Spectrophotometric study of the interaction of methylene blue with poly(styrene-co-sodium styrene sulfonate)

Authors

  • Souha Ben Mahmoud Laboratoire Matériaux, Traitement et Analyse - Institut National de Recherche et d’Analyse Physico-Chimique, Pôle Technologique de Sidi Thabet, 2020 Sidi Thabet-Tunisia, and Institut National des sciences appliquées et technologie, INSAT, Centre Urbain Nord BP 676 - 1080 Tunis Cedex, Tunisia
  • Ahmed Hichem Hamzaoui Laboratoire de Valorisation des Matériaux Utiles - Centre National des Recherches en Sciences des Matériaux, BP 95, Hammam Lif 2050, Tunisie.
  • Wafa Essafi Laboratoire Matériaux, Traitement et Analyse - Institut National de Recherche et d’Analyse Physico-Chimique, Pôle Technologique de Sidi Thabet, 2020 Sidi Thabet-Tunisia

Abstract

The interaction of the cationic phenothiazine dye, the Methylene Blue (MB) with poly-(sodium styrene sulfonate)f–co-(styrene)1-f, (PSSNa f), has been investigated by spectrophotometric method. The polyelectrolyte induced metachromasy resulting in a blue shift of the absorption maxima of the dye, in agreement with the formation of dye H-aggregates. The stability of the PSSNa-MB complexes was studied as a function of polyelectrolyte chain length, polyelectrolyte electrostatic charge density f, polyelectrolyte concentration, NaCl salt addition, tetrahydrofurane (THF) addition and THF treatment. The stoichiometry of PSSNa-MB complex evaluated by the molar ratio method was found 4:1 for the fully charged PSSNa f = 1. Reversal of metachromasy was observed upon salt and THF addition, while THF treatment does not affect the complex and allows recovering the initial complex. Finally, thermodynamic parameters of the interaction between the polyelectrolyte and the dye at different temperatures, namely free energy DG, the enthalpy DH and the entropy DS have been evaluated to determine the binding constant and as a consequence the stability of the complex. The metachromasy effect was found to be more high as the chemical charge f increases and reaches its maximum value f = 1, when operating at optimal conditions. So, the PSSNa f = 1-MB complex is the most stable in comparison to the others based on lower charge density PSSNa f.

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Published

2016-05-19

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Environmental Chemistry