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Comparing the contribution of visible-light irradiation, gold nanoparticles, and titania supports in photocatalytic nitroaromatic coupling and aromatic alcohol oxidation

Zhao, Jian; Ke, Xuebin; Liu, Hongwei; Huang, Yiming; Chen, Chao; Bo, Arixin; Sheng, Xianliang; Zhu, Huaiyong

Authors

Jian Zhao

Hongwei Liu

Yiming Huang

Chao Chen

Arixin Bo

Xianliang Sheng

Huaiyong Zhu

Abstract

Under visible-light irradiation, gold nanoparticles (Au NPs) supported by titania (TiO₂) nanofibers show excellent activity and high selectivity for both reductive coupling of nitroaromatics to corresponding azobenzene or azoxylbenzene and selective oxidation of aromatic alcohols to corresponding aldehydes. The Au NPs act as active centers mainly due to their localized surface plasmon resonance (LSPR) effect. They can effectively couple the photonic energy and thermal energy to enhance reaction efficiency. Visible-light irradiation has more influence on the reduction than on the oxidation, lowering the activation energy by 24.7 kJ mol⁻¹ and increasing the conversion rate by 88% for the reductive coupling, compared to merely 8.7 kJ mol⁻¹ and 46% for the oxidation. Furthermore, it is found that the conversion of nitroaromatics significantly depends on the particle size and specific surface area of supported Au NPs; and the catalyst on TiO₂(B) support outperforms that on anatase phase with preferable ability to activate oxygen. In contrast, for the selective oxidation, the effect of surface area is less prominent and Au NPs on anatase exhibit higher photo-catalytic activity than other TiO₂ phases. The catalysts can be recovered efficiently because the Au NPs stably attach to TiO₂ supports by forming a well-matched coherent interface observed via high-resolution TEM.

Journal Article Type Article
Publication Date Sep 16, 2016
Journal Particle & particle systems characterization
Print ISSN 0934-0866
Electronic ISSN 1521-4117
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 33
Issue 9
Pages 628-634
Institution Citation Zhao, J., Ke, X., Liu, H., Huang, Y., Chen, C., Bo, A., …Zhu, H. (2016). Comparing the contribution of visible-light irradiation, gold nanoparticles, and titania supports in photocatalytic nitroaromatic coupling and aromatic alcohol oxidation. Particle and Particle Systems Characterization, 33(9), 628-634. doi:10.1002/ppsc.201600049
DOI https://doi.org/10.1002/ppsc.201600049
Keywords Photocatalysis, Gold nanoparticles, Titania nanofibres, Nitroaromatic coupling, Alcohol oxidation, Visible light
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/ppsc.201600049/abstract
Copyright Statement ©2017 University of Hull
Additional Information Authors' accepted manuscript of article: Zhao, J., Ke, X., Liu, H., Huang, Y., Chen, C., Bo, A., Sheng, X. and Zhu, H. (2016), Comparing the Contribution of Visible-Light Irradiation, Gold Nanoparticles, and Titania Supports in Photocatalytic Nitroaromatic Coupling and Aromatic Alcohol Oxidation. Part. Part. Syst. Charact., 33: 628–634. doi:10.1002/ppsc.201600049

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