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Study of the Direct Red 81 Dye/Copper(II)-Phenanthroline System.

Elsa Walger1, Nathalie Marlin2, Florian Molton3

  • 1Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, 461 rue de la Papeterie-CS 10065, 38402 Saint Martin d'Hères Cedex, F-38000 Grenoble, France. elsa.walger@lgp2.grenoble-inp.fr.

Molecules (Basel, Switzerland)
|January 26, 2018
PubMed
Summary

Copper(II)-phenanthroline complexes show a color-stripping effect on the azo dye Direct Red 81. This coordination phenomenon offers potential for wastewater treatment in the paper and textile industries.

Keywords:
Direct Red 81 azo dyeEPR spectroscopyUV-vis spectroscopycolor-strippingcoordinationcopper(II)-phenanthrolinespeciation simulation

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Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Industrial Chemistry

Background:

  • Recycled paper production requires decolorization of chromophores like lignin and dyes.
  • Hydrogen peroxide is effective for lignin but limited for dyes.
  • Copper(II)-phenanthroline (Cu-Phen) complexes can enhance hydrogen peroxide's oxidative capabilities.

Purpose of the Study:

  • To investigate the effect of Cu-Phen complexes on the azo dye Direct Red 81 (DR81).
  • To explore the potential of Cu-Phen for decolorizing dyes in aqueous solutions.

Main Methods:

  • Preparation of various Cu-Phen solutions with different molar ratios.
  • Mixing solutions with DR81 dye at varying pH levels.
  • Utilizing the PHREEQC program for speciation calculations.
  • UV-vis spectroscopy to correlate absorbance with theoretical species distribution.

Main Results:

  • Cu-Phen complexes reduced the color intensity of DR81 aqueous solutions, particularly at pH 10.7 with a 1:1 Cu:Phen ratio.
  • A coordination phenomenon between DR81 and Cu-Phen was identified as the likely cause.
  • The DR81 dye molecule acts as a competitor in ligand exchange with phenanthroline and hydroxide ions.

Conclusions:

  • Cu-Phen complexes exhibit a novel "color-stripping effect" on azo dyes through complex formation.
  • This effect presents a potential new method for wastewater treatment in the paper and textile industries.
  • Further research into this coordination phenomenon could optimize dye removal processes.