Titanium dioxide photocatalytic decomposition of ethyl-S-dimethylaminoethyl methylphosphonothiolate (VX) in aqueous phase

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• 作者：Asuka Komano^b ; Tsutomu Hirakawa^a ; ^{t-hirakawa@aist.go.jp} ; Keita Sato^b ; Shintarou Kishi^b ; Chifumi K. Nishimoto^a ; Nobuaki Mera^a ; Masahiro Kugishima^c ; Taizo Sano^a ; Nobuaki Negishi^a ; Hiromichi Ichinose^c ; Yasuo Seto^b ; Koji Takeuchi^a
• 关键词：TiO2 ; Photocatalysis ; VX ; DMMP ; CWA ; Decontamination
• 刊名：Applied Catalysis B: Environmental
• 出版年：2013
• 出版时间：2 May, 2013
• 年：2013
• 卷：134-135
• 期：Complete
• 页码：19-25
• 全文大小：943 K

文摘

The TiO₂ photocatalytic decomposition of ethyl-S-dimethylaminoethyl methylphosphonothiolate (VX) as a real chemical warfare agent (CWA) in liquid phase has been investigated by gas chromatography/mass spectrometry (GC/MS) and liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. The TiO₂ photocatalytic decomposition rate, r_VX, was accelerated with increase in alkalinity. The several kinds of by-products such as diisopropylamine, ethyl methylphosphonic acid, oxygenated VX and partially oxidized VX were observed. On the basis of the by-products, the TiO₂ photocatalysis were proposed as the P-S, C-N cleavage and oxygenation of VX molecule carried out mainly. The difference between r_VX and vaporized dimethyl methylphosphonate (DMMP), r_DMMP as CWA simulant was also investigated and the r_VX was 30 times faster than the r_DMMP. On the basis of the decomposition mechanism of VX and DMMP molecules, the results of the acceleration of r_VX in alkaline condition and of the comparison of r_VX and r_DMMP were also discussed.