Control of Ti³⁺surface defect on TiO₂ nanocrystal using various calcination atmospheres as the first step for surface defect creation and its application in photocatalysis

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• 作者：Kongkiat Suriye ; Piyasan Praserthdam ; Bunjerd Jongsomjit
• 关键词：TiO₂ ; Surface defect controlling ; First step creation ; Calcination atmosphere ; Ti³⁺ ; Photocatalyst
• 刊名：Applied Surface Science
• 出版年：2007
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：15 February 2007
• 卷：253
• 期：8
• 页码：3849-3855
• 文件大小：566 K

摘要

A new development to create the surface defect (Ti³⁺) on TiO₂ was reported in this paper and compared to the common methods which must prepare the crystalline TiO₂ in the first step prior, and then create the surface defect in the second step. In this work, the surface defect creation was performed in the first step coinciding with the crystalline TiO₂ preparation using the sol–gel method. The creation was performed by varying the amounts of oxygen fed during calcination. Based on the CO₂-temperature programmed desorption (CO₂-TPD) and electron spin resonance (ESR) results, the surface defect (Ti³⁺) substantially increased with the amount of oxygen fed. Moreover, the samples resulting from calcination were used as photocatalysts for ethylene decomposition. The reactivity of those samples was also discussed.