Oxidation of phenols by TiO2-Fe3O4-M (M = Ag or Au) hybrid composites under visible light

被引：32

作者：

Aguilar, C. A. Huerta ^{[1
]}

Pandiyan, T. ^{[1
]}

Arenas-Alatorre, J. A. ^{[2
]}

Singh, Narinder ^{[3
]}

机构：

[1] Univ Nacl Autonoma Mexico, Fac Quim, Mexico City 04510, DF, Mexico

[2] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 04510, DF, Mexico

[3] IIT, Dept Chem, Ropar, Punjab, India

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2015年 / 149卷

关键词：

TiO2-Fe3O4-M; (M; Ag; or Au) composites; Visible light-photocatalyst; Phenol oxidation; OFF; DOPED TIO2 NANOPARTICLES; SOL-GEL METHOD; PHOTOCATALYTIC ACTIVITY; GOLD NANOPARTICLES; TITANIUM-DIOXIDE; OPTICAL-PROPERTIES; ELECTRON-TRANSFER; CHLORINE DIOXIDE; SUPPORTED GOLD; METHYL-ORANGE;

D O I：

10.1016/j.seppur.2015.05.019

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

TiO2 and its hybrid TiO2-Fe3O4 NPs were prepared, and doped with Ag, or Au NPs to yield TiO2-Fe3O4-Ag NPs and TiO2-Fe3O4-Au NPs. The photo-catalytic oxidation of phenols by the above materials were analyzed under both solar and UV light. For TiO2-Fe3O4-Ag NPs and TiO2-Fe3O4-Au NPs considerable visible light photo-oxidation was observed, while for other nano-materials UV-light energy required. The materials having Fe3O4 were reused after isolation by magnets. The oxidation rate decreases from phenol to 2,4,6-trichlorophenol in agreement with the Hammett plot, and follows first order kinetics in the substrate, for which a possible mechanism is proposed. The effect of pH, and solvents were also analyzed in the oxidation. To further support our kinetics experiments, Density functional theory (DFT) calculation were performed to predict the rate limiting step of phenol oxidation to yield benzoquinone. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：265 / 278

页数：14

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