Effect of Cu and Zr Co-doped SiO₂ Nanoparticles on the Stability of Phases (Quartz-Tridymite-Cristobalite) and Degradation of Methyl Orange at High Temperature

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• 作者：Nasrollah Najibi Ilkhechi ; Behzad Koozegar Kaleji ; Mahdi Mozammel ; Nader Ghobadi
• 关键词：SiO2 nanopowders ; Sol–gel ; Degradation ; Cu/Zr dopant
• 刊名：Silicon
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：9
• 期：2
• 页码：293-299
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Inorganic Chemistry; Materials Science, general; Optics, Lasers, Photonics, Optical Devices; Environmental Chemistry;
• 出版者：Springer Netherlands
• ISSN：1876-9918
• 卷排序：9

文摘

SiO₂ nanoparticles doped by 10 mol% Zr and 10 mol% Cu were prepared via the sol-gel method in a controled process. The effects of doping and calcination temperature on the structural and photo-catalytic properties of SiO₂ nanopowders were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. The phases of cristobalite, quartz and tridymite were found at a calcinations temperature range of 800 to 1000 °C and only cristobalite phase was formed at a temperature of 1200 °C. The degradation of methyl orange was examined under visible light radiation indicating that the effect of doped elements (Zr, Cu) on SiO₂ reduces the band gap effectively.