Aerosol-assisted fabrication of mesoporous titania spheres with crystallized anatase structures and investigation of their photocatalitic properties |
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Authors: | Hamid Oveisi Norihiro Suzuki Ali Beitollahi Yusuke Yamauchi |
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Institution: | (1) World Premier International (WPI) Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan;(2) Center of Excellence in Advanced Materials and Processing, Department of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, 16844, Iran;(3) Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi 332-0012, Saitama, Japan; |
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Abstract: | We demonstrate practical aerosol-assisted approach to synthesize spherical mesoporous titania particles with high surface
areas. Scanning electron microscopy observation of the spray-dried products clearly shows spherical morphology. To remove
surfactants and enhance crystallinity, the spray-dried products are calcined under various temperatures. The crystalline structures
inside the particles are carefully detected by wide-angle XRD measurements. With increase of the calcination temperatures,
anatase crystal growth proceeds and transformation from anatase to rutile is occurred. The effect of various calcination temperatures
on the mesostructures is also studied by using N2 adsorption desorption isotherms. The mesoporous titania particles calcined at 350, 400, and 500 °C exhibit type IV isotherms
with a capillary condensation step and shows a hysteresis loop, which is a characteristic of mesoporous materials. The reduction
in the surface areas and the pore volumes is confirmed by increasing the calcination temperatures, while the average pore
diameters are increased gradually. This is attributed to the distortion of the mesostructures due to the grain growth of the
anatase phase and the transformation to the rutile phase during the calcination process. As a preliminary experimental photocatalytic
activity, oxidative decomposition of acetaldehyde under UV irradiation is examined. The mesoporous titania calcined at 400 °C
shows the highest photocatalytic activity, due to both high surface area and well-developed anatase crystalline phase. |
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