New route to synthesize highly active nanocrystalline sulfated titania-silica: synergic effects between sulfate species and silica in enhancing the photocatalysis efficiency

The Journal of Physical Chemistry. B
Chao XieYaoguo Du

Abstract

A simple and efficient approach has been set up for fabricating highly active sulfated titania-silica (SO(4)(2-)/TiO(2)-SiO(2)): Ti(SO(4))(2) was hydrolyzed in the presence of silica, making it possible to sulfate titania and form titania-silica mixed oxide in one step. This study was focused on investigating the roles of sulfate species and silica in improving the physicochemical properties and photoactivity of SO(4)(2-)/TiO(2)-SiO(2) through comparison with sulfated titania (SO(4)(2-)/TiO(2)) and sulfate-free catalysts (TiO(2) and TiO(2)-SiO(2)). Various characterization methods, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and surface photovoltage spectroscopy (SPS), were employed to test these materials. The results revealed that for SO(4)(2-)/TiO(2) and TiO(2)-SiO(2) the sole presence of either sulfate species or silica imposes negative effects on the photocatalysis behavior of titania, leading them to have negligible photoactivities. On the contrary, in the case of SO(4)(2-)/TiO(2)-SiO(2), sulfate species and silica were proved to act in a cooperative manner; therefore, the following enhanced structure and surface properties of SO(4)(2-)/TiO(2)...Continue Reading

References

Jul 9, 1999·Journal of Colloid and Interface Science·K M ParidaH K Mishra
Mar 29, 2005·Nano Letters·Gopal K MorCraig A Grimes
Jul 21, 2006·The Journal of Physical Chemistry. B·Qiujing YangYaoguo Du

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Citations

Jan 21, 2012·ACS Applied Materials & Interfaces·Baojuan XiHua Chun Zeng
Jun 2, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Xiangcun LiJayashri Sarkar

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