Column adsorption studies on nickel and cobalt removal from aqueous solution using native and biochar form of Tectona grandis

Abstract

Continuous column adsorption studies were performed in this work using native and biochar form of Tectona grandis leaves to remove Ni (II) and Co (II) ions from aqueous solution. Column performance was evaluated by varying the bed height, flow rate and inlet metal ion concentration. Further, column adsorption models including Adam‐Bohart, Thomas, and Yoon‐Nelson were applied to evaluate different column parameters. Thomas model was found to be in good agreement with higher R2 and closer experimental and theoretical uptake capacity values. Interpretation of the breakthrough curves indicated that the exhaustion time of column extended with increasing bed height and decreasing flow rate and metal ion concentration. Column desorption studies using hydrochloric acid signified the potential of the adsorbents to effectively desorb the adsorbed metal ions. Thus, evaluation of the adsorption potential of Tectona grandis in this study revealed its adequate inherent potential with high adsorption capacities to remove nickel and cobalt ions from aqueous solution evidencing its practical applicability as adsorbent. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1030–1038, 2017