Kinetics and thermodynamics modeling of Nd(Ⅲ) removal from aqueous solution using modified Amberlite XAD7

作者：Petru Negrea; ANDreea Gabor; Corneliu Mircea Davidescu; Mihaela Ciopec^*; Adina Negrea^*; Narcis Duteanu

来源：Journal of Rare Earths, 2020, 38(03): 306-314.

New adso rbent material was obtained by modification of commercial Amberlite XAD7 with thiourea that represents a non-toxic,cheap and environmentally friendly extractant.Prepared adsorbent was used for removal of neodymium ions from aqueous solutions.Thiourea modified Amberlite involved in this study shows good adsorption capacities(74.3 mg/g) and excellent efficiency during Nd removal process.In order to elucidate the mechanism of the Nd adsorption process kinetic,thermodynamic and equilibrium studies were performed,establishing this way which kinetic model better describes the Nd adsorption process.Moreover the thermodynamic studies prove that the Nd adsorption on thiourea modified Amberlite XAD7 is an endothermic and spontaneous process.