Modeling of single and binary adsorption of lead and cadmium ions onto modified olive pomace
Küçük Resim Yok
Tarih
2019
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Desalination Publ
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This study deals with the evaluation of the single and binary removal of Pb2+ and Cd2+ from aqueous solutions using HNO3 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 Pb2+ and Cd2+ calculated from the binary data. The effect of the initial metal ion concentration, pH, ionic strength, and temperature on the adsorption of the single Pb2+ and Cd2+, 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 Pb2+ and 20.5 mg g(-1) for Cd2+ from the single metal ion solutions using 1.0 g L-1 N-OP. The results were best fitted with the Langmuir model for Pb2+ and the Radke-Prausnitz model for Cd2+ adsorption at 25 degrees C. The reusability of the N-OP was confirmed with desorption studies. The thermodynamic study revealed that the adsorption of Pb2+ was exothermic and that of Cd2+ was an endothermic process. The existence of Cd2+ in a binary solution increased the Pb2+ removal while that of Pb2+ reduced the Cd2+ removal with N-OP. This behavior may contribute to a selective removal of the heavy metal ions from their mixture.
Açıklama
Anahtar Kelimeler
Biosorption, Olive pomace, Lead, Cadmium, Binary adsorption
Kaynak
Desalination and Water Treatment
WoS Q Değeri
Q4
Scopus Q Değeri
Q3
Cilt
162
