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Title: New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating
Authors: Gong, Yichao
Wang, Dan Ping
Wu, Renbing
Gazi, Sarifuddin
Soo, Han Sen
Sritharan, Thirumany
Chen, Zhong
Keywords: Photocatalysis
P25 TiO2 Core-shell Nanoparticles
Issue Date: 2017
Source: Gong, Y., Wang, D. P., Wu, R., Gazi, S., Soo, H. S., Sritharan, T., & Chen, Z. (2017). New insights into the photocatalytic activity of 3-D core–shell P25@silica nanocomposites : impact of mesoporous coating. Dalton Transactions, 46(15), 4994-5002. doi:10.1039/C7DT00797C
Series/Report no.: Dalton Transactions
Abstract: In this report, a three-dimensional (3-D) network of core–shell TiO2 (P25)–mesoporous SiO2 (P25@mSiO2) nanocomposites was prepared via a controllable surfactant-assisted sol–gel method. The nanocomposites were investigated for photocatalytic reactions of organic dye degradation, water splitting, and CO2 reduction to understand the roles of the mSiO2 shell in these photocatalytic reactions. It was found that the mSiO2 shell accelerates the photodegradation of the organic dye, but dramatically reduces the photocatalytic activity of P25 in water splitting and CO2 reduction. The roles played by the mSiO2 shell in the photocatalytic reactions are summarized as: (1) effective prevention of agglomeration of P25 nanoparticles, (2) facilitating the transfer of uncharged photo-generated •OH radicals via the abundant –OH groups on the mesoporous surface, (3) provision of increased reaction sites between •OH radicals and dye molecules by its mesoporous nanostructure and large surface area, and (4) prevention of diffusion of the photo-generated charge carriers (photoelectrons and photoholes) because of its insulating nature.
ISSN: 1477-9226
DOI: 10.1039/C7DT00797C
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2017 Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Dalton Transactions, Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles
SPMS Journal Articles

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