Research Publications (Water and Wastewater Technology)

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Synthesis and performance evaluation of a new polymeric composite for the treatment of textile wastewater
(ACS Publications, 2015) Gupta, Sanjay Kumar; Nayunigari, Mithil Kumar; Misra, Rohit; Ansari, Faiz Ahmad; Dionysiou, Dionysios (Dion) D.; Maity, Arjun; Bux, Faizal
Azo dyes are synthetic colorants widely used in textile industry and are considered to be major contaminants in dye wastewater. Coagulation−ﬂocculation is most preferred techniques to treat dye wastewater. A N,N-diisopropylamine-based new polymer was synthesized by polycondensation of epichlorohydrin, N,N-diisopropylamine, and ethylinediamine. The chemical and thermal properties of the polymer were investigated by FTIR, XRD, TGA, and viscosity measurements. The ﬂocculation eﬃciency of the polymer was evaluated at diﬀerent coagulant dose, organic load, and pH. The ﬂocculation eﬃciency of this polymer was found to be higher over a pH range of 2−10 at its optimal dose of 80 mg/L. Morphological changes in the ﬂoc were studied by light and scanning electron microscopy. The zeta potential results clearly indicated that ﬂocculation at the optimum doses is the result of charge neutralization and adsorption bridging. This study demonstrates the successful synthesis of the polymer, its excellent color removal eﬃciency (>98%) at lower doses, and eﬀectiveness in dye wastewater treatment.