Preparation of amphiphilic TiO2 Janus particles with highly enhanced photocatalytic activity

doi:10.1016/S1872-2067(19)63332-2

Abstract

Abstract:

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.

Key words: Titanium dioxide, Pickering emulsion, Nanoparticles, Photocatalysis, Degradation

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63332-2

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Preparation of amphiphilic TiO₂ Janus particles with highly enhanced photocatalytic activity

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