Cantuaria M., de Almeida Neto A., Nascimento E., dos Santos O., Vieira M., 2014, Removal of Silver Ions on Calcined Verde-lodo Bentonite Clay: Equilibrium Study, Chemical Engineering Transactions, 39, 667-672.
The removal of heavy metals from industrial wastewater has been discussed in several research studies due its environmental and economic importance. Among the used methods, adsorption on bentonite clays has demonstrated a high removal potential for several metal´s ions. In this study, the component studied is silver since it is a valuable material commonly used in many industrial processes. The equilibrium study of silver adsorption onto calcined Verde-lodo bentonite was conducted in batch. Adsorption experiments were performed to study the adsorption capacity of Verde-lodo clay. Equilibrium isotherms were obtained in four different temperatures (273 K, 293 K, 313 K and 333 K) and fitted to Langmuir, Freundlich and D-R models towards to evaluate adsorption and thermodynamic parameters. Different eluents were tested to verify their desorption capacity seeking the regeneration of the adsorbent. Then, a second adsorption cycle was performed in order to verify if the adsorbent has maintained its adsorption capacity.