Oxidative decomposition of volatile organic compounds using thermally-excited activity of hydroxyapatite

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• 作者：Harumitsu Nishikawa^a ; ^{nishikawa-harumitsu@pref.gifu.lg.jp} ; Takashi Oka^a ; Naoki Asai^b ; Hiroyuki Simomichi^b ; Takashi Shirai^c ; Masayoshi Fuji^c
• 关键词：Hydroxyapatite ; Volatile organic compounds ; Decomposition ; Thermally-excited activity ; Radical formation
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 May, 2012
• 卷：258
• 期：14
• 页码：5370-5374
• 文件大小：823 K

摘要

Oxidative decomposition of volatile organic compounds, i.e. toluene, on hydroxyapatite (HAp) under high temperatures was studied. Gaseous toluene, ethyl acetate and iso-propanol, decomposed oxidatively and converted to CO and CO₂ effectively at 400-500 掳C over stoichiometric or calcium-deficient HAp. From the direct measurement of ESR spectra under high temperatures, the ESR signals (g-value at around 2.003) for stoichiometric and calcium-deficient HAp under 300-400 掳C were assigned to the electron trapped on vacancy in HAp. Then, it was concluded that volatile organic compounds were decomposed by the active oxygen radical due to the electron trapped on vacancy in HAp under high temperatures. We propose that HAp has also thermally-excited activity similar to TiO_2.