Characterization and photocatalytic activity of mixed nanocrystalline TiO₂ powders prepared by xerogel-hydrothermal method in different acid solutions

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• 作者：Cuiping Liu 刘翠萍 ; Tao Yu 于 涛 ; Xin Tan 谭 欣
• 关键词：TiO2 xerogel ; hydrothermal ; anatase
• 刊名：Transactions of Tianjin University
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：22
• 期：5
• 页码：473-479
• 全文大小：805 KB
• 刊物类别：Engineering
• 刊物主题：Chinese Library of Science
  
• 出版者：Tianjin University
• ISSN：1995-8196
• 卷排序：22

文摘

TiO₂ nanoparticles(NPs)were prepared via the hydrothermal route of TiO₂ xerogel in nitric acid, hydrochloric acid and acetic acid. The physico-chemical properties of the powders were characterized by X-ray diffraction(XRD)and N₂ adsorption desorption techniques. The effects of the different acids on the structure(crystal phase)and texture(primary particle size and porosity)of the TiO₂ powders were explored. Results indicated that acetic acid facilitated the formation and stability of pure anatase phase. On the other hand, nitric acid and hydrochloric acid led to the transformation from anatase to rutile. The catalyst synthesized via the hydrothermal route of TiO₂ xerogel in the low concentration hydrochloric acid solution(Ti-HCl-0.15)had the highest photocatalytic activity than the catalysts obtained in the other two acid solutions. The effects of the different acids were discussed in terms of acid strength, chelating effect and the thermal stability of the adsorbed acidic anions.