Citation: Yanting Shi, Qiaoling Zhang, Youzhi Liu, Junbo Chang, Jing Guo. Preparation of amphiphilic TiO₂ Janus particles with highly enhanced photocatalytic activity[J]. Chinese Journal of Catalysis, ;2019, 40(5): 786-794. doi: S1872-2067(19)63332-2 shu

Preparation of amphiphilic TiO₂ Janus particles with highly enhanced photocatalytic activity

a Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, Shanxi, China;
b Shanxi North Xing'an Chemical Industry Co. Ltd, Taiyuan 030008, Shanxi, China

Received Date: 14 December 2018
Revised Date: 14 February 2019

Fund Project: The work was supported by the National Natural Science Foundation of China (21808214).

Stearic-acid-modified TiO₂ (STA-TiO₂) particles were prepared via the impregnation approach and used as a precursor for preparing TiO₂ Janus particles. The morphology, structure, and properties of the TiO₂ Janus particles were characterized using Fourier-transform infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, thermogravimetric analysis, fluorescence microscopy, high-resolution transmission electron microscopy, contact angle analysis, dynamic light scattering, biological microscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy measurements. The results show that TiO₂ Janus particles can be successfully prepared via toposelective surface modification. STA grafted on the surface of TiO₂ enhances its hydrophobicity, promotes charge separation, and improves its adsorption capacity for organic compounds. The TiO₂ Janus particles strongly adsorb on an oil-water interface to form a stable Pickering emulsion. The degradation rates of high-concentration kerosene and nitrobenzene wastewaters when the photocatalyst is pure TiO₂, STA-TiO₂, or TiO₂ Janus particles are discussed and compared. The degradation rates were determined using an ultraviolet-visible spectrophotometer. It was found that the Pickering emulsion stabilized by the TiO₂ Janus particles exhibited the best photocatalytic performance; these Janus particles show promising potential for catalytic application.
- Titanium dioxide,
- Pickering emulsion,
- Nanoparticles,
- Photocatalysis,
- Degradation
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通讯作者: 陈斌, bchen63@163.com

Preparation of amphiphilic TiO₂ Janus particles with highly enhanced photocatalytic activity