Abstract
We study in this work the interaction of the cationic dye toluidine blue (TB) with two oppositely charged polyelectrolytes: the hydrophobic polyanion poly (styrene-co-styrene sulfonate) (PSSNa) and the hydrophilic polycation poly (diallyl dimethylammonium chloride) (PDADMAC) in aqueous solution, for purpose of application in wastewater remediation by coagulation–flocculation or polyelectrolyte enhanced ultrafiltration. In this context and in order to optimize the process in conditions close to those of the industry, the effects of several intrinsic and extrinsic parameters on the interaction of TB with PSSNa and PDADMAC were investigated, such as the sulfonation degree f and the molecular weight of PSSNa, polyelectrolyte concentrations, NaCl addition, EtOH addition and temperature. By spectrophotometric study, it was first shown that the addition of cationic PDADMAC to TB-PSSNa complexes promotes the metachromasy, particularly under stoichiometric conditions, i.e. Z = \(\frac{[PDADMAC]}{[PSSNa]}\) = 1 and at optimum concentrations of polyelectrolytes, where insoluble PSSNa-TB-PDADMAC tri-component complexes confirmed by FTIR, were formed in free-salt aqueous solution, allowing a separation of TB from the supernatant by simple decantation. Moreover, the stability of the resulting tri component PSSNa-TB-PDADMAC system decreases with the sulfonation degree f decrease, the inorganic salt and the EtOH addition as well as a temperature increase, whereas it is insensitive to the molecular weight of the PSSNa. The best experimental parameters give retention rates exceeding 80%, highlighting the efficiency of this type of flocculation process, using two oppositely charged polyelectrolytes, for wastewater treatment.
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Acknowledgements
The Tunisian ministry of higher education and scientific research is acknowledged for allocating the Ph. D. research grant to N.J. We are grateful to Monia El Ouni for her technical support in Thermogravimetric Analysis.
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Jemili, N., Legros, M., Rawiso, M. et al. Enhanced Complexation of Toluidine Blue in Aqueous Solution with Two Oppositely Charged Polyelectrolytes: A Hydrophobic Polyanion ‘PSSNa’ and a Hydrophilic Polycation ‘PDADMAC’. Chemistry Africa 7, 1121–1139 (2024). https://doi.org/10.1007/s42250-023-00785-2
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DOI: https://doi.org/10.1007/s42250-023-00785-2