Degradation of Benzene over a Zinc Germanate Photocatalyst under Ambient Conditions

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• 作者：Jianhui Huang ; Xinchen Wang ; Yidong Hou ; Xiufang Chen ; Ling Wu ; Xianzhi Fu
• 刊名：Environmental Science & Technology
• 出版年：2008
• 出版时间：October 1, 2008
• 年：2008
• 卷：42
• 期：19
• 页码：7387-7391
• 全文大小：228K
• 年卷期：v.42,no.19(October 1, 2008)
• ISSN：1520-5851

文摘

A rod-shaped Zn₂GeO₄ photocatalyst has been successfully prepared by a surfactant-assisted hydrothermal method. The photocatalyst was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis, UV/vis, N₂ adsorption−desorption, and FTIR techniques. The photocatalytic activity of the sample was evaluated by the decomposition of benzene in the gas phase under UV light illumination and was compared with that of bulk Zn₂GeO₄, commercial titania (Degussa P25), and Pt/P25. The results revealed that the Zn₂GeO₄ nanorods had the best photocatalytic activity for mineralizing benzene to CO₂ among the catalysts examined. No obvious deactivation of Zn₂GeO₄ nanorods was observed during the prolonged operation of 140 h. It was found that the Zn₂GeO₄ was also more active and stable than TiO₂-based catalysts toward photocatalytic decomposition of other volatile aromatic pollutants (e.g., toluene and ethylbenzene).