Citation: CUI Hai-Qin, JING Li-Qiang, XIE Ming-Zheng, LI Zhi-Jun. Hydrogenated Rutile TiO₂ Nanorods and Their Photocatalytic Activity[J]. Acta Physico-Chimica Sinica, ;2014, 30(10): 1903-1908. doi: 10.3866/PKU.WHXB201407173 shu

Hydrogenated Rutile TiO₂ Nanorods and Their Photocatalytic Activity

1.
Key Laboratory of Functional Inorganic Materials Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, P. R. China

Received Date: 24 June 2014
Available Online: 17 July 2014
Fund Project:

TiO₂ rutile nanorods were successfully synthesized by a hydrochloric acid-modified hydrothermal process, using butyl titanate as the titanium source, followed by hydrogenation treatment. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis near infrared (NIR) diffuse reflection spectroscopy (UV- Vis- NIR DRS), electron paramagnetic resonance (EPR), surface photovoltage spectroscopy (SPS), and the photodegradation of gas-phase acetaldehyde and liquid-phase phenol to evaluate the photocatalytic activity of the catalysts. The results show that the photoresponse of TiO₂ gradually expands from the ultraviolet region to the visible and near-infrared regions upon increasing the hydrogenation time at high temperature. Its color changed from white to gray, and this is attributed to the introduction of Ti³⁺ defects and oxygen vacancies. Based on surface photovoltage spectroscopy responses and the amount of hydroxyl radicals produced, hydrogenation treatment promoted the photogenerated charge separation significantly. This is responsible for the improved photocatalytic degradation activity toward gasphase acetaldehyde and liquid-phase phenol under visible or ultraviolet irradiation. Therefore, a specific amount of defects and/or vacancies can induce new and appropriate surface states below the conduction band of the TiO₂ samples. However, if the amount of introduced defects or vacancies is too high, low-level surface states are produced and this is not favorable for photogenerated charge separation, and detrimental to photocatalytic reactions.
- TiO₂,
- Hydrogenation treatment,
- Defect,
- Photogenerated charge separation,
- Photocatalysis
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Hydrogenated Rutile TiO2 Nanorods and Their Photocatalytic Activity

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通讯作者: 陈斌, bchen63@163.com

Hydrogenated Rutile TiO₂ Nanorods and Their Photocatalytic Activity