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The adsorption of aqueous solution was carried out using zeolites synthesized from fly ashes as low-cost adsorbents. The fly ashes samples were converted to zeolites ZM and ZC by hydrothermal treatment using different synthesis parameters. The materials were characterized by physical-chemical analysis and XFR and XDR studies. The adsorption kinetics and isotherms were studied. It was found that the sufficient time to attain equilibrium was 1200 min for both adsorbents. The adsorption isotherms can be fitted by Langmuir model with maximum adsorption capacity of 7.86 and 16.6 mg/g for ZC and ZM, respectively. Removal efficiencies between 80 and 85% were attained.

REMOVAL OF CONGO RED FROM AQUEOUS SOLUTION BY ZEOLITES FROM COAL ASHES: KINETIC STUDY AND EQUILIBRIUM ISOTHERMS ANALYSES