A new series of polymers comprising four terpolymers was synthesized via Mannich polycondensation of benzene-1

4-diamine

formaldehyde and piperazine by varying the benzene-1

4-diamine and piperazine ratio. The new polyamines (labeled Dipip) were characterized using

13

C solid-state NMR

FT-IR

TGA

DSC

XRD

SEM and EDX. The adsorptive performances of the synthesized polymers for Erichrome Black T (EBT) uptake from aqueous solution were investigated under batch process. Equilibrium

kinetic

and thermodynamic studies were conducted to determine the influence of different operational parameters of the adsorption process. The two most promising polymers among the series show an excellent EBT removal efficiency of ~100% and ~95% with high adsorption capacities of 775 mg·g

-1

and 917 mg·g

-1

respectively at a meager dosage of 5 mg. The sorption of EBT on the polymers was well described by Redlich-Peterson Langmuir model while the kinetic studies indicate that pseudo-second order model was followed. For the thermodynamic studies

the negative DG and positive DH values obtained suggest a spontaneity of the sorption

process which was endothermic in nature. The results of reusability test of the resins were promising even at the fourth cycle

showcasing the potentials of the new polymers in dyes contaminated water treatment.