Mechanisms of photocatalytic degradation of Victoria Blue R using nano-TiO2

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TMUIR > College of Medicine > Department of Medicine > Department of Biochemistry and Molecular Cell Biology > Periodical Article > Item 987654321/3025

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Title:	Mechanisms of photocatalytic degradation of Victoria Blue R using nano-TiO2
Authors:	麥富德 Mai FD;Lu CS;Wu CW;Huang CH;Chen JY;Chen CC
Contributors:	醫學系生化學科
Date:	2008
Issue Date:	2009-08-21 16:33:53 (UTC+8)
Abstract:	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. Keywords: Victoria Blue R; Dye; Photocatalytic; Nano-TiO2; HPLC–PDA–ESI-MS
Relation:	Separation and Purification Technology.(62):424-437.
Data Type:	article
Appears in Collections:	[Department of Biochemistry and Molecular Cell Biology] Periodical Article

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