|
|||||
|
|
Experimental study for adsorption and photocatalytic reaction of ethyl methylphosphonate molecule as organophosphorus compound adsorbed at surface of titanium dioxide under UV irradiation in ambient condition |
|
| Authors: | Hirakawa Tsutomu Nishimoto Chifumi K Komano Asuka Otsuka Mai Negishi Nobuaki Miyaguchi Hajime Seto Yasuo Takeuchi Koji |
| Institution: | 1.National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki, 305-8569, Japan ;2.Center for Green Research On Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba Ibaraki, 305-0044, Japan ;3.RIKEN, SPring-8 Center, Forensic Science Group, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan ;4.National Research Institute of Police Science(NRIPS), 6-3-1 Kashiwanoha, Kashiwa-shi, Chiba, 277-0882, Japan ; |
| Abstract: | The adsorption and photocatalytic degradation of Ethyl methylphosphonate (EMPA) on powdery TiO2 film has experimentally investigated using attenuated total reflection-infrared Fourier transform spectroscopy (ATR-FTIR) in ambient condition. Characteristic IR frequency as P-O-C vibration mode as EtO was observed by EMPA adsorbed at the surface of TiO2. By TiO2 photocatalysis, the adsorbed EMPA was decomposed to methyl phosphonic acid and phosphoric acid. The increment of IR intensity of which is assigned to Ti–O-P-O-Ti of EMPA was accompanied with increasing the IR peak intensity assigned to MPA. About that, we suggest that the appearance of the Ti–O-P-O-Ti of EMPA by the TiO2 photocatalysis is regarded as acceleration of the hydrolysis of EMPA by the surface OH groups of TiO2. The plausible adsorption structure and the photocatalytic reaction mechanism of EMPA at the surface of TiO2 photocatalyst were elucidated. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |