Photocatalytic degradation of methylene blue on nanocrystalline TiO2: Surface mass spectrometry of reaction intermediates
作者： Hubert Gnaser , Michael R. Savina , Wallis F. Calaway , C. Emil Tripa , Igor V. Veryovkin
DOI: 10.1016/J.IJMS.2005.07.003
关键词:
摘要: Photocatalytic degradation reactions of methylene blue on nanocrystalline TiO2 (nc-TiO2) films were studied in situ by surface mass spectrometric techniques including secondary ion spectrometry, laser desorption direct and desorption/laser photoion spectrometry. The parent and/or its reduced form leucomethylene was observed with little fragmentation all methods prior to ultraviolet exposure. composition changed upon (UV) irradiation air, an observation ascribed photocatalytic induced UV photons: the molecule signal diminished intermediate reaction products such as sulfoxides sulfones detected from surface. After prolonged these species also vanished appeared be almost completely mineralized.
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