Adaptation of bagasse fly ash, a sugar industry solid waste into zeolitic material for the uptake of phenol



Bagasse fly ash (BFA), a sugar industry waste was converted into zeolitic material (ZBFA) by alkaline hydrothermal treatment. The virgin BFA and synthesized ZBFA were characterized by various instrumental techniques viz. XRF, FTIR, PXRD. Zeolitazation achieved showed that zeolite-P was the dominant constituent of ZBFA. The physico-chemical properties of BFA and ZBFA were compared. Morphology of the sorbents was examined by SEM. The kinetic and thermodynamic data of sorbents were evaluated by Coats and Redfern method using Thermal Analysis (TGA, DTG, and DTA) data. The point of zero charge value of the sorbents determined by mass titration method showed higher value for ZBFA (pH 8.62) as compared with BFA (pH 5.80). The specific surface area of ZBFA increased to 505 m2/g (BFA = 440 m2/g). Sorption capacities of BFA and ZBFA were examined by sorption of phenol at various operational parameters. The equilibrium data were analyzed by various adsorption isotherms viz. Langmuir, Freundlich, Temkin, and D-R. Langmuir isotherm best fits the experimental data for ZBFA (qm = 35.43 mg/g) and BFA (qm = 16.33 mg/g). The isotherms study indicates that the sorption capacity of synthetic zeolitic (ZBFA) products is significantly increased after alkaline hydrothermal treatment. © 2010 American Institute of Chemical Engineers Environ Prog, 2011