Valorization of fly ash as zeolite by hydrothermal process for dyes adsorption

Abstract Valorization of fly ash as zeolite is one sustainable ways to reduce environmental burden. In this paper, was prepared from by hydrothermal process and applied dyes adsorbent. process, reacted with 5 N NaOH solution using solid/liquid ratio 1/30 for 15 hours at temperature 85°C. Characterization products consisted X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, scanning electron microscope (SEM) analysis. The results indicated the formation Na-X higher area compared raw ash. obtained Eriochrome Black-T (EBT) dye Adsorption conducted in batch variations time initial concentration. adsorption efficiency would increase increasing time, but after 90 minutes be relatively constant. concentration, lower efficiency. Furthermore, study kinetics model isotherm that had been carried out showed EBT tended follow pseudo-second order Freundlich model.