Arsenic removal using bagasse fly ash-iron coated and sponge iron char

The present work reports the adsorption capacity of bagasse fly ash-iron coated (BFA-IC) and sponge iron char (SIC) for arsenic removal. Different kinetic models were used to the kinetic data amongst which pseudo-second order model was best fitted. Batch equilibrium adsorption was carried out to determine the adsorption capacity of the BFA-IC and SIC. The adsorption data were fitted to the Langmuir, Freundlich, Tempkin and Redlich–Petersion isotherm adsorption model. The maximum adsorption capacity (qm) of both BFA-IC and SIC were also determined. The maximum uptake capacity (qm) of BFA-IC and SIC for As(III) was 39.53 and 27.85 μg/g, respectively, and for As(V) was only 25.82 and 28.58 μg/g, respectively. The surface area of the BFA-IC and SIC was determined to be 168 and 78.63 m2/g, respectively, using BET method. The zero point charge was determined using solid addition method. In the present work, it is found that the after substantial chemical modification of BFA and SIC have potentials to be used as low cost adsorbents for arsenic removal from waste water.