Photocatalytic degradation of phenol using doped titania supported on photonic SiO₂ spheres

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• 作者：Keyla M. Fuentes ; Paulino Betancourt…
• 关键词：Photonic SiO2 spheres ; Co ; doped TiO2 ; Grain boundaries ; Phenol degradation ; Visible light
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：120
• 期：1
• 页码：403-415
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Industrial Chemistry/Chemical Engineering;
• 出版者：Springer Netherlands
• ISSN：1878-5204
• 卷排序：120

文摘

The photocatalytic degradation of phenol in aqueous suspensions of co-doped TiO₂ supported on SiO₂ spheres was investigated. A novel photocatalyst was prepared combining iron doped TiO₂–SiO₂ and reduced TiO₂–SiO₂ by mechanical milling (MM/TiO₂–SiO₂). All the particles were characterized by BET. nitrogen adsorption, X-ray diffraction, scanning electron microscopy, UV–visible spectroscopy and elemental analysis. Trough XRD patterns it was calculated that 2 nm rutile crystallites were formed onto SiO₂ surface, ICP analysis confirmed Ti content near to nominal, while EDX analysis shows a surface content 10 lower, suggesting that the SiO₂ limiting the agglomeration of TiO₂ particles allowing a good dispersion. Phenol photodegradation was induced by illuminating the coated spheres in aqueous solution with a visible light source. The synthesized TiO₂–SiO₂ particles appeared to be 1.3 times more efficient in the phenol conversion, as compared to pure rutile particles. According to characterization results, this improvement could be attributed mainly to three factors: an effective transference of charge carriers trough the grain boundaries present between contact points, a photonic behavior evidenced on an increment on UV–vis absorption intensity and the quantum size effect of rutile crystallites coated on SiO₂.