报告摘要：Rare Earth Elements (REEs) have unique physicochemical properties that make them essential elements in many high-tech components, such as electric vehicle, power generator, MRI, screen display, hydride batteries and energy storage. Traditional separation methods like centrifugation and filtration are usually labor-consumptive, uneconomical and environmental pollutant. Magnetic separation nanotechnology developed in our lab is an upcoming technique for REE recycling. Magnetic nanosorbents exhibit special superiority due to convenient separation by an external magnetic field. Advantages of magnetic nanosorbents are low inventory utilization of nanosorbents, enhanced sorption efficiency, high selectivity, and low production of secondary waste. This talk presents the study on our lab-made magnetic nanosorbents – double coated magnetic nanoparticles (dMNP) conjugated with diethylene triamine pentaacetic acid (DTPA) and their potential to be used as effective sorbents to recycle trivalent lanthanides from aqueous solutions. The REE sorption results show that the magnetic nanosorbents possess a high stability, fast kinetics, and high sorption efficiency in harsh environments. The metal sorption on the nanosorbents is reversible so that the metal-loaded dMNP-DTPA can be effectively regenerated by the dilute acids. The nanosorbents can be reused for more than 15 sorption/desorption cycles, which helps to offset the synthesis cost and makes this technique cost-effective in REE recycling.
专家简历：Dr. Qiang is a professor of Physics and Environmental Science Program at the University of Idaho, US. He is the director of UI Nanophysics and Nanomaterial Research Lab. He is a Fellow, the Trustee and Chairman of Idaho Academy of Science and Engineering. He received his MS degree 1985 at the Harbin Institute of Technology and Chinese Academy of Space Technology, and Ph.D. degree in 1997 at the University of Freiburg, Germany. Dr. Qiang’s research focuses on nanomagnetism and magnetic nanomaterials. He has studied magnetic nanoparticles and nanocomposites for more than 30 years. His expertise includes: synthesis of monodispersive nanoclusters and nanocluster-assembled composites; characterization of magnetic and optical properties as well as transport properties by conductivity, optics, susceptibility and theoretical investigation. He applies magnetic nanomaterials in energy, environmental and biomedical science and nanotechnology. Presently Dr. Qiang’s research interests are a) Nano-nuclear technology and magnetic separation nanotechnology for used nuclear fuel recycling; b) High temperature ferromagnetism and giant magnetoresistance of semiconductor oxide nanomaterials; and c) Iron-based magnetic nanoparticles for cancer treatment and environmental remediation. He has published more than 110-refereed papers and 4 book chapters, more than 130 invited talks at US and international conferences, universities and institutions. He serves as editors for scientific journals like IEEE Mag. Letters, Nanomaterials… and served on national and international conference organizations and committees, including APS, MRS, CleanTech, NanoTech and IMC. He has organized and chaired many conferences and sessions such as INTERMAG, MMM, TMS, APS and NW-APS meetings.