Keywords: hexavalent chromium, andisols, adsorption isotherms, acid treatment, chromium(IV) removal, water pollution
Utilisation of Andisols as possible low-cost adsorbent to remove Cr (VI) from aqueous solution
The potential of using Andisols to remove Cr (VI) from aqueous solution was evaluated by batch and column experiments. The results showed that the A-horizons (Isarog: 63%; Mandalagan: 42%) of the soils have lower adsorption capacity compared to B-horizons (Isarog: 93%; Mandalagan: 66%) using a dose of 20 g/L and Cr (VI) concentration of 10 mg/L. The adsorption capacity of B-horizons using column experiments were also found to retain more Cr (VI) than batch technique. Hence, the B-horizon of the studied Andisols can be used as an effective adsorbent for Cr (VI) removal from contaminated water systems.