Developing a cost-effective synthesis of active iron oxide doped titania photocatalysts loaded with palladium, platinum or silver nanoparticles

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• 作者：M.H.H. Mahmoud^a ; ^b ; Adel A. Ismail^a ; ^{aismail@cmrdi.sci.eg} ; ^{adelali11@yahoo.com} ; M.M.S. Sanad^a
• 关键词：Ilmenite ore ; Industrial wastes ; Fe2O3&ndash ; TiO2 ; Photocatalysts ; UV and Visible-lights
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 April, 2012
• 卷：187
• 期：Complete
• 页码：96-103
• 文件大小：1151 K

摘要

The main aim of this work is to utilize available materials such as ilmenite ore (as a source of titanium and iron oxides) and industrial wastes (as sources of noble metals) for preparation of Fe₂O₃-TiO₂ photocatalysts. A template-free one-step hydrothermal method was applied for synthesis of Fe₂O₃-TiO₂ and its loaded Pd, Pt and Ag nanoparticles. The TEM results indicated that Fe₂O₃-TiO₂ and Pd, Pt and/or Ag nanoparticles, are partly in close contact. TiO₂ nanoparticles with an average diameter of about 10 nm are quite uniform in size and shape. Pd, Pt and Ag are well dispersed and exhibit diameters of about 5, 10 and 20 nm respectively. Also, TEM evinces that the framework of the highly crystalline mesoporous Fe₂O₃-TiO₂ is composed of aligned anatase phase grown along the [1 0 1]. The N₂ isotherms of the prepared Fe₂O₃-TiO₂ and its noble metals loaded were characteristic of mesoporous solids. The meso-Fe₂O₃-TiO₂ nanocomposites possess high surface area of 175 m² g^鈭? and large pore volumes of 0.28 cm³ g^鈭?. These values were reduced to 124-145 m² g^鈭? and 0.18-0.26 cm³ g^鈭?, respectively, as a result of loading of noble metals. Photocatalytic degradation of methylene blue (MB) under UV and visible-lights indicated that the meso-Fe₂O₃-TiO₂ exhibited more enhanced activity under UV and visible-lights compared with TiO₂ P-25. Addition of Ag to Fe₂O₃-TiO₂ the most promising catalytic activity toward MB degradation under visible light. However, photodegradation of the MB under UV light was enhanced by adding Pd to Fe₂O₃-TiO₂. Utilization of raw ores and spent materials to prepare such photocatalysts represents an attractive approach due to the reduction of the production cost for practical environmental application.