂ are studied in this work. The transmission electron microscope (TEM), ultraviolet-visible (UV-Vis) absorbance spectra, X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FTIR) are used to analyze the morphology, microstructure and properties of the samples, and the experiment of photocatalytic reduction of Cr(Ⅵ) is conducted to observe the photocatalytic activity of samples as well as to verify the effects of system parameters on the microstructure of TiO₂ nanosheets. The results show that when the concentration of nitric acid is during 0.0217~0.0721 mol·L^-1, the anatase TiO₂ nanosheets that thinner than 1 nm could be obtained by peptizing and aging at 0~4℃. Excess nitric acid leads to crystalline and morphology transformation of TiO₂, but lower concentration of nitric acid could prolong the peptizing time; increasing the ambient temperature will undermine the formation of two-dimensional structure; improving the amount of ethanol in the reactant will be helpful to disperse the hydrolysis products, and promote the process of the peptizing and formation of the two-dimensional structure.
- TiO₂ clusters,
- TiO₂ nanosheets,
- low temperature synthesis,
- influence factors,
- photocatalytic activity
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沈阳化工大学材料科学与工程学院沈阳 110142

Influence Factors on the Microstructure of Ultrathin TiO2 Nanosheets Synthesized by Liquid Phase Method

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通讯作者: 陈斌, bchen63@163.com

Influence Factors on the Microstructure of Ultrathin TiO₂ Nanosheets Synthesized by Liquid Phase Method