الفهرس 
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Abstract
The adsorption of indigo dye onto methylmethacrylate/sodium-Y-Zeolite and amidoximated acrylonitrile / Na-Y-Zeolite composites has been evaluated in aqoueous solutions. Different parameters namely, contact time, pH of solution, adsorbent dosage and thermal effect were examined. Two sorption isotherms namely, Langmuir and Freundlich isotherms had been utilized for describing equilibria isotherm. Evaluation of the activating energy of sorption was carried out regarding sorption of indigo dye on both composites. Kinetics of the sorption model were studied. Regarding both composites, the pseudo-second order kinetics imitation was suitable and is consistent with the practically obtained information. The activation energy (Ea), the standard free Gibbs energy (∆G), enthalpy (∆H) and entropy (∆S) of sorption methodology had been determined regarding the sorption of the indigo dye via both composites. The thermodynamics of the sorption proved that the process regarding both composites had been both spontaneously and endothermically happening. The practically obtained information indicated that both of methylmethacrylate/sodium-Y-Zeolite composite and amidoximated polyacrylonitrile/sodium-Y-Zeolite composite might serve well as inexpensive, efficient and reproducible adsorbents to remove indigo dyes from wastewaters.