Effect of quenching medium on photocatalytic activity of nano-TiO₂ prepared by solvothermal method

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• 作者：Piyawat Supphasrirongjaroen ; Piyasan Praserthdam ; Joongjai Panpranot ; Duangkamol Na-Ranong ; Okorn Mekasuw ; umrong
• 关键词：Titanium dioxide ; TiO₂ ; Photocatalyst ; Solvothermal ; Ethylene decomposition ; Quenching ; Defects
• 刊名：Chemical Engineering Journal
• 出版年：2008
• 期刊代码：16_13858947
• 类别：ce
• 出版时间：1 May 2008
• 卷：138
• 期：1-3
• 页码：622-627
• 文件大小：510 K

摘要

Pure anatase nano-TiO₂ powders were synthesized by solvothermal method using titanium butoxide as the precursor and were subjected to a rapid quenching in various media such as H₂O, H₂O₂, air, and liquid N₂ as a post-synthesis treatment. By creating a thermal shock effect, quenching process has shown to be an easy novel route for modifying surface defects of the nano-TiO₂ and its photocatalytic activity. In this study, the TiO₂ sample quenched in air at 77 K contained the highest amount of Ti³⁺ surface defect with the highest Ti³⁺/OH and was found to exhibit the highest photocatalytic activity for ethylene decomposition.