| Title |
Biosynthesis of conductive and paramagnetic value-added rare earth graphitic materials |
| ID_Doc |
26945 |
| Authors |
Upadhyay, A; Zhu, L; Ren, F; Tehrani, R |
| Title |
Biosynthesis of conductive and paramagnetic value-added rare earth graphitic materials |
| Year |
2023 |
| Published |
|
| DOI |
10.1016/j.resconrec.2022.106737 |
| Abstract |
Sustainable circularity of rare earth elements (REEs) can be achieved by phytoextraction of REEs from waste and remanufacturing them as value-added products. We have demonstrated erbium, europium, gadolinium, neo-dymium, and yttrium uptake using Eleocharis acicularis. The highest accumulation was observed for neodymium and gadolinium (56 and 55 mg/g dry weight), whereas yttrium (39 mg/g dw) had the lowest bioaccumulation from a feed solution of 300 mg/L over 10 days. The REE-accumulated biomass was used as raw material for graphitization at 1200 degrees C. A higher degree of graphitization was observed in REE-graphitic material (GM) (0.91-0.97) and the lowest was observed in the non-exposed control biomass-GM (0.81), indicating the catalytic action of the REEs. XRD and SAED diffractograms showed the multilayer polycrystalline nature of the GMs, and Raman spectra demonstrated the presence of sp2 hybridization. Furthermore, Gd-GM had higher conductivity (1.09 x 104 S/m) than the commercial graphite (8.21 x 103 S/m) at 30 MPa applied pressure. The REE-GMs showed high capacitance (measured at 20-300 kHz) and an optical band gap of less than 1.11 eV. Addition-ally, Gd-GM showed significant paramagnetic properties, making it a potential precursor for sustainable MRI contrast agent synthesis. |
| Author Keywords |
Circular economy; Lanthanide-graphitic material; Metal-biomaterial; Resource substitution; REE phytoextraction; MRI precursor |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000885456600002 |
| WoS Category |
Engineering, Environmental; Environmental Sciences |
| Research Area |
Engineering; Environmental Sciences & Ecology |
| PDF |
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