BATCH ADSORPTION DYNAMICS AND EQUILIBRIUM STUDIES FOR THE REMOVAL OF LEAD (II) IONS FROM AQUEOUS SOLUTION USING ADSORPTION ACTIVE CARBON PREPARED FROM BARLEY CHAFF PLANT
Keywords:
commercial activated Carbon(CAC) and barley chaff plant (BCP), Lead(II) ions,adsorption isotherms, kineticAbstract
Studies on batch adsorption dynamics and equilibrium for the removal of lead (II) ions from aqueous solution using indigenously prepared barley chaff plant (BCP) and commercial activated carbons (CAC) have been carried out with an aim to obtain data for treating effluents from metal processing and metal finishing industries. Effect of various process parameters has been investigated by following the batch adsorption technique at 30 +1°C. Percentage removal of lead(II) ions increased with the decrease in initial concentration and increased with increase in contact time and dose of adsorbent. Amount of lead (II) ions adsorbed increases with the decrease in particle size of BCP. As initial pH of the slurry increased, the percentage removal increased, reached a maximum and the final solution pH after adsorption decreases. Adsorption data were modeled with the Freundlich and Langmuir isotherms,(1) Kinetics of adsorption is observed to be first order with intra particle diffusion as one of the rate determining steps. Removal of lead (II) ions by barley chaff plant BCP is found to be favorable and hence BCP could be employed as an alternative adsorbent to commercial activated carbon (CAC) for effluent treatment, especially for the removal of lead (II) ions.
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