Synthesis of Cu-doped nano-TiO₂ by detonation method

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• 作者：Honghao Yan ; Tiejun Zhao ; Xiaojie Li ; ^{923309973@qq.com" class="auth_mail" title="E-mail the corresponding author} ; Changhong Hun
• 关键词：Nano-TiO2 ; Detonation method ; Cu doping ; Photocatalysis
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：14204-14211
• 全文大小：1630 K

文摘

Cu-doped nano-TiO₂ was successfully prepared by detonating a mixture of metatitanic acid, cupric citrate, ethylene glycol, and hexogen with specific mass ratio in a closed container. The samples were characterized using an X-ray diffractometer (XRD), transmission electron microscope, high-resolution transmission electron microscope, energy dispersive x-ray spectrometer, UV–vis spectrophotometer, and FTIR spectrophotometer. Results showed that the samples comprising the mixed crystal of anatase and rutile were the most irregularly shaped particles, exhibiting poor dispersion. The 550 °C high-temperature heat treatment could improve the dispersion, with crystal size of 10–30 nm. The diffraction peak of the copper oxide appeared on the XRD pattern with the increase in Cu doping concentration. Cu doping could reduce the band gap of TiO₂ and enhance visible light absorption. New absorption peaks appeared on the infrared absorption spectrum of TiO₂ after Cu doping, and energy levels were observed in the energy gap of TiO₂. The photocatalytic properties of TiO₂ could be enhanced by increasing the Cu doping concentration. The initial concentration of methyl orange solution negatively correlated with the photocatalytic properties of TiO₂, whereas the degradation rate of methyl orange solution increased with increasing TiO₂ dosage. An almost linear relationship was observed between TiO₂ dosage and degradation rate. The concentration of the Cu-doped sample had a significant impact on the degradation rate of methyl orange solution.