报告人：强游 教授（Environmental Science and Department of Physics, University of Idaho, USA）
时间：05月25日（周一）下午14:00
地点：医学楼401号楼一楼会议室
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医学部欧洲杯官网
放射医学及交叉学科研究院
摘要：In order to meet future energy needs without polluting the environment by ejecting carbon dioxide, nuclear energy is one of the best sources of clean energy. One major concern is the disposal of the used nuclear fuel, any process for its disposal needs to have a minimal impact on the environment. Globally plutonium and uranium recovery for MOX fuel is performed using the PUREX process. However, this comes with certain disadvantages such as the requirement for large quantities of separation reagents and the generation of significant volumes of secondary waste that might increase the threat of proliferation. With long term storage of used nuclear fuel, there is potential for contaminating ground water due to the performance of interim and long term geologic storage containers. Without the recycle of the minor actinides (Np, Am, Cm), no significant reduction in the radiological hazard of the waste is obtained. Novel magnetic nanosorbents-surface functionalized magnetic nanoparticles conjugated with specific metal chelators-has been developed for separation of metal ions from aqueous systems, which offers a simple, fast, effective, and environmentally benign technique in spent nuclear separation. The unique properties of magnetic nanoparticles (MNPs), such as their extremely small size and high surface area to volume ratio, provide better kinetics for the adsorption of metal ions from aqueous solutions. The high magnetic susceptibility of MNPs aids in an efficient separation of particles from waste solution. In this work, we demonstrated the separation of minor actinides using complex conjugates of MNPs with DTPA chelator. The uptake behaviour of Am(III), Pu(IV), U(VI), and Np(V) from 0.1M NaNO3 solution was determined. The sorption results show the strong affinity of DTPA towards Am(III) and Pu(IV) by extracting 97% and 80% of actinides, respectively [1-3]. Magnetic separation nanotechnology proves an effective method for used nuclear fuel recycling as it is a simple, versatile, compact, and cost efficient process that minimizes secondary waste and improves storage performance.
代表性论文：
[1] A. K. Johnson, J. Kaczor, H. Han, M. Kaur, G. Tian, L. Rao, Y. Qiang, and A. J. Paszczynski, Journal of Nanoparticle Research 13 (2011) 4881–4895.
[2] M. Kaur, A. Johnson, G. Tian, L. Rao, A. J. Paszczynski, and Y. Qiang, “Separation Nanotechnology of Diethylene-triaminepentaacetic Acid Bonded Magnetic Nanoparticles for Spent Nuclear Fuel,” Nano Energy, 2 (2013) 124-132.
[3] M. Kaur, H. Zhang, L. Martin, T. Todd, and Y. Qiang, “Conjugates of Magnetic Nanoparticle - Actinide Specific Chelator for Radioactive Waste Separation,” Enviornmental Science & Technology, 2013, 47, 11942-11959.
个人简介：Dr. You Qiang is a professor of physics and adjunct professor in the Environmental Science Program at the University of Idaho, US. He was the chairman of Idaho Academy of Science (2012-2014). He received his MS degree 1985 at the Harbin Institute of Technology and Chinese Academy of Space Technology, China, and a Ph.D. degree 1997 at the University of Freiburg, Germany. He was a research faculty at the University of Nebraska-Lincoln from 1999 to 2002. Dr. Qiang’s research focuses on magnetism 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 for spintronics; 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 110 invited talks at national and international conferences, universities and institutions, Editors for several magnetic and nano-research journals like IEEE Mag. Letters, Nano-materials …, and served on national and international conference organizations and committees, including MRS, CleanTech, NanoTech and IMC. He organized and chaired conferences and sessions for INTERMAG, MMM, APS and NW-APS meetings.