New Calix[4]arene Appended Amberlite XAD-4 Resin with Versatile Perchlorate Removal Efficiency

Perchlorate removal from an aqueous environment was carried out by newly synthesized 25,27-bis-( N, N -dimethyl-2-aminoethyl)carbonylmethoxy-26,28-dihydroxycalix[4]arene appended Amberlite XAD-4 resin (Resin- 5 ). Different parameters such as pH, dosage, concentration, interference, equilibrium isotherms, kinetics, and thermodynamics were explored. Experimental data were treated using equilibrium models such as Freundlich, Langmuir, and the Dubinin–Radushkevich (D–R) model, with determination of each characteristic parameter of isotherm. The adsorption mechanism was investigated by Reichenberg (R–B) and Morris-Webster equations, and it is concluded that the adsorption process is endothermic and spontaneous in nature at higher temperature. The kinetic adsorption experiments show that the adsorption process follows pseudo-second-order kinetics. The results show that newly synthesized resin has capability to efficiently remove perchlorate from aqueous media.