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Water-Catalyzed Low-Temperature Transformation from Amorphous to Semi-Crystalline Phase of Ordered Mesoporous Titania Framework

Abstract : In this paper, the phase transformation in water at low temperature from amorphous TiO2 to semi-crystalline anatase is reported. Our approach is an environmentally friendly low energy consumer process that requires no specific devices or instrumentation. The phase transition occurs even at room temperature. However, the higher the temperature is, the better the crystallinity is. Crystallization of amorphous titania occurs through a rearrangement of the TiO62- octahedral units in amorphous TiO2. The phase transformation is catalyzed by water, which adsorbs on the titania surface to form bridges between the surface OH groups of different octaedra. The obtained titania samples have been used for the photodegradation of methyl orange. Because of the formation of anatase, mesoporous TiO2 exhibits a photocatalytic activity after treatment in water. However, the activity is lower than that of the standard photocatalysts because the TiO2 treated during 1 h in water at 120 C has degraded 85% of methyl orange within 240 mm compared to 45 min for P25.
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Submitted on : Thursday, March 23, 2017 - 4:19:45 PM
Last modification on : Friday, February 26, 2021 - 3:24:02 PM

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Karine Assaker, Cedric Carteret, Bénédicte Lebeau, Claire Marichal, Loïc Vidal, et al.. Water-Catalyzed Low-Temperature Transformation from Amorphous to Semi-Crystalline Phase of Ordered Mesoporous Titania Framework. ACS Sustainable Chemistry & Engineering, American Chemical Society, 2014, 2 (2), pp.120-125. ⟨10.1021/sc400323w⟩. ⟨hal-01494555⟩

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