Modeling of single and binary adsorption of lead and cadmium ions onto modified olive pomace
Makaleler > Tam Makale · 2019
Yazarlar: Onur Uzunkavak, Maria Silvina Patterer, Franco Medici, Günseli ÖZDEMİR
Desalination and Water Treatment, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2019, cilt 162, ss 278-289
Özet
ABSTRACT This study deals with the evaluation of the single and binary removal of Pb 2+ and Cd 2+ from aqueous solutions using HNO 3 modified olive pomace (N-OP). For the specific binary adsorption behavior, a renovative isotherm model was developed based on the additivity of the single adsorption contributions of Pb 2+ and Cd 2+ calculated from the binary data. The effect of the initial metal ion concentration, pH, ionic strength, and temperature on the adsorption of the single Pb 2+ and Cd 2+ , and their binary adsorption were investigated using batch experiments at the optimum conditions. The N-OP displayed maximum adsorption capacities of 64 mg g –1 for Pb 2+ and 20.5 mg g –1 for Cd 2+ from the single metal ion solutions using 1.0 g L –1 N-OP. The results were best fitted with the Langmuir model for Pb 2+ and the Radke–Prausnitz model for Cd 2+ adsorption at 25°C. The reusability of the N-OP was confirmed with desorption studies. The thermodynamic study revealed that the adsorption of Pb 2+ was exothermic and that of Cd 2+ was an endothermic process. The existence of Cd 2+ in a binary solution increased the Pb 2+ removal while that of Pb 2+ reduced the Cd 2+ removal with N-OP. This behavior may contribute to a selective removal of the heavy metal ions from their mixture.