| Abstract Submission No. | ABS-3.1-0223 |
| Title of Abstract | Surface modified zirconium oxide-magnetic nanocomposites infused alginate beads for the recovery of Y and Sc from red mud leachates in groundwater |
| Authors | ALAGARSAMY G*, NITHIYA P, R SIVASUBRAMANIAN , R SELVAKUMAR |
| Organisation | PSG INSTITUTE OF ADVANCED STUDIES |
| Address | PSG INSTITUTE OF ADVANCED STUDIES Coimbatore, Tamil Nadu, India Pincode: 641004 E-mail: asg@psgias.ac.in |
| Country | India |
| Presentation | Oral |
| Abstract | The transition towards clean energy is leading to an increased dependence on secondary sources for critical metal production, particularly from waste streams. Globally, red mud poses a significant environmental challenge in the alumina industry, but also represents an interesting source for critical metals such as yttrium (Y) (60-150 mg/kg) and scandium (Sc) (60-120 mg/kg). In the present study, varying compositions of surface modified zirconium oxide and magnetic nanoparticles infused porous alginate beads, and their recovery efficiency towards Y and Sc were studied in batch and column mode. The prepared nanoparticles and beads were characterized using suitable techniques like X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM). Y and Sc adsorptions onto beads were confirmed using an inductively coupled plasma-optical emission spectrophotometer (ICP-OES) and X-ray photoelectron spectrophotometer (XPS). From the batch experiments, the effect of pH, time, adsorbent and adsorbate dosage, along with the maximum adsorption capacity (Q0) was calculated. The experimental data have been fitted well with the pseudo second order kinetic and the Freundlich isotherm models. Further, the BDST model was applied to calculate the adsorption capacity (N0) of the fixed-bed column. The selectivity and interference study was carried out on the red mud leachate sample, and the results revealed that the beads showed high selectivity towards Y (43.2%) and Sc (35.17%), respectively. This adsorption study revealed that the developed alginate beads are promising materials that are cost-effective, non-toxic, biodegradable, eco-friendly, and highly efficient towards the recovery of Y and Sc from red mud. |
| Keywords | red mud, yttrium, scandium, porous alginate bead, selective adsorption. |