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Effects of ion exchange and calcinations on the structure and photocatalytic activity of hydrothermally prepared titanate nanotubes

Title
Effects of ion exchange and calcinations on the structure and photocatalytic activity of hydrothermally prepared titanate nanotubes
Authors
Kim, M.Hwang, S. -H.Lim, S. K.Kim, S.
DGIST Authors
Hwang, S. -H.Lim, S. K.Kim, S.
Issue Date
2012-11
Citation
Crystal Research and Technology, 47(11), 1190-1194
Type
Article
Article Type
Article
Keywords
Acid TreatmentsAnatase PhaseCalcinationCalcination TemperatureCrystallinitiesCrystallinityDistilled WaterHydrothermal ProcessHydrothermal ProcessingHydrothermallyIon ExchangeMesoporous MaterialsNanotubespH ValuePhoto-CatalyticPhoto-Catalytic ActivitiesPhoto-Catalytic ActivityPhotocatalysisPreparation ConditionsProduction RatesSodiumTiOTitanateTitanate NanotubesTitania PhaseTitanium DioxideWashing ProcessWeak Acids
ISSN
1521-4079
Abstract
Titanate nanotubes (TiNTs) were prepared by alkaline hydrothermal processing. The TiNTs are thermodynamically unstable and easily transformed to the titania phase by heat or acid treatment. These phase transformations are affected by the preparation conditions. In this study, we investigated the effects of using the washing process to modify the sodium content of the TiNTs. After an alkaline hydrothermal process was used to prepare the TiNTs, the resulting suspensions were washed with weak acid solution and distilled water until the pH value of the wash solution reached approximately 1 or 7, and the products were identified as H-TiNTs or Na-TiNTs, respectively. The characteristics and photocatalytic activities of the H-TiNTs and Na-TiNTs were compared for various calcination temperatures. The H-TiNTs were transformed completely to anatase-type TiO 2 by dehydration during calcination, while the crystallinity of the Na-TiNTs increased with calcination temperature. However, the photocatalytic H 2 production rates on calcined H-TiNTs were much higher than on Na-TiNTs, which could be attributed to the crystalline anatase phase. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
URI
http://hdl.handle.net/20.500.11750/5347
DOI
10.1002/crat.201200290
Publisher
Wiley-VCH Verlag
Related Researcher
Files:
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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