Photodegradation of benzothiazole ionic liquids catalyzed by titanium dioxide and silver-loaded titanium dioxide

doi:10.1016/j.cjche.2020.02.006

Abstract

Abstract: In recent years, ionic liquids (ILs) have been widely used in extraction, synthesis, electrochemistry and other fields. Meanwhile, the environmental impact of ILs has been attracting a lot of attention, and eco-friendly treatment for ILs is becoming a necessary subject. In this study, photocatalytic degradations of benzothiazole ILs catalyzed by titanium dioxide (TiO₂) and silver-loaded titanium dioxide (Ag/TiO₂) were studied for the first time. The degradation of benzothiazole hexafluorophosphate ([C₄Bth]PF₆) could reach more than 99% within 240 min with the catalysis of TiO₂. To improve catalytic efficiency, Ag/TiO₂ was synthesized and characterized by UV-Vis diffuse reflectance absorption spectra (DRS) and X-ray photoelectron spectroscopy (XPS). The degradation of[C₄Bth]PF₆ could reach more than 99% within 120 min in the degradation catalyzed by Ag/TiO₂. The photodegradation products of benzothiazole ILs are composed of inorganic substances or organic substances with simpler structures, which are easier to decompose and less toxic. The degradation system proposed by this study could provide a simple, green, safe, and economical method for the efficient treatment of benzothiazole ILs.

Key words: Photocatalysis, Degradation, Ionic liquid, Titanium dioxide

摘要： In recent years, ionic liquids (ILs) have been widely used in extraction, synthesis, electrochemistry and other fields. Meanwhile, the environmental impact of ILs has been attracting a lot of attention, and eco-friendly treatment for ILs is becoming a necessary subject. In this study, photocatalytic degradations of benzothiazole ILs catalyzed by titanium dioxide (TiO₂) and silver-loaded titanium dioxide (Ag/TiO₂) were studied for the first time. The degradation of benzothiazole hexafluorophosphate ([C₄Bth]PF₆) could reach more than 99% within 240 min with the catalysis of TiO₂. To improve catalytic efficiency, Ag/TiO₂ was synthesized and characterized by UV-Vis diffuse reflectance absorption spectra (DRS) and X-ray photoelectron spectroscopy (XPS). The degradation of[C₄Bth]PF₆ could reach more than 99% within 120 min in the degradation catalyzed by Ag/TiO₂. The photodegradation products of benzothiazole ILs are composed of inorganic substances or organic substances with simpler structures, which are easier to decompose and less toxic. The degradation system proposed by this study could provide a simple, green, safe, and economical method for the efficient treatment of benzothiazole ILs.

关键词: Photocatalysis, Degradation, Ionic liquid, Titanium dioxide

Jinghang Li, Huimin Zang, Shun Yao, Zicheng Li, Hang Song. Photodegradation of benzothiazole ionic liquids catalyzed by titanium dioxide and silver-loaded titanium dioxide[J]. Chinese Journal of Chemical Engineering, 2020, 28(5): 1397-1404.

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