Homogenous photocatalytic degradation of a disperse dye and its dye bath analogue by silicadodecatungstic acid

Idil Arslan-Alaton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

A new method for disperse dye decolourization using the photochemically active silicadodecatungstic acid (H4SiW12O40) + isopropanol (electron donor) redox system has been described. Results of a series of control experiments have indicated that the one-electron reduced form of the silicadodecatungstic acid, SiW12O5-40, was responsible for reductive cleavage of disperse dye as evidenced by photochemical heteropoly blue generation upon H4SiW12O40 + isopropanol UV-illumination. A threshold (0.09 mM) and an optimum (0.5 mM) heteropoly acid dose existed for minimum and maximum decolourization rates, respectively. It was also evident that decolourization kinetics were first-order with respect to dye concentration for concentrations up to 75 mg/l, and the photochemical degradation rate became UV-light penetration limited (zero order) above 100 mg/l dye concentration.

Original languageEnglish
Pages (from-to)167-176
Number of pages10
JournalDyes and Pigments
Volume60
Issue number2
DOIs
Publication statusPublished - Feb 2004

Keywords

  • Decolourization
  • Disperse dyes
  • H SiWO
  • Heteropoly acid
  • Heteropoly blue
  • Photochemical degradation

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