Photooxidative N-de-ethylation of anionic triarylmethane dye (sulfan blue) in titanium dioxide dispersions under UV irradiation

Chiing Chang Chen, Chung Shin Lu, Fu D. Mai, Chyan Syang Weng

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The TiO2-mediated photocatalysis process has been successfully applied to degradation of dye pollutants. Our results indicate that the TiO2 surface is negatively charged, and the sulfan blue (SB) adsorbs onto the TiO2 surface through the positive di-ethylamino groups while the TiO2 surface is positively charged and the SB adsorbs onto the TiO2 surface through the negative sulfonyl groups. In order to obtain a better understanding of the mechanistic details of this TiO2-assisted photodegradation of the SB dye with UV irradiation, five intermediates of the processes were separated, identified, and characterized by the HPLC-ESI-MS technique, which included a positive- and negative-ion mode. The results indicated that the N-de-ethylation process continues until the N-de-ethylated SB dye is completely formed. The probable photodegradation pathways were proposed and discussed. The reaction mechanisms of UV/TiO2 proposed in this study should be useful for future applications of the technology to the decolorization of dyes.

Original languageEnglish
Pages (from-to)1600-1607
Number of pages8
JournalJournal of Hazardous Materials
Volume137
Issue number3
DOIs
Publication statusPublished - Oct 11 2006
Externally publishedYes

Fingerprint

Dispersions
Titanium dioxide
dye
irradiation
Coloring Agents
Dyes
Irradiation
Photolysis
Photodegradation
photodegradation
Photocatalysis
Negative ions
Positive ions
High Pressure Liquid Chromatography
Ions
Technology
Degradation
degradation
patent blue violet
titanium dioxide

Keywords

  • Dye
  • N-de-ethylation
  • Sulfan blue
  • Triarylmethane
  • UV/TiO

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering

Cite this

Photooxidative N-de-ethylation of anionic triarylmethane dye (sulfan blue) in titanium dioxide dispersions under UV irradiation. / Chen, Chiing Chang; Lu, Chung Shin; Mai, Fu D.; Weng, Chyan Syang.

In: Journal of Hazardous Materials, Vol. 137, No. 3, 11.10.2006, p. 1600-1607.

Research output: Contribution to journalArticle

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AB - The TiO2-mediated photocatalysis process has been successfully applied to degradation of dye pollutants. Our results indicate that the TiO2 surface is negatively charged, and the sulfan blue (SB) adsorbs onto the TiO2 surface through the positive di-ethylamino groups while the TiO2 surface is positively charged and the SB adsorbs onto the TiO2 surface through the negative sulfonyl groups. In order to obtain a better understanding of the mechanistic details of this TiO2-assisted photodegradation of the SB dye with UV irradiation, five intermediates of the processes were separated, identified, and characterized by the HPLC-ESI-MS technique, which included a positive- and negative-ion mode. The results indicated that the N-de-ethylation process continues until the N-de-ethylated SB dye is completely formed. The probable photodegradation pathways were proposed and discussed. The reaction mechanisms of UV/TiO2 proposed in this study should be useful for future applications of the technology to the decolorization of dyes.

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