Preparation and photocatalytic activity of rutile TiO₂ and goethite composite photocatalysts

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• 作者：Weimiao XIE ; Hui CHEN ; Xuanhui ZHANG ; Xianchao HU ; Guohua LI
• 关键词：Titanium dioxide ; Goethite ; Composite material ; Photocatalytic activity ; Methyl orange
• 刊名：Chinese Journal of Catalysis
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：34
• 期：6
• 页码：1076-1086
• 全文大小：2633 K

文摘

Rutile TiO₂ and goethite (¦Á-FeOOH) composite photocatalysts were fabricated by hydrolysis and precipitation using titanium tetrachloride as a precursor and ¦Á-FeOOH as a support. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The results show that at lower temperature, rutile TiO₂ particles coat on the surface of ¦Á-FeOOH particles to form rutile TiO₂-¦Á-FeOOH composite photocatalyst. At higher temperature, iron ions are doped into the rutile TiO₂ lattice to form iron-doped rutile TiO₂ tubes; at medium temperature, the sample is a mixture with both composite and iron-doped structures. The photocatalytic activity of the samples is estimated by their ability to degrade methyl orange under irradiation with ultraviolet-visible light (200-800 nm) at ambient temperature. The photocatalytic activities of the samples are improved compared with that of pure rutile TiO₂ and ¦Á-FeOOH. The sample containing a mixture of composite and iron-doped structures shows the highest photocatalytic activity of that investigated. As a result, the photocatalytic activity of Ti₂O could be improved effectively by combining with ¦Á-FeOOH or doping iron.