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Synthesis and photocatalytic activity of TiO2 nanoparticles fluorine-modified with TiF4

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Fluorine-modified TiO2 nanoparticles were synthesized by introducing TiF4 as a fluorine source either before or after the sufficient hydrolysis and condensation of Ti(OEt)4. The photocatalytic activity of the fluorine-modified catalysts was found to be greatly affected by the fluorine position in TiO2 nanoparticles. When TiF4 and Ti(OEt)4 hydrolyzed with synchronization, the fluorine tended to be doped in the lattice. The formation of Ti3+ defects could result in charge recombination in bulk and bring down the photocatalytic activity. In contrast, if TiF4 was introduced after the sufficient hydrolysis and condensation of Ti(OEt)4, Ti–F bonds could exist mainly on the TiO2 particles surface, which not only prevented the growth of anatase crystals but also facilitated the transfer of organic compounds from solution to catalyst surface by reducing the hydrophilic properties.

Affiliations: 1: Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan; 2: Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan;, Email: yamashita@mat.eng.osaka-u.ac.jp

10.1163/156856708784040687
/content/journals/10.1163/156856708784040687
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/content/journals/10.1163/156856708784040687
2008-04-01
2016-12-08

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