Citation: ZHAO Wei-Rong, SHI Qiao-Meng, LIU Ying. Performance, Deactivation and Regeneration of SnO₂/TiO₂ Nanotube Composite Photocatalysts[J]. Acta Physico-Chimica Sinica, ;2014, 30(7): 1318-1324. doi: 10.3866/PKU.WHXB201404222 shu

Performance, Deactivation and Regeneration of SnO₂/TiO₂ Nanotube Composite Photocatalysts

1.
Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, P. R. China

Received Date: 26 January 2014
Available Online: 22 April 2014
Fund Project:

SnO₂/TiO₂ nanotube composite photocatalysts were synthesized by microwave-assisted hydrothermal and micro-emulsion methods. The photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM/EDX), and electrochemical techniques. Toluene was chosen as a model pollutant to evaluate the performance, deactivation, and regeneration behavior of the photocatalysts under ultraviolet (UV) and vacuum ultraviolet (VUV) irradiation. The results show that ternary heterojunctions of SnO₂/TiO₂ nanotube composite photocatalysts including anatase TiO₂ (A-TiO₂)/rutile TiO₂ (R-TiO₂), A-TiO₂/SnO₂, and R-TiO₂/SnO₂ were successfully created. They were able to separate photogenerated electron-hole pairs efficiently, and promote photocatalytic activity accordingly. SnO₂/TiO₂ showed the best photocatalytic performance. Under UV or VUV irradiation, the toluene degradation rate of SnO₂/TiO₂ was 100%, and the CO₂ formation rate (k₂) of SnO₂/TiO₂ was approximately 3 times higher than that of P25. Because of the low mineralization rate under UV irradiation, the refractory intermediates generated can occupy active photocatalytic sites on the photocatalyst surface, which hinders the photocatalytic oxidation rate. After 20 h of UV irradiation, the k₂ of SnO₂/TiO₂ decreased from 138.5 to 76.1 mg·m^-3·h^-1, implying that the photocatalysts can be deactivated quickly. VUV irradiation was employed to regenerate the deactivated SnO₂/SnO₂/TiO₂ nanotube composite photocatalysts were synthesized by microwave-assisted hydrothermal and micro-emulsion methods. The photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy with energy-dispersive X-ray spectroscopy (TEM/EDX), and electrochemical techniques. Toluene was chosen as a model pollutant to evaluate the performance, deactivation, and regeneration behavior of the photocatalysts under ultraviolet (UV) and vacuum ultraviolet (VUV) irradiation. The results show that ternary heterojunctions of SnO₂/TiO₂ nanotube composite photocatalysts including anatase TiO₂ (A-TiO₂)/rutile TiO₂ (R-TiO₂), A-TiO₂/SnO₂, and R-TiO₂/SnO₂ were successfully created. They were able to separate photogenerated electron-hole pairs efficiently, and promote photocatalytic activity accordingly. SnO₂/TiO₂ showed the best photocatalytic performance. Under UV or VUV irradiation, the toluene degradation rate of SnO₂/TiO₂ was 100%, and the CO₂ formation rate (k₂) of SnO₂/TiO₂ was approximately 3 times higher than that of P25. Because of the low mineralization rate under UV irradiation, the refractory intermediates generated can occupy active photocatalytic sites on the photocatalyst surface, which hinders the photocatalytic oxidation rate. After 20 h of UV irradiation, the k₂ of SnO₂/TiO₂ decreased from 138.5 to 76.1 mg·m^-3·h^-1, implying that the photocatalysts can be deactivated quickly. VUV irradiation was employed to regenerate the deactivated SnO₂/TiO₂ because reactive species such as ·OH, O₂^-·, O(¹D), O(³P), and O₃ can be generated. These play an important role in the oxidation of refractory intermediates on the photocatalyst surface, and k₂ increased to 143.6 mg·m^-3·h^-1 accordingly. Therefore, UV photodegradation combined with VUV regeneration could be a feasible photocatalytic process because of a synergistic effect between UV and VUV.
- Heterojunction,
- Vacuum ultraviolet,
- Toluene,
- Electron-hole pair,
- 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

Performance, Deactivation and Regeneration of SnO2/TiO2 Nanotube Composite Photocatalysts

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通讯作者: 陈斌, bchen63@163.com

Performance, Deactivation and Regeneration of SnO₂/TiO₂ Nanotube Composite Photocatalysts