Isotherm and Kinetic Studies of Co (II) and Ni (II) Ions Removal from Simulated Wastewater by Spines of Bombaxbuonopozense.

Abstract

Adsorption studies of heavy metals (Co and Ni) from aqueous solution were performed using spines of Bombax buonopozense (raw), carbon prepared from Bombax buonopozense (AC1) and activated carbon prepared from modification of spines of cotton silk tree (AC2). Batch experiments were performed as function of contact time, initial concentration, pH and dosage. The respective optimum contact times required for adsorption Co and Ni were 90 min. The experimental equilibrium adsorption data were tested for the Freundlich and Langmuir equations. The adsorption kinetic data were treated with pseudo -first-order and the pseudo-second-order. the results indicated that second-order model better described the adsorption kinetic data. This could be as are result of ion exchange involved in the removal of the metal ions by the adsorbents. Therefore, sorption using spines of Bombax buonopozense has been adjudged as one of the best tools for replacing conventional methods for the removal of heavy metals because of its cost effectiveness, efficiency and availability of the materials used as biosorbents