Adsorption of nickel (II) by low cost Hopea parviflora Saw dust

This work has been carried out to check the ability of Hopea parviflora saw dust, to remove Ni(II) ions from aqueous solution. The effect of pH, contact time, and initial adsorbent dosage on the metal ion adsorption capacity were investigated. The obtained results indicate that the adsorption amount of heavy metal ions increased with the increase of shaking time, adsorbent dose and pH of the media, which revealed that the optimum pH and adsorbent dosage for Ni(II) was found to be pH 6 and 1.00 g. The optimum contact time for nickel metal ion was observed to be around 60 minutes. The experimental results were examined using the Langmuir and Freundlich isotherms to obtain the appropriate model. The observed results indicate that the Langmuir equation was the best model for the adsorption of Ni(II) from aqueous solution. The results of the kinetic investigations indicated that the pseudo second order model fitted better the adsorption kinetics of Ni on Hopea parviflora. From the above results it was concluded that the Hopea parviflora saw dust, carbon found to be low cost efficient adsorbent Nickel (II) under optimum conditions.