کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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643175 | 884359 | 2008 | 14 صفحه PDF | دانلود رایگان |
The TiO2-mediated photocatalysis process was used to successfully degrade dye pollutants. To better understand the mechanistic details of this TiO2-assisted photodegradation of the Victoria Blue R (VBR) dye with UV irradiation, forty-four intermediates of the process were separated, identified and characterized by HPLC–PDA–ESI-MS (high performance liquid chromatography–photodiode array–electrospray ionization-mass spectrometry) technique in this study, and their evolution during the photocatalytic reaction is presented. The results indicated that the N-de-alkylation degradation of VBR dye took place in a stepwise manner to yield mono-, di-, tri-, tetra-, penta-, hexa-N-de-methylated and mono-N-de-ethylated VBR species, with N-hydroxyalkylated intermediates generated during the process. Moreover, the oxidative degradation yielded 4-diethylaminophenol, 4-diethylamino-4′-diethylaminobenzophenone, 4-(N,N-dimethylaminophenyl)-4′-(N′-ethylaminonaphthyl)ketone, 4-(N-ethylamino)naphthenol and their N-de-alkylated products. The reaction mechanisms of TiO2/UV proposed in this study should be useful for future application of the technology to the degradation of dyes.
Journal: Separation and Purification Technology - Volume 62, Issue 2, 1 September 2008, Pages 423–436