Photocatalyzed N-de-methylation and degradation of crystal violet in titania dispersions under UV irradiation

Chiing Chang Chen; Fu Der Mai; Kung Tung Chen; Chia Wei Wu; Chung Shin Lu

doi:10.1016/j.dyepig.2006.06.040

Photocatalyzed N-de-methylation and degradation of crystal violet in titania dispersions under UV irradiation

Chiing Chang Chen, Fu Der Mai, Kung Tung Chen, Chia Wei Wu, Chung Shin Lu

Department of Biochemistry and Molecular Cell Biology

Research output: Contribution to journal › Article › peer-review

53 Citations (Scopus)

Abstract

TiO₂-mediated photocatalytic process has been successfully applied to degrade dye pollutants. In order to obtain a better understanding on the mechanistic details of the TiO₂-assisted photodegradation of crystal violet (CV, N,N,N′,N′,N″,N″-hexamethylpararosaniline) dye with UV irradiation, 17 intermediates of the process were separated, identified and characterized by HPLC-ESI-MS techniques in this study. The results indicated that the N-de-methylation degradation of CV dye took place in a stepwise manner to yield mono-, di-, tri-, tetra-, penta-, and hexa-N-de-methylated CV species with N-hydroxymethylated intermediates, which were found for the first time, generated during the processes. Several probable photodegradation pathways were proposed and discussed. The reaction mechanisms of TiO₂/UV proposed in this study would be useful for future application of this technology for decoloration of dyes.

Original language	English
Pages (from-to)	434-442
Number of pages	9
Journal	Dyes and Pigments
Volume	75
Issue number	2
DOIs	https://doi.org/10.1016/j.dyepig.2006.06.040
Publication status	Published - 2007

Keywords

Crystal violet
Dye
N-De-methylation
Photodegradation
TiO

ASJC Scopus subject areas

General Chemical Engineering
Process Chemistry and Technology

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10.1016/j.dyepig.2006.06.040

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title = "Photocatalyzed N-de-methylation and degradation of crystal violet in titania dispersions under UV irradiation",

abstract = "TiO2-mediated photocatalytic process has been successfully applied to degrade dye pollutants. In order to obtain a better understanding on the mechanistic details of the TiO2-assisted photodegradation of crystal violet (CV, N,N,N′,N′,N″,N″-hexamethylpararosaniline) dye with UV irradiation, 17 intermediates of the process were separated, identified and characterized by HPLC-ESI-MS techniques in this study. The results indicated that the N-de-methylation degradation of CV dye took place in a stepwise manner to yield mono-, di-, tri-, tetra-, penta-, and hexa-N-de-methylated CV species with N-hydroxymethylated intermediates, which were found for the first time, generated during the processes. Several probable photodegradation pathways were proposed and discussed. The reaction mechanisms of TiO2/UV proposed in this study would be useful for future application of this technology for decoloration of dyes.",

keywords = "Crystal violet, Dye, N-De-methylation, Photodegradation, TiO",

author = "Chen, {Chiing Chang} and Mai, {Fu Der} and Chen, {Kung Tung} and Wu, {Chia Wei} and Lu, {Chung Shin}",

year = "2007",

doi = "10.1016/j.dyepig.2006.06.040",

language = "English",

volume = "75",

pages = "434--442",

journal = "Dyes and Pigments",

issn = "0143-7208",

publisher = "Elsevier BV",

number = "2",

}

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T1 - Photocatalyzed N-de-methylation and degradation of crystal violet in titania dispersions under UV irradiation

AU - Chen, Chiing Chang

AU - Mai, Fu Der

AU - Chen, Kung Tung

AU - Wu, Chia Wei

AU - Lu, Chung Shin

PY - 2007

Y1 - 2007

N2 - TiO2-mediated photocatalytic process has been successfully applied to degrade dye pollutants. In order to obtain a better understanding on the mechanistic details of the TiO2-assisted photodegradation of crystal violet (CV, N,N,N′,N′,N″,N″-hexamethylpararosaniline) dye with UV irradiation, 17 intermediates of the process were separated, identified and characterized by HPLC-ESI-MS techniques in this study. The results indicated that the N-de-methylation degradation of CV dye took place in a stepwise manner to yield mono-, di-, tri-, tetra-, penta-, and hexa-N-de-methylated CV species with N-hydroxymethylated intermediates, which were found for the first time, generated during the processes. Several probable photodegradation pathways were proposed and discussed. The reaction mechanisms of TiO2/UV proposed in this study would be useful for future application of this technology for decoloration of dyes.

AB - TiO2-mediated photocatalytic process has been successfully applied to degrade dye pollutants. In order to obtain a better understanding on the mechanistic details of the TiO2-assisted photodegradation of crystal violet (CV, N,N,N′,N′,N″,N″-hexamethylpararosaniline) dye with UV irradiation, 17 intermediates of the process were separated, identified and characterized by HPLC-ESI-MS techniques in this study. The results indicated that the N-de-methylation degradation of CV dye took place in a stepwise manner to yield mono-, di-, tri-, tetra-, penta-, and hexa-N-de-methylated CV species with N-hydroxymethylated intermediates, which were found for the first time, generated during the processes. Several probable photodegradation pathways were proposed and discussed. The reaction mechanisms of TiO2/UV proposed in this study would be useful for future application of this technology for decoloration of dyes.

KW - Crystal violet

KW - Dye

KW - N-De-methylation

KW - Photodegradation

KW - TiO

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VL - 75

SP - 434

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JO - Dyes and Pigments

JF - Dyes and Pigments

IS - 2

ER -

Photocatalyzed N-de-methylation and degradation of crystal violet in titania dispersions under UV irradiation

Abstract

Keywords

ASJC Scopus subject areas

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