Separation of Nd(III) from Nd(III)/Co(II) Mixture Using Poly (Carboxymethyl Cellulose.starch-g-acrylic Acid/Al2O3) Nanocomposite

Abstract

The separation of neodymium from the Nd(III)/Co(II) mixture is crucial for producing high-purity neodymium, which is essential in industries like electronics. A new nanocomposite, Poly(carboxymethyl cellulose.starch-g-acrylic acid/Al₂O₃), P(CMC-St-g-AA/Al₂O₃), was prepared and applied for the sorption and separation of Nd(III) from the Nd(III)/Co(II) mixture. This nanocomposite, synthesized with γ-irradiation of ⁶⁰Co at 35 kGy, was extensively characterized using SEM, FTIR spectroscopy, and TGA-DTA. Parameters affecting neodymium separation were studied, revealing optimal conditions. Kinetic experiments showed agreement with a pseudo-n^th-order kinetic model. Isothermal sorption studies indicated multilayer adsorption, with Co(II) and Nd(III) adsorption capacities of 2.781 mg/g and 8.825 mg/g, respectively, at pH 3.0. Thermodynamic analysis confirmed spontaneous and endothermic sorption. Separation factor values peaked at pH 3.0, shaking for 120 min, 0.1 adsorbent dosage, and ambient temperature, highlighting effective Nd-Co separation under these conditions. In conclusion, the comprehensive analysis and successful application of P(CMC-St-g-AA/Al₂O₃) nanocomposite underscore its potential as a highly efficient and selective sorbent for neodymium separation.