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Markedly Enhanced Surface Hydroxyl Groups of TiO₂ Nanoparticles with Superior Water-Dispersibility for Photocatalysis.


ABSTRACT: The benefits of increasing the number of surface hydroxyls on TiO₂ nanoparticles (NPs) are known for environmental and energy applications; however, the roles of the hydroxyl groups have not been characterized and distinguished. Herein, TiO₂ NPs with abundant surface hydroxyl groups were prepared using commercial titanium dioxide (ST-01) powder pretreated with alkaline hydrogen peroxide. Through this simple treatment, the pure anatase phase was retained with an average crystallite size of 5 nm and the surface hydroxyl group density was enhanced to 12.0 OH/nm², estimated by thermogravimetric analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Especially, this treatment increased the amounts of terminal hydroxyls five- to six-fold, which could raise the isoelectric point and the positive charges on the TiO₂ surface in water. The photocatalytic efficiency of the obtained TiO₂ NPs was investigated by the photodegradation of sulforhodamine B under visible light irradiation as a function of TiO₂ content, pH of solution, and initial dye concentration. The high surface hydroxyl group density of TiO₂ NPs can not only enhance water-dispersibility but also promote dye sensitization by generating more hydroxyl radicals.

SUBMITTER: Wu CY 

PROVIDER: S-EPMC5459044 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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Markedly Enhanced Surface Hydroxyl Groups of TiO₂ Nanoparticles with Superior Water-Dispersibility for Photocatalysis.

Wu Chung-Yi CY   Tu Kuan-Ju KJ   Deng Jin-Pei JP   Lo Yu-Shiu YS   Wu Chien-Hou CH  

Materials (Basel, Switzerland) 20170522 5


The benefits of increasing the number of surface hydroxyls on TiO₂ nanoparticles (NPs) are known for environmental and energy applications; however, the roles of the hydroxyl groups have not been characterized and distinguished. Herein, TiO₂ NPs with abundant surface hydroxyl groups were prepared using commercial titanium dioxide (ST-01) powder pretreated with alkaline hydrogen peroxide. Through this simple treatment, the pure anatase phase was retained with an average crystallite size of 5 nm a  ...[more]

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