Combined modification of a TiO₂ photocatalyst with two different carbon forms

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• 作者：Alejandro Ansó ; n-Casaos ; ^{alanson@icb.csic.es} ; Ignacio Tacchini ; Andrea Unzue ; M. Teresa Martí ; nez
• 关键词：Titanium dioxide ; Nanorod ; Carbon nanotubes ; Nanocomposite ; Photocatalysis ; Visible
• 刊名：Applied Surface Science
• 出版年：2013
• 出版时间：1 April, 2013
• 年：2013
• 卷：270
• 期：Complete
• 页码：675-684
• 全文大小：1407 K

文摘

Hydrothermally synthesized titanate nanotubes were carbon-doped through a thermal treatment in the presence of glucose followed by blending with single-walled carbon nanotubes (SWCNTs). A series of TiO₂-based materials was prepared with various initial glucose contents and two SWCNT types, resulting in total carbon contents from 0.3 wt. % to nearly 26 wt. % . Electron microscopy observations indicated that titanate nanotubes were converted into nanorods during the thermal treatment, and X-ray diffraction patterns confirmed that all the treated materials mostly consisted of anatase TiO₂. Glucose pyrolysis caused changes in the infrared and X-ray photoelectron spectra of the titania material, indicating an interaction between the inserted carbon atoms and titanium atoms. Raman spectra of SWCNT/C/TiO₂ hybrids showed characteristic bands of both the SWCNT and anatase TiO₂ phases. SWCNT/C/TiO₂ multicomponent materials demonstrated substantially better photocatalytic activities than P25 TiO₂ for methylene blue degradation under visible light irradiation. Independently from its origin, the presence of carbon caused a strong increase in the TiO₂ visible light absorption. However, the results obtained with the C/TiO₂ and SWCNT/C/TiO₂ photocatalysts clearly showed different photocatalysis mechanisms depending on the carbon form.