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http://dx.doi.org/10.4150/KPMI.2018.25.3.257

Photocatalytic activity of rutile TiO2 powders coupled with anatase TiO2 nanoparticles using surfactant  

Byun, Jong Min (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Park, Chun Woong (Department of Materials Science and Engineering, Hanyang University)
Kim, Young In (Department of Materials Science and Engineering, Hanyang University)
Kim, Young Do (Department of Materials Science and Engineering, Hanyang University)
Publication Information
Journal of Powder Materials / v.25, no.3, 2018 , pp. 257-262 More about this Journal
Abstract
The coupling of two semiconducting materials is an efficient method to improve photocatalytic activity via the suppression of recombination of electron-hole pairs. In particular, the coupling between two different phases of $TiO_2$, i.e., anatase and rutile, is particularly attractive for photocatalytic activity improvement of rutile $TiO_2$ because these coupled $TiO_2$ powders can retain the benefits of $TiO_2$, one of the best photocatalysts. In this study, anatase $TiO_2$ nanoparticles are synthesized and coupled on the surface of rutile $TiO_2$ powders using a microemulsion method and heat treatment. Triton X-100, as a surfactant, is used to suppress the aggregation of anatase $TiO_2$ nanoparticles and disperse anatase $TiO_2$ nanoparticles uniformly on the surface of rutile $TiO_2$ powders. Rutile $TiO_2$ powders coupled with anatase $TiO_2$ nanoparticles are successfully prepared. Additionally, we compare the photocatalytic activity of these rutile-anatase coupled $TiO_2$ powders under ultraviolet (UV) light and demonstrate that the reason for the improvement of photocatalytic activity is microstructural.
Keywords
Photocatalyst; Titanium dioxide; coupling effect; surfactant; Photocatalytic activity;
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